2026-04-05T10:56:19Z https://journal.uir.ac.id/index.php/JGEET/oai

oai:journal.uir.ac.id:article/2274 2021-11-22T02:24:26Z JGEET:ART

Resistivity Data Modeling for Subsurface Volcanostratigraphy Construction of Cibadak Sub-Watershed, Bogor, West Java, Indonesia. Alfadli, Muhammad Kurniawan Mardiana, Undang Natasia, Nanda Mohammad, Febriwan Mutaqin, Deden Zaenudin Resistivity Volcanostratigraphy Modeling Mt.Salak Geostatistic Parameters Correlation Geology Modeling Volcanostratigraphy In Mt. Salak, there are six volcanic facies divided by eruption time seen from geomorphology data analysis and to identified the subsurface layer DC Resistivity method is applied. Beside resistivity, geostatistical parameters also influence the result model interpretation, so for obtain best model correlation parameters such as tilting, surfacing, variogram, grid method, and logarithmic distribution is applied. Using 18 points of acquisition data subsurface model is produce and then section model made to describe vertical resistivity distribution then correlated with facies lithology model. Based on that, produce three facies resistivity type namely: 0 – 100 Ohm.m (Low Resistivity Value) Interpreted as pyroclastic material composed as tuff and breccia that lies under lava. 100 – 300 Ohm.m (Medium Resistivity Value) Interpreted as breccia lithology type. Harder that pyroclastic material due to by this product is avalanches of lava. And >300 Ohm.m (High Resistivity Value) Interpreted as lava lithology that lies at high elevation and the hardest lithology in this area. From the model, pyroclastic layer that is modeled found at low elevation and based on the direction it described as oldest facies layer, but at the bottom of this layer lies high resistivity value that unknown product. It can be Mt. Pangrango product due to at low elevation predicted as combine area product from product of Mt. Salak and Pangrango. High resistivity value show lava lithology and lava facies located in high elevation and medium resistivity describe breccia lithology as avalanche product of lava (youngest pyroclastic facies) and found at 500 – 100 meters msl. UIR PRESS 2021-06-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/2274 10.25299/jgeet.2021.6.2.2274 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 74 - 80 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/2274/3269 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/2311 2024-12-27T03:03:12Z JGEET:ART

Cost-Efficient Digital Elevation Model (DEM) Acquisition on Flume Tank Morphodynamic Observation Prasojo, Octria Adi Aufar, Adlirrahman Syahputra, Reza flume tank digital elevation model laser distance meter quantitative sedimentology Digital Elevation Model (DEM) is well known for providing solutions to the theoretical and application-related problems around geosciences. The use of DEM in flume tank experiment is getting more common nowadays. Flume tank itself is built to simulate the landscape and stratigraphy at laboratory scale. This physical experiment may have tremendous impacts on understanding the sedimentation process in a laboratory-scaled experiment. Normally, the morphodynamic behaviour of a laboratory-scaled deposit in the flume tank experiment would be observed through its digital elevation model. In this paper, a novel method in constructing cost-efficient digital elevation model was presented. By using this inexpensive tool to create a digital elevation model in a flume tank experiment setup, some challenges and benefits will follow this method. Some challenges including tool’s resolution and time consuming could be diminished in the near future by creating automated motor system to move the laser distance meter sequentially. Automated and integrated system from the LDM to the processing software could also reduce the time consumption. In the other hand, some benefits including financial benefit, reliability in a sedimentary structure scale, and also the practicality to be applied in any flume tank system available in Indonesia. Nevertheless, this method had been tested and some reliable results from the previous studies in Quantitative Sedimentology Laboratory, Universitas Indonesia was presented in this paper. Hopefully, some major improvements could be done to get more accurate and detail digital elevation model in the near future. UIR PRESS 2024-12-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/2311 10.25299/jgeet.2024.9.04.2311 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024); 484 - 488 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/2311/7408 Copyright (c) 2024 Journal of Geoscience, Engineering, Environment, and Technology http://creativecommons.org/licenses/by-sa/4.0

oai:journal.uir.ac.id:article/2874 2022-11-08T18:18:55Z JGEET:ART

Geosite Assessments at the Southern Part of Karangbolong Dome: New Insight to Geotourism Potential in Kebumen, Central Java, Indonesia Fadlin Waluyo, Gentur Iwan, Yohanes Ariyanti, Nita Ajeng Nurwantari, Nanda Qualitative assessment geodiversity geotourism Kebumen Geotourism petrology volcanology Karangbolong is a morphological dome in Kebumen area, that has a high geological diversity and have a lot of tourism potential, but has not been developed optimally as a geotourism potential based on conservative and educative aspects, especially the existence of ancient volcano of Menganti the quite interesting from a geological point of view, so in this case an inventory of a geological diversity is required. This study aims to understand the geological conditions and conduct an assessment of the feasibility of geodiversity in ancient volcano complex of Menganti. The methodology for this research is a direct observation in the field based on the surface geological mapping, rock sampling for petrology study of rocks for supporting the quantitative assessment of genocide in the research area. The research area has 2 (two) landscape models, ie,ex-volcanic landscape, in this case occupying 95% of the research area and then the karst landscape, occupying 5% of the research area. Stratigraphy of the research area can be divided into 5 units from old to young, that is basaltic lava of Menganti, the pyroclastic flow of Menganti which is interfingering with andesitic lava of Karangduwur, andesite-basalt intrusion unit, and limestone of Agropeni. Based on field investigation, the research area has 27 geosite objects that can be developed as geotourism potential, covering 3 geomorphological sites, 7 lithology sites, 9 cave karst sites, 5 beach sites, and 2 waterfall sites. Based on the results of quantitative assessment of geosites in the research area with accessibility, state of preservation, scientific wort, and educational significance parameters, the research area has a geodiversity index from 19 until 24, in this case, the research area has good until very good grade to be developed as a geotourism potential base on educative and conservative, in order to improve the economic value of local communities.   Keywords: Qualitative assessment, geodiversity, geotourism, paleo-volcano, Kebumen. UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/2874 10.25299/jgeet.2020.5.1.2874 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020; 8 - 18 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/2874/2414 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/2934 2022-01-12T20:33:15Z JGEET:ART

A Geophysical Survey with Magnetic Method for Interpretation of Iron Ore Deposits in the Eastern Nusawungu Coastal, Cilacap Regency, Central Java, Indonesia Sehah, Muhammad Raharjo, Sukmaji Anom Risyad, Azmi geophysical survey magnetic method iron ore Eastern Nusawungu Cilacap Regency Geophysical Survey geology Geophysical survey with magnetic method to interpret the iron ore deposits in the Eastern Nusawungu Coastal, Cilacap Regency, Central Java, Indonesia was carried out during six month, i.e. March –August 2017, covering the area in the geographical position of 109.3462° – 109.3718° E and 7.6958° – 7.7098° S. This survey has produced total magnetic field strength data at each measuring point in the research area. The magnetic field strength data which have been obtained, then be processed, corrected, and mapped so that the local magnetic anomaly contour map can be obtained. The local magnetic anomaly contour map shows the distribution of magnetic anomalous sources in the subsurface of research area. The 2D-modeling of magnetic anomalies data has been carried out along the AB trajectory extending on the local magnetic anomaly contour map from the position of A(109.3463°E and 7.7023°S) to B (109.3688°E and 7.7053°S), so that some subsurface anomalous objects is obtained. The modelling results of magnetic anomalies data show that the research area is estimated to have the potential of iron ore deposits. The subsurface rocks deposits containing iron ore are estimated to be located below the AB trajectory with a length about of 164.85 meters, a depth ranging of 1.709 – 31.909 meters, and a magnetic susceptibility value of 0.0122 cgs unit. These rocks are interpreted as sand deposits which coexists with silt and clay containing iron ore grains from the alluvium formation. Further, iron ore is also estimated to be present in the rocks deposits below the AB trajectory which have a depth of 24.405 – 49.809 meters and 3.989 – 11.111 meters, with the magnetic susceptibility values of 0.0093 and 0.0073 cgs units. UIR PRESS 2020-05-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/2934 10.25299/jgeet.2020.5.1.2934 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020; 37 - 44 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/2934/2425 Geophysical Survey uses magnetic methods to determine the potential and distribution of iron ore Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3089 2022-01-18T01:25:56Z JGEET:ART

Rock Physics Formula and RMS Stacking Velocity Calculation to Assist Acoustic Impedance Inversion that Constrain Well Data Handoyo Erlangga, Mochammad Puput Young, Paul Acoustic impedance rock physics stacking velocity wellog Geosains This research ilustrate the generation of acoustic impedance inversion in the absence of well log using stacking velocity input in Salawati Basin, Papua, Indonesia using data obtained from seismic lines and stacking velocity section. Initial acoustic impedance modelswere first before the inversion process and were created by spreading the value of well log data to the all seismic CDP. The calculated acoustic impedance logs from standard sonic and density logs were used to build the initial model of acoustic impedance.First, the stacking velocities was first interpolated on a grid that has the same size as the seismic data using by means of Polynomial algorithm. This was closely followed by the conversion of the stacking velocities to interval velocities using Dix’s equation. The matrix densities were estimated by simple rock physics approach i.e. Gardner’s equation as a velocity function. The initial model of acoustic impedance was calculated by multiplying the densities section and interval velocities section. The resulting initial model of acoustic impedance was inverted to obtain the best of acoustic impedance section based on reflectivity. UIR PRESS 2020-06-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3089 10.25299/jgeet.2020.5.2.3089 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 56 - 58 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/3089/2513 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3315 2021-11-22T02:24:02Z JGEET:ART

Shallow Aquifer Groundwater Facies At Multiple Landuse Sites In Manglayang Volcanic Area, Jatinangor And Surroundings, Indonesia Suganda, Bombom Rachmat Yusuf, Wahyudi Barkah, Mochamad Nursiyam Sunarie, Cecep Yandri Hadian, M. Sapari Dwi Volcanic aquifer Manglayang Mountain Landuse Groundwater Facies Hydrogeology Manglayang Mountain is generally composed by old and young volcanic materials. Older rocks are located around the northern part of mountain peak, in medial and distal parts. In the southern and southeastern parts composed by relatively young volcanic rocks starting from the proximal, medial to distal. These geologic conditions produce diverse aquifer systems. These differences in land use environments contribute to water quality conditions in local shallow aquifers. The research is therefore carried out in order to the effect of difference in land use environments on groundwater facies by dividing the area based on each land use. Land use in the research area is dominated by allotment of agricultural land, settlement, and industry. The study was conducted from the medial area to distal to the southern part of Manglayang Mountain, administratively including Sukasari, Jatinangor, and Rancaekek districts. To observe the groundwater conditions in the aquifer from the study area, physical and chemical parameters were tested. Chemical parameter test results were plotted using piper diagrams and Durov diagrams as a method that can illustrate the condition of groundwater facies. Physical characteristics of groundwater may reflect groundwater interactions with rocks. Measurable TDS concentrations of 48 - 299 mg / L and measured EC 100 - 1020 μmhos / cm, show different interaction conditions between groundwater with rocks or have received different material subsidies. Similarly, the occurrence of temperatures that vary considerably between air and water indicates the distance of groundwater sources with various water bodies. The groundwater facies that developed in the research area are generally dominated by Ca, HCO3 in the agricultural land use area, Mg, HCO3 in the settlement area, and in some Cl-facing evolving places in the industrial land use zones. In addition, there are also indications of mixing of anions and cations in groundwater samples in all three land use areas. This indicates that there has been a change in groundwater characteristics in some areas of land use utilization in the research area UIR PRESS 2021-07-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3315 10.25299/jgeet.2021.6.2.3315 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 120 - 126 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/3315/3372 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3705 2022-01-18T01:22:53Z JGEET:ART

Impacts of Population Density for Landuse Assessment in Cengkareng, West Jakarta, Indonesia: Landuse Assessment Putri, Ratih Fitria Abadi, Aji Wijaya Tastian, Naufal Fattah Landuse change Population density Settlement pattern Landuse Assessment Economic development in Jakarta has been influencing physical and social characteristics of urban area significantly. For recent years, burgeoning population growth occurs as a result of urban development and contributes to the landuse dynamics in a certain area. Cengkareng, is one of the most developed urban areas in Jakarta and has been experiencing such population and landuse dynamics. Its strategic location has turned this area becomen densely-populated. Increasing population density increase land demand, shapes the settlement pattern, and changes the landuse of the area. A study conducted in Cengkareng District has been done to describe how the population density impacts the landuse features for landuse assessment. The method implemented in this study combines quantitative and qualitative to process statistics and satellite imagery to produce data of population density, landuse change, and settlement pattern of the studied area. The study resulted that Cengkareng has experienced such significant landuse change which is dominantly converted into settlement and offices due to rising of population density. Nucleated settlement pattern has taken more area regarding to increased land need over land supply. It becomes serious problem for Cengkareng such aa slum settlements, flood problems, and land subsidence.   Keywords: Landuse change; Population density; Settlement pattern   UIR PRESS 2020-06-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article TEXT application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3705 10.25299/jgeet.2020.5.2.3705 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 45 - 55 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/3705/2512 JGEET MAP Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3791 2022-01-18T01:30:11Z JGEET:ART

Simultaneous Equation Model for Economic Calculation of Households of Independent Rubber Farmers in Mineral Land in Kampar Regency, Riau Province, Indonesia Heriyanto, Heriyanto Asrol Household Economy Dominant Factors Rubber Agricultural Rubber is a plantation crop which is mostly a source of community income in Kampar District. As a source of household income, rubber farming is managed by households independently. This study generally aims to design models and government policy strategies in the development of smallholder rubber plantations on land typology mineral land conditions on the economic decision making of rubber farmer households. Specifically, this study was conducted with the aim of analyzing the characteristics of independent smallholders and internal and external dominant factors that influence the allocation of working time, income and household expenses of rubber farmers. This research was conducted using a survey method located in Kampar District. The data used in this study consisted of primary data obtained using the interview method. Samples were taken by simple random sampling method with 60 rubber farmers. Descriptive analysis and Economic Decision Model of Rubber Farmer Households using the simultaneous equation model approach with the Two Stages Least Square (2SLS) analysis method were performed to answer the research objectives. The results showed that only internal factors of farm households are responsive to household economic decisions. There are no external factors included in the model that are responsive to the economic decisions of rubber farming households in Kuantan Singingi Regency regarding the aspects of production, working time allocation, income and expenditure of rubber farming households. From the aspect of production, no responsive internal or external factors were found, but the biggest effect was the number of productive rubber stems. From the aspect of work time allocation, internal factors that are responsive to influence are the total outpouring of farmer work, outpouring of farm family work in businesses and the workforce of farmer households. Furthermore, from the aspect of farmer's household income the responsive internal factors that influence it are the farmer's household income in the business. then what influences household expenditure is outflow of work in business, farmer education, wife education and total rubber farmer income. The policy implications of increasing rubber prices and outpouring of family work in the business have the most positive impact. While the increase in wages for workers outside the family has a negative impact on the household economy. UIR PRESS 2020-06-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3791 10.25299/jgeet.2020.5.2.3791 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 67 - 74 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/3791/2516 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3889 2022-01-12T20:24:33Z JGEET:ART

The Role of Decadal Kelvin Wave in the Western of Sumatra and Along the South Coast of Java using Frequency-Wavenumber 2D Spectral Analysis Khoirunnisa, Hanah Arif Rachman, Reno Sari Ningsih, Nining Syamsudin, Fadli decadal variability sea surface height anomaly Kelvin wave frequency-wavenumber 2D spectral analysis Oceanography This study observed the decadal variability of the sea surface height anomaly (SSHA) and identified the decadal Kelvin wave propagation along west-Sumatra and south coast of Java.  SSHA data and the vertical distribution of sea temperature for 64 years from HYCOM model resulted has already used in this research. There are several methods to identify the propagation of decadal Kelvin wave. These methods were low-pass filter by cut-off 1 and 8 years, visual analytic by using Hovmӧller diagram method, and frequency-wavenumber 2D spectral analysis to identify the Kelvin wave propagation and its period. The decadal Kelvin wave could be observed in west coast of Sumatra and along south coast of Java. There are three propagations of decadal Kelvin wave and their velocities were 1.029x10-3 m/s (1974 – 1976), 0.21 m/s (1985 – 1986), and 6.86x10-4 m/s for 1998 to 2001 trough west Sumatra and southern Java. The frequency-wavenumber 2D spectral analysis produced the improvement of Kelvin wave and it has the period of 7.25 years. The occurrence of the Kelvin wave has a relation to IOD index. The average of the IOD index when the decadal Kelvin wave was occurring must be the negative value, its value was a -0.21. UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3889 10.25299/jgeet.2020.5.1.3889 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020; 32 - 36 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/3889/2418 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3976 2021-11-22T02:23:55Z JGEET:ART

Groundwater Conservation Strategy Based on Water Balance at Muarabungo Groundwater Basin, Indonesia Barkah, Mochamad Nursiyam Hani, Fauziyah Suganda, Bombom Rachmat Iman, Munib Ikhwatun Sunarie, Cecep Yandri Hadian, Mohamad Sapari Dwi Groundwater Basin water balamce aquifer conservation Muarabungo Groundwater Basin Muarabungo Groundwater Basin,is locateed in Jambi and West Sumatra Province. Based on the four rainfall stations in Muaratebo, Dusun Rantau Pandan, Sungai Bengkal and Komplek Pengairan PU Station recorded in 2008 to 2011, the precipitation (ppt) in study area is 1799.09 mm/year. Value of evapotranspiration (Evpt) in the study area is equal to 1261.26 mm / year (70.1%). Groundwater Basin of Muarabungo has an infiltration debit of 2,516,791,750 m3 / year and run-off debit (Ro) of 798 042 638 m3 / year. Rock composer in the Muarabungo Groundwater Basin are dominated by Alluvium Deposition, Quaternary rocks, and also the surrounding areas are composed by igneous and metamorphic rocks. Aquifer with a good productvity can be found on Alluvium and sedimentary rocks such as tuff sandy, whereas region without exploitable groundwater are composed by igneous rocks and metamorphic rocks. Based on groundwater quality, Groundwater Basin is divided into 13 facies, namely Ca; Cl, ​​Mg; Cl, ​​Na + K, Cl, Ca; HCO3, Mg; HCO3, Na + K; HCO3, Ca; No. dominant type, Mg; Nodominan type, Na + K; No. dominant type, No. dominant type; Cl, ​​No. dominant type; HCO3, Nodominan type; SO4, and No. dominant type; No. dominant type. The result of water balance measurement in research area is used to show the areas for crisis and secure area. The water balance calculation and determining recharge and discharge areas are needed for developing conservation strategy. UIR PRESS 2021-09-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3976 10.25299/jgeet.2021.6.3.3976 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 127 - 130 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/3976/3522 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/3996 2022-01-12T20:09:42Z JGEET:ART

Hydrodynamics Features and Coastal Vulnerability of Sayung Sub-District, Demak, Central Java, Indonesia Ondara, Koko Dhiauddin, Ruzana Wisha, Ulung Jantama Rahmawan, Guntur Adhi hydrodynamics abrasion sedimentation coastal vulnerability Earth Science The Sayung sub-district is an abrasion area in Demak Regency that is mostly affected by sea level rise. The purpose of this research is to determine the features of hydrodynamics and coastal dynamics occurrence in the sub-district of Sayung. Collecting field data/information and modeling approach (tides, waves, currents, weather and coastline changes) have been done in Sayung, Demak. The wave height in the eastern coast is the highest. The significant wave height in 2004 was greater than March 2016 showing that in 2004 the wind energy transfers were larger than 2016. The refraction coefficient in 2016 for all directions was the greatest from the west at the depth of 8 m and the smallest one was identified in the south. The refraction coefficient in 2004 for any direction yielded the largest value in the southwest at the depth of 2 m and the smallest one was identified the south as well. During a cycle of tidal fluctuation, it occurs twice flood and ebb events. The maximum depth is 6.5 m located about 3.8 km from the coastline. The sediment thickness reached 564,886.39 m3. Coastline changes occurred in 2003 and started to gain sedimentation in 2015. Data and information produced can be useful as a basis for further developments to mitigate abrasion and to create policy-brief in managing coastline affected abrasion even though some improvement efforts have been made. UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/3996 10.25299/jgeet.2020.5.1.3996 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020; 25 - 31 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/3996/2416 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4064 2021-11-22T02:23:58Z JGEET:ART

A Tracer Streamline Practice for Re-Evaluation Waterflood Pattern to Introduce a Cyclic Water Injection Scheme Putra, Dike Fitriansyah Futur, Lazuardhy Vozika Umar, Mursyidah Tracer Test Cyclic Water Injection Water-flood Streamlines Reservoir Engineering Waterflood introduces in the oil field a couple of years ago. Several waterflood schemes have been implemented in the fields to get the best incremental oil, such as peripheral injection, pattern waterflood, and etcetera. Many waterflood schemes are not working properly to boost the oil recovery due to unpredicted and unexpected water tide array. Then, the tracer practice started to be used for getting a better picture of the transmissibility reservoir as well as the direction of water pathway. This practice honors the parameters, such pressure, water cut, GOR, and rates. The streamline modeling is used to map the tracer, and it concludes that the selection of location of the injector should be based on the highest oil recovery achieved. Subsequently, the cyclic water injection method is one alternative. Apparently, this approach yields a quantify incremental recovery.  This research utilizes the pressure different approach to figure out the route of water in the formation. The inter-well tracer technique in this modeling study is a tool to review communication between injectors and producers in the existing pattern. Many scenario should be tried to find the best options for the new pattern opportunities. In parallel, a innovative scheme of waterflood technique should be implemented too for escalating oil recovery. The stream pathway observes a new potential of the waterflood scheme. It is called "cyclic injection" scheme.  The novelty of this approach is the ability to solve the poor sweep efficiency due to improper pathway of water influx in the oil bearing". UIR PRESS 2021-08-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4064 10.25299/jgeet.2021.6.3.4064 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 127 - 136 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4064/3474 CWI Modeling Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4096 2022-01-12T19:19:07Z JGEET:ART

Geomorphological Assessment to Tract the Flow Evolution of Kali Putih, Srumbung District, Magelang Regency, Central Java, Indonesia Kusumayudha, Sari Bahagiarti Sanjaya, I Made Oki Murwanto, Helmy Raharjo, Sugeng Kali Putih flow evolution geomorphology lahar Geology Geomorphology Kali Putih (The White River) is located in Srumbung district, Magelang regency, Central Java, Indonesia. It is originated from the upper slope of Merapi volcano, flowing to the Southwest direction. Kali Putih belongs to one of the most channels where frequently flowed by lahar of Merapi volcano. Based on geomorphological and geological traces found at the surrounding of modern Kali Putih channel, this indicated that the flow of Kali Putih has undergone displacement several times. The position of ancient river valley in the past has changed into the modern river valley in the present time. The existence of ancient Kali Putih is exhibited by the presence of large dry valley morphology associated with volcanic blocks, gravels, and sand sized materials with various sorting, representing the characteristics of lahar and alluvial deposits. In the present time, the former river channels are currently used by local people for agricultural and fisheries land. UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4096 10.25299/jgeet.2020.5.1.4096 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020; 1-7 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/4096/2413 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4098 2022-01-18T01:38:32Z JGEET:ART

Effect of Porphyritic Andesite Intrusion on The Formation of Contact Metamorphism Aureole in Selo Gajah Hill Clastic Limestone, Bojonegoro Regency, East Java, Indonesia Winarno, Tri Marin, Jenian Wijaya Jati, Wisnu Bukit Selo Gajah hornfels contact metamorphism zone andesite intrusion Geology At Selo Gajah Hill, Jari Village, Gondang Sub-district, Bojonegoro Regency, East Java there are limestone intruded by porphyritic andesite. The intrusion produces contact metamorphisms in the wall rocks. It is very interesting to study the protolith  rock, facies of metamorphism and  the zonation of contact metamorphism aureole. This research uses field observation method and laboratory analysis i.e.  petrographic analysis. Field observation is conducted by doing geological mapping in the Bukit Selo Gajah area and rock sampling for  petrographic analysis.  Petrographic analysis aims to describe the texture of the rocks and the percentage of minerals, which will be used to determine the protolith rock, metamorphism facies and the determination of contact metamorphism zone. The lithology found in Mount Selo Gajah from oldest to youngest  are clastic limestone with intercalation of marl, marl with intercalation of sandstone, porphyritic andesite intrusions, hornfels, and pyroclastic breccia. Metamorphic rocks on Selo Gajah Hill is the product of contact metamorphism of carbonate rock which was intruded by porphyritic andesite intrusion. The metamorphism facies found in the research area are hornblende hornfels and pyroxene hornfels with the protolith rock is carbonate rocks. Metamorphism zone in Selo Gajah Hill is divided into two zones: The zone closest to the intrusion body is vesuvianite zone or idiocrase zone with a radius of 40-140 m from the outer part of the intrusion body and the monticellite zone with radius ranging from 25 to 75 m from the outside of the vesuvianite zone. UIR PRESS 2020-06-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4098 10.25299/jgeet.2020.5.2.4098 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 96 - 103 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4098/2529 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4112 2022-02-16T00:30:49Z JGEET:ART

The Origin of Geothermal Water Around Slamet Volcano - Paguyangan - Cipari, Central Java, Indonesia Iswahyudi, Sachrul Permanajati, Indra Setijadi, Rachmad Zaenurrohman, Januar Aziz Pamungkas, Muhamad Afirudin Slamet volcano Paguyangan Cipari Geothermal water Geothermal The existences of several hot springs between Slamet volcano, Paguyangan, and Cipari Districts raised questions regarding their origin. Several studies have been conducted related to the hydrothermal system at the location. Subsequent studies are needed to understand the hydrothermal system at the research site for the sustainability and conservation of geothermal natural resources. This research has reviewed several previous studies plus the latest information on the origin of hot spring water with the help of deuterium (2H) and 18O isotopes. This study used geochemical analysis of hot springs (geothermal) and local meteoric water to obtain information on isotope values. This was used for the interpretation of the origin of geothermal water. This study also used regional geological analysis methods for the interpretation of the mechanism for the emergence of these hot springs. The results of the analysis informed that the origin of hot water was local meteoric water. The geological structure was weak enough to allow water from the geothermal reservoir to reach the surface and meteoric water into the reservoir. UIR PRESS 2020-12-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4112 10.25299/jgeet.2020.5.4.4112 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 181 - 184 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4112/2922 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4113 2022-02-07T19:39:10Z JGEET:ART

Characteristics of Ultramafic Igneous Rock Ofiolite Complex in Asera District, North Konawe Regency Southeast Sulawesi Province, Indonesia Hasria Hasan, Erzam S. Deniyatno Salihin, L M Iradat Asdiwan Asera North Konawe Ultramafic petrography geochemistry Geology The research area is located in Asera District, North Konawe Regency, Southeast Sulawesi Province which has ultramafic rock lithology. The purpose of this study is to determine the characteristics of ultramafic igneous rocks using petrographic and geochemical analysis. Petrographic analysis aims to determine the types and abundance of minerals present so that rock types can be determined based on the classification of Travis (1955) and Streckeisen (1976). The geochemical analysis aims to determine the oxide/major element so that it can determine the type of magma based on the AFM classification according to Irvine and Baragar  (1971) and the origin of the magma / original rock formation environment based on Pearce (1977).  Petrographic analysis results showed that ultramafic rocks in the study area consisted of 2 types of rocks namely peridotite consisting of wherlit and lherzoite and serpentinite.  The results of geochemical analysis indicate that the type of magma in the study area is thoellitic series and the origin of the magma/rock formation environment comes from the expansion of the oceanic floor or mid oceanig ridge (MOR) which is ultramafic. UIR PRESS 2020-08-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4113 10.25299/jgeet.2020.5.3.4113 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 108 - 112 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4113/2648 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4127 2021-11-22T02:24:05Z JGEET:ART

3D Natural State Modeling of Mount Iyang-Argopuro Geothermal Area, East Java, Indonesia Asmorowati, Dewi Lukmana, Allen Haryanto Prasetyo, Rizqi Mahfudz Mount Iyang-Argopuro Natural State Reservoir Simulation TOUGH2 Geothermal Mount Iyang-Argopuro is one of the geothermal working areas in the East Java. Mount Iyang-Argopuro has the potential of 185 MWe of reserves and 110 MWe of resources.  It is estimated to have a liquid dominated reservoir with temperature up to 250-275 oC. An early 3D natural state numerical model of Mount Iyang-Argopuro Field is created using TOUGH2 simulator in order to identify the undisturbed condition of reservoir and resource assessment. Since Mount Iyang-Argopuro geothermal area is still in the exploration stage, the model created based on based on geological, geophysical, and geochemical data. The model has an area 14 km x 8.2 km and 9180 m in thickness. The model consists of 7410 of rectangular cell blocks with the roughest cell size is 1000 m x 1000 m and the finest is 200 m x 500 m. The model is verified by matching the model temperature and pressure profiles to the calculated geothermometer temperature and pressure, which shows good match enough. UIR PRESS 2021-06-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4127 10.25299/jgeet.2021.6.2.4127 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 113 - 119 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4127/3304 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4181 2022-02-07T19:47:41Z JGEET:ART

Evaluation Study Of Walkability Index In Central Business District (CBD) Area, Pekanbaru City Sofwan, Muhammad Tanjung, Mira Hafizhah walkable city CBD WAI IPEN Project Urban and Regional Planning Walkable cities emphasize cities with high walkability values, where walkability can be defined as the degree to which the environment can be pedestrian friendly. Walkable city is considered to be able to increase people's desire to walk so that it can make the environment more humanistic and can also help realize one of the objectives of sustainable transportation. The value of walkability can be viewed from the perspective of the urban form (macro level) of an area. The Central Business District (CBD)  Pekanbaru City walkability index assessment uses the WAI IPEN Project model that measures the form of the Urban Form. The walkability assessment process in the Pekanbaru Kota Sub-District Area (CBD) divides the study area into 6 grids. The analysis shows that there are 4 grids that have a negative walkability value. In the analysis of the walkability value pattern it can be seen that the area dominated by office activities has a lower walkability value compared to the area that has mixed land use. UIR PRESS 2020-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4181 10.25299/jgeet.2020.5.3.4181 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 155 - 163 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4181/2712 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4191 2022-01-18T01:34:22Z JGEET:ART

Shale Gas Potential In Jambi Sub-Basin, Indonesia: Insights From Geochemical and Geomechanical Studies Setyawan, Reddy Subroto, Edy Ariyono Sapiie, Benyamin Condronegoro, Randy Syam, Beiruny Gumai Formation Talangakar Formation source rock Young's modulus Poisson's ratio brittleness index Geology Geochemistry Geomechanics Jambi sub-basin, which is located in South Sumatra, Indonesia has enormous potential of shale gas play. Yet, detailed geological studies are rarely undertaken to understand this relatively new hydrocarbon play concept. This paper presents a combination of geochemical and geomechanical studies with the aim to better understand: (1) the maturity level of source rock; (2) the mechanical properties of shale; and (3) the quality of hydrocarbon source rock. This research began with determination of wells that penetrate the Talangakar and Gumai Formations that have shale in it. Source rock analysis was done by using TOC (total organic carbon), S1, S2, S3, Tmax, and Ro (vitrinite reflectance) data. Geomechanical evaluation was done by using XRD and well logs data. Brittleness index was obtained by using Jarvie et al. (2007) formula, based on the XRD data. S-wave and P-wave are used to calculate the rock strength, Young's modulus and Poisson's ratio with UCS-To methods.Source rock in the Geragai belongs to the of moderate-to-good category because it has more than 0.5% TOC and potentially forms gas because it has a type III kerogen. JTBS-2 well is the only well in the Geragai area which already mature and has been able to produce hydrocarbons, because it passed the oil and gas windows. Source rock in the Betara belongs to moderate-to-good category because it has more than 0.5% TOC potentially forms gas because it has a type III kerogen. Most formations in the Betara are not yet mature based on the value of Ro and Tmax. In wells that have not reached the oil window nor gas windows, the prediction line drawn on the Petroleum Source Rock Summary chart, estimated that they would pass the gas window at Lower Talangakar Formation or Lahat Formation at depth of more than 8000 feet. The results of XRD analysis showed that the Betara had a high brittleness index with an average of 0.809. Talangakar Formation has a higher rock strength values than Gumai Formation, both in Betara high and Geragai deep. The principle that say the rocks which have high TOC values will have a high value of BI can be proven in the study area, the rocks that have high Ro will have a high value of BI, cannot be identified in the study area. With sufficient high value of rock strength and low abundance of clay minerals, the rocks at Talangakar Formation is good for hydraulic stimulation. UIR PRESS 2020-06-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4191 10.25299/jgeet.2020.5.2.4191 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 81 - 88 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4191/2518 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4247 2022-01-18T01:28:03Z JGEET:ART

Analysis of Ultramafic Rocks Weathering Level Using the Magnetic Susceptibility in Konawe Regency, Southeast Sulawesi, Indonesia Jahidin Ngkoimani, LO. Salihin, LM. Iradat Hasria Hasan, Erzam S. Ido, Irfan Asfar, Suryawan Ultramafic rock weathering level magnetic susceptibility Konawe Regency Geosains The Konawe region is part of the Sulawesi Southeast Arm ophiolite belt where ultramafic rocks are exposed in the form of dunite and peridotite. The formation of nickel deposits is closely related to the weathering process of ultramafic rocks as a source rock. Ultramafic rocks exposed to the surface will experience weathering which is influenced by many factors, including in the form of climate change, topography, and existing geological structures. The weathering process in the source rock can influence variations in chemical elements and magnetic properties in laterite soil profiles. For example, the chemical weathering might affect magnetic mineralogy and the physical weathering could affect granulometry as well as the quantity of magnetic minerals in the soil. Condition of weathering of ultramafic rocks (initial, moderate and advanced) can affect nickel content in laterite sediments. The weathering profile study of serpentine mineral is an indication of the lateralization process that occurs in ultramafic rocks and is carried out through petrographic analysis of thin cuts and polish cuts. Determination of weathering level like this is based on the level of weathering of the mineral serpentine. In this study, the determination of the weathering level of ultramafic rocks (initial, moderate, and continued) uses magnetic susceptibility parameter. A total of 232 ultramafic rock core samples obtained from 34 hand samples were taken from different places and weathered levels were analyzed. The results of the research have shown that the magnetic susceptibility of ultramafic rocks in the study area varies, from 580 x 10-6 SI to 4.724 x 10-6 SI. Based on the value of magnetic susceptibility, magnetic minerals contained in ultramafic rock samples are hematite and geotite minerals. This means that the weathering level of ultramafic rock samples is the continued weathering level. The level of continued weathering that occurs in ultramafic rocks in the study area produces nickel laterite deposits with a nickel content of 1.65 - 2.40% in the saprolite zone, 0.42% in the saprock zone, and 0.20 - 0.51% in the basic rock zone (bedrock). UIR PRESS 2020-06-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4247 10.25299/jgeet.2020.5.2.4247 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 59 - 66 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4247/2515 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4266 2022-02-16T00:33:35Z JGEET:ART

Simulation of Time-Lapse Resistivity Method on Sandbox Model to Determine Fluid Changes and Desaturation Rizka, Rizka Piskora, Beta Arroma Satiawan, Soni Saputra, Hendra Time-lapse resistivity Electrical Resistivity Tomography Sandbox model Geophysics Time-lapse resistivity method is an implementation of the resistivity method that is executed exactly at the same spot but with various in time. In this study, the technique uses to identify the dynamics of groundwater fluids. The application of the time-lapse resistivity method was carried out by performing a sandbox model simulation that contains layers of rocks with a fault structure. The rock layers consist of tuff, fine sandstone, shale, coarse sandstone, gravel that represents confined and unconfined aquifers. The simulation was achieved by applying the Electrical Resistivity Tomography (ERT) dipole-dipole configuration at the same place, and measurements with 3 different conditions, namely dry, wet conditions filled with 2.5% water and wet conditions filled with 5% water. Data acquisition uses Naniura resistivity meters with a track length of 96 cm. The first measurement results (dry conditions) obtained a range of resistivity values ​​from 3.7 to 168.1 Ω.m, the second measurement (wet conditions filled 2.5% water) obtained the range of resistivity values ​​from 3.3 to 110.8 Ω.m and the third measurement (wet conditions) filled with 5% water the resistivity values ​​range from 1.7 to 91.2 Ω.m. Following the results of time-lapse inversion processing, a larger percentage change in the amount of 5.6% due to water absorption by the surface which then migrates into the inner layer. Whereas the percentage of desaturation ranges is from -3.11 to 0.217 %, refer to Archie’s Law assumes conduction is caused by water content. UIR PRESS 2020-12-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4266 10.25299/jgeet.2020.5.4.4266 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 198 - 203 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4266/2935 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4503 2022-01-12T19:38:58Z JGEET:ART

Gas Saturated Sandstone Reservoir Modeling Using Bayesian Stochastic Seismic Inversion Wibowo, Rahmat Catur Ar, Ditha Arlinsky Ariska, Suci Wiranatanagara, Muhammad Budisatya Riyadi, Pradityo Seismic geostatistic stachastic inversion Bonaparte basin Geology This study has been done to map the distribution of gas saturated sandstone reservoir by using stochastic seismic inversion in the “X” field, Bonaparte basin. Bayesian stochastic inversion seismic method is an inversion method that utilizes the principle of geostatistics so that later it will get a better subsurface picture with high resolution. The stages in conducting this stochastic inversion technique are as follows, (i) sensitivity analysis, (ii) well to seismic tie, (iii) picking horizon, (iv) picking fault, (v) fault modeling, (vi) pillar gridding, ( vii) making time structure maps, (viii) scale up well logs, (ix) trend modeling, (x) variogram analysis, (xi) stochastic seismic inversion (SSI). In the process of well to seismic tie, statistical wavelets are used because they can produce good correlation values. Then, the stochastic seismic inversion results show that the reservoir in the study area is a reservoir with tight sandstone lithology which has a low porosity value and a value of High acoustic impedance ranging from 30,000 to 40,000 ft /s*g/cc. UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4503 10.25299/jgeet.2020.5.1.4503 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020; 19 - 24 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/4503/2415 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4504 2022-02-07T19:44:44Z JGEET:ART

Identification of Clay Mineral Content Using Spectral Gamma Ray on Y1 Well in Karawang Area, West Java, Indonesia. Wibowo, Rahmat Catur Pertiwi, Alia Puja Kurniati, Suci Clay Minerals SNG Northwest Java Basin Source Rock Reservoir Geophysics Geology Northwest Java Basin (NWJB) is one of the proven hydrocarbon basins in Indonesia. The scope of this paper will focus onthe shales and sandstone interval within Y1 well in Karawang area, NWJB, Indonesia.A cored interval from Y1 well was chosen for an investigation of the clay minerology for the gamma-ray activity and with the purpose of determining how the Spectral Natural Gamma (SNG) log could be used as an indicator of source rock and reservoir quality. The Th/U as a redox indicator is used to assert that the shales are of anoxic conditions of shallow marine environments. Despite the relatively high insoluble Th values (60-74.15) ppm, the presence of U in substantial amounts, which only occurs in reducing conditions where it is preserved as a lower insoluble valence (U4+) explains for the low Th/U values ranging between (5.8-7.1) ppm/ppm. The overall Th/U value of the evaluated shales remain less than 25, where Th/U <25 is suggestive of marine sediments, whereas Th/U <4 is indicative of marine black shales of reducing conditions. Although no linear relationship was found between clay content and K, Th, or U, the K content characteristic three discrete reservoir characteristic (RC). The RC-I has predicted a matrix-supported texture with the highest K signal, illite and illitised kaolinite are roughly equal in importance as source of K. The RC-II has predicted a grain-supported texture with intermediate K content. K-feldspar, mica and illite as the main sources. The RC-III has predicted have a low K content with grain-supported texture and most of the K is hosted in feldspar. Overall, the laboratory measurements appear to be applicable to the log data, and, using SEM or XRD, the detail facies subdivision can be extended throughout the source rock and reservoir section based on the SNG log. UIR PRESS 2020-08-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4504 10.25299/jgeet.2020.5.3.4504 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 136 - 142 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4504/2653 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4676 2022-02-07T19:41:18Z JGEET:Rev

The assessment of landslides disaster mitigation in Java Island, Indonesia: a review Zamroni, Akhmad Kurniati, Ayu Candra Prasetya, Haris Nur Eka Landslides Mitigation Government Researcher Local community Geology The frequency of landslides and the fact that a large number of people live in the landslides-prone areas lead to a high death toll in Java Island, Indonesia – over 1,112 people in the period between 1999 and 2005. Indonesian National Disaster Management Agency (Badan Nasional Penanggulangan Bencana [BNPB]) reported 2,766 landslides that occurred in Java from 2014 to 2019, with 662 deaths. From its state, it looks as if Indonesia 's disaster mitigation is still weak. It is very essential to a deep understanding of landslides disaster mitigation weakness in Indonesia with the approach of governments, researchers, and local communities action. This research is a review of landslides disaster mitigation in Java Island with the approach of governments, researchers, and local communities action. Furthermore, the purpose of this study is to highlight the driving forces of landslides disaster mitigation in Java Island, Indonesia. From the assessment of each stakeholder (government, researchers, and local communities), the driving forces of landslides disaster mitigation in Java Island are the central government has commanding disaster management activities to local governments. However, the implementation of landslides disaster mitigation at the regional level has some obstacles such as the lack of residential development planning.Many landslide research results have only become scientific papers but the landslides-prone areas have not been fully paid attention by the local government such as the absence of landslide danger warning signs.In addition, the level of preparedness and awareness among local communities is not constant at any given time. Usually, community preparedness levels can be high following a disaster. It is likely, however, to diminish over time. UIR PRESS 2020-08-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Review application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4676 10.25299/jgeet.2020.5.3.4676 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 124 - 128 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4676/2651 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4681 2022-10-10T01:19:25Z JGEET:ART

Effects of Corn Stalks Ash as A Substitution Material of Cement Due to the Concrete Strength of Rigid Pavement Mildawati, Roza Puri, Anas Handayani, M. Zaky Compressive Strength Flexural Strength Optimum Content Rigid Pavement Cement Substitution Cement is an adhesive material for concrete mixtures in addition to water, fine and coarse aggregates. One of the main ingredients of cement is silica (SiO2) which is originated from the earth's crust. Silica is also available in plants such as corn stalks. This research is aimed to utilize the corn stalk ash (CSA) as an alternative substitution for some cement in concrete for the rigid pavement of road construction. According to the Indonesian standard, the flexural tensile strength should be exceeded at least 4.5 MPa. The flexural tensile strength has also a correlation due to compressive strength. The concrete materials consisted of the coarse aggregate (river crushed stone) from Kampar River and Danau Bingkuang sands from Kampar District of Riau Province, and Portland Composite Cement from Semen Padang. The CSA was made by burning the dried corn stalks in a steel cylinder can over 24 hours. The content of CSA was varied by  0%, 5%, 7% and 9%. The compressive strength design of concrete was 31,3 MPa. Testing procedures were based on the Indonesian Standard for concrete. The tested specimens have consisted of cube specimens (150 mm x 150 mm x 150 mm) for compressive tests, and beam specimens (150 mm x 150 mm x 600 mm) for flexural strength tests. All specimens were tested on 28 days-age. The results show that CSA can be used as a partial substitution of cement in concrete. The addition of CSA tends to increase the compressive strength of concrete instead of its flexural tensile strength. The optimum content of CSA was 7% and resulted in an 8.0% and 6.9% increase in compressive and flexural tensile strength due to design respectively. Compressive and flexural tensile strength fulfilled the standard. Flexural tensile strength is obtained by 15% of the compressive strength. Cornstalk ash can be used as a substitution of cement for rigid pavement concrete. It can reduce the utilization of cement and will be potentially cost efficiency. UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4681 10.25299/jgeet.2022.7.1.4681 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022); 21 -26 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4681/4061 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4737 2022-02-16T00:28:03Z JGEET:ART

Raster-based Model for Mass Movement in Malang Regency, East Java, Indonesia. Wibowo, Sandy Budi Lavigne, Franck Rifai, Siddiq Luqman Suryandari, Rani Rahim Nurani, Idea Wening St. Dwi Ermawan Danas Putra Pamungkas, Wahyu Widi Geo-Information Technology raster-based models Landslides mass movements Geohazard Strengthening geospatial technology is very important in order to support disaster mitigation strategy, to manage vulnerable communities and to protectcritical environments. The main challenge in identifying disaster characteristics such as mass movements is the lack of direct observation during the event because it is too dangerous for researchers. Geo-Information Technology as a product of Geographic Information Science can be used as a solution in order to model the characteristics of mass movements. The purpose of this study is focused on identifying landslide processes from point of view ofraster-based model. The method of thisresearch emphasizes dynamic landslide model derived from timeseries raster calculation using MassMov2D algorithm. The geographic database that was built for spatial modeling comes from pedogeomorphological and Remote Sensing survey outputs, especially topographic data, landforms and soil physical properties. The result shows that the relationship between pixels (neighborhood) is determined by the topology of the energy gradient line direction which allowsto transfer the value between each pixel.The movement of landslide material starts from the toe. This decreases the stability of the landslide material in the main body of the landslide and generate progressive erosion.The raster-based model can finally reconstruct and identify the stages of initiation, transport and deposition landslide material. UIR PRESS 2020-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4737 10.25299/jgeet.2020.5.4.4737 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 169 - 174 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/4737/2858 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4941 2022-01-12T23:54:04Z JGEET:CVR

Front Matter JGEET Vol. 05 No. 01 2020 (J. Geoscience Eng. Environ. Technol.), JGEET Front Matter JGEET Vol. 05 No. 01 2020 UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4941 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/4941/2421 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/4942 2021-05-09T19:30:33Z JGEET:BC

Back matter JGEET Vol 05 No 01 2020 (J. Geoscience Eng. Environ. Technol.), JGEET Back matter JGEET Vol 05 No 01 2020 UIR PRESS 2020-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/4942 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 1 (2020): JGEET Vol 05 No 01: March 2020 2541-5794 2503-216X 10.25299/jgeet.2020.5.1 eng https://journal.uir.ac.id/index.php/JGEET/article/view/4942/2422 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5048 2022-01-18T01:35:50Z JGEET:ART

Settlement and Capacity Analysis of Land Support Development on Flyover in Large City; Pekanbaru, Indonesia Kausarian, Husnul trionaldi, evan Khalif Arrahman, taufan bagus eka putra, dewandra Batara Sieve analysis Atterberg Limit the capacity of soil support and settlement N-SPT Plaxis 2D Modelling Flyover Geology geotechnical The study area located on the street of Soebrantas to Soekarno Hatta Street, with the coordinate position of 0 ° 30 ' 0.79  "N 101 ° 24 ' 57.88 "E - 0 ° 30 ' 0.16 "N 101 ° 24 ' 53.17 "E in Pekanbaru City, Indonesia. The development that will Conduct flyovers in this area became the basis of this research. The main study of this research is to find out how an Atterberg's boundaries, compressibility, and the likelihood of a ground decline in drill 1 use the value of N SPT to match with the purpose of this study. Which is (1) to know the large grain size of soil samples, (2) Knowing the value of the liquid limit, the plastic boundary, and the plastic index of the soil samples, (3) Knowing the possibility of land degradation in the research area, (4) Power capacity analysis of ground support (5) Knowing the decline of modeling using the Plaxis 2D method (6) knows the relationship of decreasing values based on NSPT and Plaxis (7) Knowing the relationship of sieve analysis and Attaberg limit with decreased results. Methods of data retrieval have done with soil testing in the field and soil testing in the laboratories. A comprehensive analysis of the grain has done with sieve analysis. Plastic boundary, liquid, and plastic boundary indices with method Attaberg limit. Decreased analysis and Power capacity analysis of ground support with NSPT value tests. UIR PRESS 2020-06-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5048 10.25299/jgeet.2020.5.2.5048 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 89 - 95 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5048/2528 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5057 2021-11-22T02:24:12Z JGEET:ART

Mapping of Sediment on the Waters Around Panjang Island, Banten Bay, Indonesia Harahap, Syawaludin A Yuliadi, Lintang P. S. Purba, Noir P. Aulia, Awal A. Banten Bay grain size Panjang Island phi (φ) scale sedimentation Geology This study was conducted to map the surface sediment conditions in the waters around Panjang Island, Banten Bay. The survey method was conducted in February 2015 by taking sediment samples using a grab sampler at 15 stations. Sediment analysis was conducted to determine the grain size using the granulometry method which was then processed using the KUMMOD-SEL software to obtain the composition and texture of the sediment. The results of processing sediment samples at each station obtained that the grain size of sediments in the waters around Panjang Island ranged from -0.7 to 2.6 in the phi (φ) scale. Sediment composition consists of sand and gravel, with sand dominance of 89.1 %. Sediment textural classification consists of only 4 categories i.e. very coarse sand, coarse sand, medium sand, and fine sand. In general, the pattern of sediment distribution follows the pattern of water depth, where fine sand occupies deeper areas. Meanwhile, medium sand dominates surface sediment distribution in the study area. UIR PRESS 2021-06-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5057 10.25299/jgeet.2021.6.2.5057 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 99 - 106 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5057/3296 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5094 2022-01-18T01:31:56Z JGEET:ART

Subsurface Shallow Modelling Based on Resistivity Data in The Hot Springs Area of Libungo Geothermal, Gorontalo, Indonesia Manyoe, Intan Noviantari Hutagalung, Ronal Fracture Fluids Thermal Lithology Schlumberger Geosains Volcano-tectonic events in Libungo can be the cause of the presence of geothermal potential. There is no detailed research on shallow subsurface conditions in Libungo that can show the distribution of subsurface fluids. This research aims to create a shallow subsurface model of the Libungo geothermal area based on resistivity data. Resistivity data collection was carried out in the Libungo hot springs area. The electrode configuration used is the Schlumberger configuration. The variation in resistivity values is calculated using current data, potential difference data and geometry factors. The results of the calculation of the resistivity values variation are plotted versus depth. Variations of resistivity value versus depth are then displayed in the form of a single log, lithology distribution and 3D lithology model. The results showed that the shallow subsurface of the Libungo geothermal area was composed of andesite, volcanic breccia, silty clay and clay. Andesite in the research area has resistivity values ranging from 320 - 349 Ωm, has slightly fracture and is andesite dry. Volcanic breccia has a resistivity value of 177-198 Ωm, has a well to slightly fracture and is a volcanic breccia moist. Silty clay has a resistivity value of 3.25-37.99 Ωm and is a wet to moist silty clay. Clay has resistivity values in the range 1.56-2.78 Ωm and is wet to moist clay. Fluid distribution in the shallow subsurface area occurs in volcanic breccia, silty clay and clay. Shallow subsurface fluids accumulate mostly in the northern part of the Libungo geothermal area. UIR PRESS 2020-06-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5094 10.25299/jgeet.2020.5.2.5094 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 75 - 80 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5094/2517 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5111 2022-02-07T19:39:20Z JGEET:ART

Analysis of Shoreline Shift using Satellite Imagery near Makassar City Amukti, Rian Adji, Arif Seno Ruslan, Syamsuri Makassar Abrasion Accretion Shoreline Geosciences Shoreline shift have occurred in the Coastal region of Makassar City in recent years due to abrasion and accretion. Spatial temporal feature extraction of the Makassar City Region has been carried out using remote sensing techniques  withRadiometri,  Geometric Corrections and Composite Imagein the Landsat image dataset in 2009 and 2019. This study aims to analyze shoreline shift near Makassar City with remote sensing technology using Landsat imagery data, based on multi-temporal data with visual and digital analysis techniques between 2009 and 2019. This research contributes to local and central government as baseline data (data base) in making decisions for handling coastal areas. The results showed that the length of the Makassar City coastline without including the coastline length of the islands separated from land in a row that is equal to 37.79 km in 2009. While in 2019 there was a significant change that is 49.82 km. This shows the addition of a coastline of 12.03 km in the span of 10 years. These changes are mainly caused by anthropogenic factors, namely the construction of the pier / port and the reclamation and hydro-oceanographic factors, namely waves, currents and tides. UIR PRESS 2020-08-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5111 10.25299/jgeet.2020.5.3.5111 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 119 - 123 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5111/2650 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5112 2021-08-29T20:09:39Z JGEET:ART

Evaluation of Groundwater Quality Status Around Gunung Tugel Landfill In Kedungrandu Village, Patikraja District, Banyumas Regency, Central Java, Indonesia. Yogafanny, Ekha Nandinia, Annete Ratnagreha Sungkowo, Andi groundwater Groundwater Quality Status Pollution Index groundwater quality Gunung Tugel Disposal Site (GTDS) is one of the final land disposal sites established in 1983 in the Banyumas Regency, and it operates with an open-dumping system. In this system, the base of the disposal site is neither coated with an impermeable layer nor equipped with leachate collection and drainage channels, for which leachate can percolate through the soil and pollute groundwater. In March 2016, GTDS was closed because its capacity had been exceeded. The closure of GTDS was not followed by appropriate waste and environmental management, prompting the formation of leachate that can contaminate the environment, particularly groundwater. This research set out to identify the leachate quality of GTDS, assess the groundwater quality, and determine the groundwater quality status around the disposal site. It employed a field survey and mapping to plot and display the groundwater well points in the study area, laboratory analysis to identify the groundwater quality, and pollution index calculation to determine the groundwater quality status. The groundwater samples were tested in the laboratory for their physical (turbidity and TDS), chemical (pH, COD, BOD, iron (Fe), cadmium (Cd)), and biological properties (total coliform). The results showed that the cadmium (Cd) levels in several groundwater well points had exceeded the quality standards. Based on the analysis and calculation results, the groundwater quality status in the study area is mildly contaminated, with the pollution index ranging between 2.571 and 4.099. UIR PRESS 2021-03-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5112 10.25299/jgeet.2021.6.1.5112 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 42 - 50 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5112/3123 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5115 2022-02-07T19:38:59Z JGEET:ART

Resistivity Models of Pantar Island Geothermal System East Nusa Tenggara, Indonesia Taufan, Yoqi Ali Syafri, I. Risdianto, D. Zarkasyi, A. Rahadinata, T. Awaludin, W. Magnetotellurics resistivity models geothermal system Geothermal Geophysics Resistivity The subsurface geological conditions of a geothermal system are vital objects to be considered in geothermal exploration. The Magnetotellurics survey was conducted to explore for geothermal potential in Pantar Island. This is to achieve deeper penetration compared to our previous study that adopted resistivity method to determine reservoir zones based on rock resistivity models. The difference in rock resistivity in geothermal systems provides subsurface geological information in the form of low resistivity that associated the clay cap zones (high conductive), the medium resistivity zones associated with the reservoir zones, and high resistivity associated with a heat source. The results of 2D and 3D models from MT data show that the low resistivity value (<20Ωm) as a clay cover zones, this layer from the surface to -1000 meters. Medium resistivity values ​​(20-100 Ωm) starting from depths -1000 meters to -2000 meters associated with reservoirs zones, high resistivity values (> 200 Ωm) starting from depths of -2000 meters are considered as heat source from the Pantar geothermal system. UIR PRESS 2020-08-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5115 10.25299/jgeet.2020.5.3.5115 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 113 - 118 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5115/2649 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5149 2022-02-16T00:29:28Z JGEET:ART

Analysis of the Surface Subsidence of Porong and Surrounding Area, East Java, Indonesia based on Interferometric Satellite Aperture Radar (InSAR) Data. Arifianto, Indra Wibowo, Rahmat Catur surface subsidence InSAR Porong East Java Remote Sensing Since 2006, the mud volcano erupted in the Porong area due to wellbore failure triggered by an earthquake (2006) epicenter in the Jogjakarta area. The mud volcano buried several villages with mud and continued erupted until today. Based on the InSAR data, it can be seen that the subsidence is still happening near the dam area and another area that is not related to mud volcano eruption such as the production of two gas fields in the Porong area. Moreover, the Porong area is flat and low, less than 4 meters above sea level. The analysis shows that the subsidence rate in this area is up to 0.5 m/yr. If this subsidence is continuing, the city can be sinking and flooding during the rainy season. The prediction result from this method is about 10 years more and 36 years since in 2006 based on the mudflow rate method. UIR PRESS 2020-12-02 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5149 10.25299/jgeet.2020.5.4.5149 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 175 - 180 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5149/2866 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5187 2022-02-07T19:45:49Z JGEET:ART

Association between Surface Air Temperature And Land Use On The Campus Scale Alif, Satrio Muhammad Yosua, Erwin Fauzi, Adam Irwansyah Leksono, Bambang Edhi Temperature Land Use Multiple Linear Regression Least Square Geomathics The increasing trend of global temperature is related to the land use change in the form of urbanization. The impact of land use change to surface air temperature in Indonesia especially in smaller scope in Indonesia have not researched yet. The study area is located on newly built campus and the development of land use change inside campus can be managed carefully. This research aim is to determine which land use affecting high-temperature by using multiple linear regression method with least square approach so that temperature increase can be controlled in which some land uses must be preserved in urbanization. Land use data is interpreted from the photo map of 275 hectare campus. Temperature data is measured by using the digital thermometer three times a day. The method idea is to obtain distinctive contribution of every land use to every temperature measurement point. The contribution follows the inverse distance weighted concept. Surface air temperature measurement points are located with 150 meter interval and centroids of land use polygons are used for association calculation. Temperature measurement shows values between 25.5oC and 35.4oC. Land use with more anthropogenic activities and rubber plantation are the top contributors to high surface air temperature within a day. In the non-built-up land use category, water body increases the temperature in the daytime. Anthropogenic activities and vegetation density within land use is the main factor in increasing the surface air temperature so that it is suggested to plant farm-like vegetation around every built-up land use. UIR PRESS 2020-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5187 10.25299/jgeet.2020.5.3.5187 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 143 - 150 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5187/2669 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5207 2022-02-07T19:26:16Z JGEET:CVR

Front Matter JGEET Vol. 05 No. 03 2020 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2020-06-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5207 10.25299/jgeet.2020.5.3.5207 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5207/2530 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5208 2021-05-09T20:08:35Z JGEET:BC

Back matter JGEET Vol 05 No 02 2020 (J. Geoscience Eng. Environ. Technol.), JGEET Back matter JGEET Vol 05 No 02 2020 UIR PRESS 2020-06-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5208 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5208/2531 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5217 2021-08-29T20:09:39Z JGEET:ART

Microscopy Observation of Samosir Formation Paleosoil, Tuktuk Sidaong, North Sumatera, Indonesia. Gathot Harbowo, Danni Zahra, Siti Paleosoil Toba Caldera Samosir Island Geology Samosir is the islands that emerge and standing upon on Toba Caldera after it’s the last eruption at 74.000 years ago. Samosir Island known as the caldera floor that uplifts parallel with Toba’s caldera flooding. In this study, we have observed an outcrop in Tumutuk, Samosir Island that hypothesized as a lacustrine deposit, and we found a paleosoil layer that might give more answers about the geological process in this area at the past time. Based on this outcrop, we described it, followed to measure its stratigraphy section, and took representative samples from the paleosoil layer, then observed the samples under the stereo-microscope as polish rock section, in normal light & negative images. As the result we identify several features of paleosoil & its sedimentary grain that shown this paleosoil layer, two events of the volcanoclastic deposits flown, and exposed two-time, and forming soil, it may form in the shallow swamp in a lacustrine environment, coincide with caldera flooding and caldera floor uplift event. UIR PRESS 2021-03-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5217 10.25299/jgeet.2021.6.1.5217 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 9 - 15 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5217/3119 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5285 2022-02-07T19:43:05Z JGEET:ART

The Permeability of Granite Weathering Soil in Tanjungpinang, Bintan Island, Indonesia Erawan, Fery Sukiyah, Emi Hutabarat, Johanes Sudradjat, Adjat Permeability Granite Weathering Waste Disposal Site Riau Islands Geology Bintan Island is a part of Riau Islands Province. On this island, the capital city is Tanjungpinang. The compliance of public facilities such as landfill waste is a priority in this city. Landfill design that suitable in this area is a sanitary landfill system. The soil layer uses to cover the waste in this landfill system. The closure did gradually avoid the disruption of waste processing. The type of soil for its landfill cover has to be able to control the leachate. It controlled by the permeability of the soil. The methods used in this study are the analysis of the physical and mechanical properties of soil. Rock and soil samples are obtained systematically through trenching. Sampling-based on changes in physical properties of soil that reflect its mechanical properties. A probabilistic approach used to solve the problems and to get accurate results. The geomorphology of the study area divided into four units. They are very flat terrain, flat terrain, slightly steep hills, and steep hills. The sample used for the study is undisturbed soil. Analysis of the physical and mechanical properties of soil shows the types of soil, such as SW, GM, MH-OH, and CH. However, MH is the most dominant type of soil. Each of the soil types represents a certain degree of weathering. The degree of weathering in the study area varies from the III degree to VI degrees. Rocks are weathering form clay mineral, which compiles the soil. Clay mineral in the soil layer is varied from quartz, illite, kaolinite, gibbsite, goethite, and hematite—the impact of the swelling of clay. The swelling of clay in the study area ranged from low to high. The properties and composition of the soil are affected by the permeability value. UIR PRESS 2020-08-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5285 10.25299/jgeet.2020.5.3.5285 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 129 - 135 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5285/2652 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5340 2022-01-18T01:40:08Z JGEET:ART

Geophysical Survey on Open Dumping Landfill for Monitoring Spread of Leachate: A Case Study in Pekanbaru, Riau, Indonesia Suryadi, Adi Islami, Frezy Ukhuah Kausarian, Husnul Putra, Dewandra Bagus Eka Contamination Groundwater Landfill Leachate Pekanbaru Resistivity geophysics Pekanbaru is a city in Indonesia with high population growth. The increasing amount of the population has a parallel relationship with the increasing quantity of waste disposal. This study has been conducted on an open dumping landfill at Pekanbaru that surrounded by residential areas. Waste disposal produces leachate as a threat to surface water and groundwater resources. This study aims to investigate the contamination spread formed by leachate using the geophysical method. Direct Current Resistivity (DCR) has been used to produce 2 D Resistivity subsurface Models. Data acquisition has been done using multi-electrodes (32 electrodes) with spacing 2 m between electrodes. 2D Resistivity model produced, a contaminant from leachate represented by low resistivity value 26.1 - 870 Ωm. The deepest penetration of leachate that detected is around 3 m from the surface. It has been understood that leachate from the landfill of the study area is not contaminated groundwater yet. It confirmed by groundwater analysis at residential around the landfill area. By knowing the spreading of leachate, preventive action can be made to maintain the quality of groundwater resources. UIR PRESS 2020-06-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5340 10.25299/jgeet.2020.5.2.5340 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020); 104 - 107 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5340/2577 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5400 2023-01-09T20:40:17Z JGEET:ART

Analysis of gravity anomaly decomposition and depth to basement, case study: Cenozoic Bogor Basin, Indonesia. Hanif, Muhammad Handayani, Lina Arisbaya, Ilham Nur Aulia, Atin L. Gaol, Karit Bouguer Upward Polynomial Bogor Basin Depth Basement Geophysics The Cenozoic Bogor Basin situated on the SE edge part of Sunda shelf is presumed to have hydrocarbon potential on its turbidite deep-water play. The deep subsurface geometry of this basin may play an important role, yet unexplored, to the hydrocarbon exploration. The gravity method is advantageous to illuminate the subsurface structure on the arbitrary depth and various sources. Eight-hundred-thirty-eight points of ground-based gravity survey were collected on roughly one kilometer spacing in the North of Bandung to Pamanukan region covering the Cenozoic Bogor Basin on the Subang-Purwakarta segment to generate complete Bouguer anomaly (CBA) map. This study examines the two robust methods of gravity anomaly decomposition (i.e., polynomial trend surface and upward continuation) by using multiple parameters to match the geological background. Radially averaged power spectrum was used to estimate the depth of anomalous source corresponds to the top of basement layer and resulting 4 km basement depth in North West Java basin and below 1 km on Tangkuban Parahu volcanic zone. The resulting estimated depth of Cenozoic Bogor Basin was evaluated by the matched a priori published data on those two areas and revealed the depth of depocenter (deepest sediment) on the Cenozoic Bogor Basin is up to 9 km, quite a deeper extent than previously assumed. UIR PRESS 2021-03-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5400 10.25299/jgeet.2021.6.1.5400 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 51 - 57 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5400/3126 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5431 2021-08-29T20:09:39Z JGEET:ART

Hydrocarbon Prospectivity in the undrilled area of AIMA Field in the Niger Delta Basin, Nigeria. Ogbamikhumi, Alexander Ighodalo, John Elvis Rock Physics Neural Network Reservoir Properties Cross-plot Analysis Seismic Inversion Hydrocarbon exploration Field development is a very costly endeavor that requires drilling several wells in an attempt to understanding potential prospects. To help reduce the associated cost, this study integrates well and seismic based rock physics analysis with artificial neural network to evaluation identified prospects in the field.  Results of structural and amplitude maps of three major reservoir levels revealed structural highs typical of roll over anticlines with amplitude expression that conforms to structure at the exploited zone where production is currently ongoing. Across the bounding fault to the prospective zones, only the D_2 reservoir possessed the desired amplitude expression, typical of hydrocarbon presence. To validate the observed amplitude expression at the prospective zone, well and seismic based rock physics analyses were performed. Results from the analysis presented Poisson ratio, Lambda-Rho and Lambda/Mu-Rho ratio as good fluid indicator while Mu-Rho was the preferred lithology indicator.  These rock physics attributes were employed to validate the observed prospective direct hydrocarbon indicator  expressions on seismic. Reservoir properties maps generated for porosity and water saturation prediction using Probability Neural Network gave values of 20-30% and 25-35% for water saturation and porosity respectively, indicating  the presence of good quality hydrocarbon bearing reservoir at the prospective zone. UIR PRESS 2021-03-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5431 10.25299/jgeet.2021.6.1.5431 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 34 - 41 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5431/3122 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5433 2022-02-16T00:25:56Z JGEET:ART

Stream Sediment Geochemical Survey on Metamorphic Rock, Kolaka, Southeast Sulawesi, Indonesia. Tonggiroh, Adi Stream Sediment Metamorphic Rocks Kolaka Geochemistry Abstract The aim of this research is to conduct surface geological mapping to determine the lithologies that underlies the linear geochemical characteristics of Ag, As, Cd, Co,Cu, Fe, Mn, Ni, Pb, Zn by using stream sediment data. Furthermore, to know the distribution of these elements lithologically in the area. This study uses 10 sediment stream samples of 80 mesh up to 100 mesh which then chemical elements are analyzed with AAS. Alteration mineralization occcurs in quartz chlorite geneiss: quartz, epidote, chlorite, muscovite, sericite, calcite, monmorillonite, pyrite, sphalerite, bornite and chalcopyrite. Based on linearity analysis elements are grouped into three according to the significant value of 0.3 to 0.9, which are significant elements Ni, Pb=Cu=Zn and As, abundant elements in lateralization and sulphide mineralization. The geochemical characteristics of the Ni element reflect the associated distribution of ultramafic weathering which results are transported regionally and together with other elements as stream sediments. While Pb, Cu, Zn are related to quartz veins in metamorphic or intrusive rocks. UIR PRESS 2020-11-25 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 'text' application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5433 10.25299/jgeet.2020.5.4.5433 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 164 - 168 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5433/2857 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5436 2021-08-29T20:09:39Z JGEET:ART

The Soft Layer Thickness Estimation using Microtremor Measurement to Identify Landside Potential in Watukumpul, Central Java, Indonesia. Prabowo, Urip Nurwijayanto Ferdiyan, Akmal Amalia, Ayu Fitri Microtremor HVSR Soft layer thickness Watukumpul is an area that is prone to landslides, so determining the soft layer thickness is very important to identify the landslide potential. The soft layer thickness can be estimated using microtremor signal measurements which analyzed using the Horizontal to Vertical Spectral Ratio (HVSR). In this study,we measured microtremor signal of 33location around Watukumpul, Pemalang, Central Java area to determine soft layer thickness. Micretremor signal was analyzed based on theHVSR method using Geopsy software and follow the standard of the Sesame Europan Project. The results of the HVSR method are the HVSR curve that fulfills the reliable curve standard. HVSR curve shows that the dominant frequency of soft layer ranges from 1.36 – 7.62 Hz and the amplification values ranges from 9.00 – 41.45. The soft layer thickness value in the study area ranges from 17.58 - 103.60 meters. The high landslide potential area are located at W7, W8, W18, W30 and W32 where has thin soft layer and high soil slope. UIR PRESS 2021-03-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5436 10.25299/jgeet.2021.6.1.5436 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 16 - 23 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5436/3120 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5488 2022-02-07T19:46:30Z JGEET:ART

Groundwater Quality Assessment for Drinking Purpose Based on Physicochemical Analysis in Teluk Nilap Area, Rokan Hilir, Riau, Indonesia. Putra, Arief Yandra Mairizki, Fitri Groundwater physical chemical drinking water Hidrology Chemical Groundwater is water resource that widely used for domestic purposes, including for drinking. However, the industrial and population growth causes the quality and quantity of groundwater to decline. In this case, the quality of drinking water in Indonesia must meet the requirements according to Health Minister Regulation No.492/MENKES/PER/IV/2010. This study aims are to determine the quality of groundwater in the research area based on physicochemical parameters and its evaluation for drinking water. Groundwater samples were taken from dug wells in Teluk Nilap area, Rokan Hilir, Riau. Groundwater samples have temperature average 30oC, TDS average 312,5 mg/L and pH average 5,6. Groundwater contain sulfate and nitrate with average value 48,8 mg/L and 11,86 mg/L, respectively. Groundwater water also have iron and lead metal above the permitted standard with average value 2,57 mg/L and 0,022 mg/L. Groundwater in the study is not recommended as drinking water. UIR PRESS 2020-08-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5488 10.25299/jgeet.2020.5.3.5488 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020); 151 - 154 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5488/2670 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5495 2022-02-16T00:36:21Z JGEET:ART

Determining Groundwater Potential Using Vertical Electrical Sounding Method In Manggar, Balikpapan City, Indonesia. Sastrawan, Febrian Rahmania Arisalwadi, Meidi Groundwater Resistivity Aquifer factor formation Geoscience Clean water requirement in Manggar Urban Village of Balikpapan City is rising along with population growth. The main source of clean water that can be used is ground water in the aquifer layer. The Study of groundwater potential was conducted using vertical electrical sounding (VES) method to determine the presence and types of aquifer layers. The measurements along four measurement points revealed four aquifers buried in depth ranging from 48 to 53 m below the surface. The layer which is potential to be an aquifer is a sand layer with moderate-sized grain. The resistivity values for sand layer at each measurement point vary from 221 to 281Ωm. The estimation of sand to be an aquifer layer was supported by the calculation of formation factors. The calculation was based on the ratio of resistivity values from pore-filling water and resistivity values from water-saturated rocks layer. The aquifer revealed in this study is categorized as unconfined aquifer because the upper layer is restricted by sandy clay. The resistivity values vary from 12.8 to 35.4 Ωm which behaved as an aquitard layer. However, low resistivity values between 9.6 to 20 Ωm are detected under the aquifer layer. The layer is identified as clay which behaved as an impermeable layer or aquiclude. UIR PRESS 2020-12-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5495 10.25299/jgeet.2020.5.4.5495 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 209 - 213 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5495/2959 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5501 2022-02-16T00:31:38Z JGEET:ART

Investigation of Groundwater Potential using Electrical Resistivity Method and Hydraulic Parameters in Lam Apeng, Aceh Besar, Indonesia. Darisma, Dian Fernanda, Ferdy Syukri, Muhammad Groundwater Electrical Resistivity Hydraulic Parameter Lam Apeng Geophysics Lam Apeng is a village with a majority of people living as farmers, which causes the need of water for agriculture is increasing. The water demand in this area continues to increase as the population increases, for various purposes. The objective of this study is to determine the distribution of the groundwater layer using the electrical resistivity method and to determine groundwater potential using hydraulic parameters. This research is conducted using 2 measurement line with a length of each line is 112 meters and distances of each electrode is 2 meters. The data invert using Res2Dinv software to obtain 2D subsurface lithology subsurface. At line 1, the aquifer (sand) layer is located in the second layer with a rock resistivity value of 12 Ωm - 18.6 Ωm at a depth of 8 m - 18 m. At line 2, the aquifer (sand) layer is also located in the second layer with a resistivity value of 4.6 Ωm - 18 Ωm at a depth of 5 m – 12 m. Based on the interpretation of the two measurement lines, it can be concluded that the type of aquifer in the research site is a semi unconfined aquifer. In this study, hydraulic parameters (hydraulic conductivity, longitudinal conductance, transverse resistance, and transmissivity) was calculated based on the resistivity value and the thickness of the aquifer layer. The average resistivity of the aquifer layer used is 15.3 Ωm and 11.3 Ωm, respectively for line 1 and line 2, indicating that the aquifer was moderately corrosive. Longitudinal conductance values are 0.65 Ω-1 and 0.62 Ω-1 which indicated moderate protective capacity. The transmissivity values are 6.78 m2/dayand 4.77 m2/day, which indicates that the designation in this area is low and the groundwater potential is local or only for personal consumption. UIR PRESS 2020-12-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5501 10.25299/jgeet.2020.5.4.5501 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 185 - 190 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5501/2923 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5533 2021-05-09T20:45:00Z JGEET:BC

Back matter JGEET Vol 05 No 03 2020 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2020-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5533 10.25299/jgeet.2020.5.3.5533 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 3 (2020): JGEET Vol 05 No 03 : September (2020) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5533/2714 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5583 2021-08-29T20:09:39Z JGEET:ART

Proxapertites from Walat Formation, Sukabumi, West Java, Indonesia Rachman, Rizki Satria Winantris Muljana, Budi Proxapertites Characteristics Walat Formation Sukabumi Proxapertites Proxapertites have become one of the most significant indicators of ancient rock in Indonesia. Walat Formation is one of the oldest rocks exposed in Sukabumi, West Java, Indonesia. These Proxapertites have not been described in detail about their characteristics in previous studies, especially on Walat Formation. Therefore, knowing the characteristics of Proxapertites becomes interesting, especially in Walat Formation, which can be a reference for the characteristics of the late Eocene Proxapertites (37.8 - 33.9 million) in Indonesia. Acetolysis method was carried out for the preparation of pollen and spores; description and determination were carried out to see the characteristics of Proxapertites that present in Walat Formation. Result, there are three types of Proxapertites. Proxapertites operculatus have sizes 23 – 86 µ with average 40.5 (P) and 51.1 (E) µ, index PE 0,43 - 1, Peroblate – Subspheroidal – Oblate Spheroidal, Fine-Reticulate ornamentation, and Asymmetric Monosulcate aperture. Proxapertites cursus have sizes 23 – 86 µ with average 39.8 (P) and 49.8 (E) µ, index PE 0.51 - 1, Oblate – Subspheroidal – Oblate Spheroidal, Reticulate ornamentation, and Asymmetric Monosulcate aperture. Whereas Proxapertites psilatus have sizes 29 – 75 µ with average 42.3 (P) and 52.5 (E) µ, index PE 0.58 - 1, Oblate – Subspheroidal – Oblate Spheroidal, Psilate ornamentation, and Asymmetric Monosulcate aperture. These three Proxapertites can be distinguished by their type of ornamentation. Meanwhile, other aspects have similar characteristics and are affected by the appearance of individual pollen on the slide during preparation. UIR PRESS 2021-03-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5583 10.25299/jgeet.2021.6.1.5583 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 1 - 8 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5583/3118 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5653 2022-02-16T00:34:25Z JGEET:Case

Disaster Mitigation for Palu City Residents in Dealing with Liquefaction Disasters in Accordance of Spatial Patterns of Palu City, Central Sulawesi Province, Indonesia. Kuswandi, Yudi Erwindi, Jossi Dwi Hadian, Moh. Sapari Muslim, Dicky Disaster Geology Liquefaction Spatial Pattern Mitigation Geology Potential natural hazards in Palu City by paying attention to the real physical characteristics of Palu City are categorized as having a high level of disaster hazard. The geological character of both the geological structure and geological engineering in the Palu region shows the great potential for geological disaster hazards. On September 28, 2018, at 18: 02 CIT, an earthquake measuring 7.4 on the Richter scale, the quake's center located in 26 km of Donggala district and 80 km northwest of Palu City. By observing the epicenter's location and the depth of the hypo-central earthquake, it appears that this shallow earthquake occurred due to activity in the Palu Koro fault zone. This fault is the most active in Sulawesi and is the most active in Indonesia with a movement of 7 cm per year. Liquidity disasters or ground liquefaction are also the effects of an earthquake. Shocks a massive quake causes the soil to melt this thing occurs when the saturated soil loses strength and stiffness due to stress. The Petobo area and the Balaroa - Perumnas are close to the Palu Koro active fault line and the land in the area is composed of soft material from the sedimentation process. This area is shallow groundwater with high soil permeability values, namely in the Petobo area and Perumnas - Balaroa. The purpose of this study is to analyze the potential liquefaction disaster in Palu City and analyze the Palu City resident ability against Liquefaction Hazard Prone. This research uses a descriptive qualitative analysis method. Potential liquefaction disasters were analyzing qualitatively based on geological conditions and disaster locations. Disaster mitigation capabilities were analyzed qualitatively based on the Palu City Spatial Pattern. One of the hazards caused by an earthquake that has the potential to be a disaster in Palu City is liquefaction. The ability of residents to mitigate liquefaction in Palu City is influenced by local wisdom which is reflected in ancient times when people lived in the highlands or hills. the concept of building structures, land use, and spatial planning patterns in Palu City which can reduce the threat of liquefaction. UIR PRESS 2020-12-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5653 10.25299/jgeet.2020.5.4.5653 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 191 - 197 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5653/2934 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5680 2021-11-22T02:24:09Z JGEET:ART

The Geomorphological Factors and Its Implications for The Tidal Energy Installations in Java, Indonesia Kurnianto, Fahmi Arif Ikhsan, Fahrudi Ahwan Apriyanto, Bejo Nurdin, Elan Artono Fadilah, Tyas Nisa Geomorphological factor tidal energy Indonesia Geomorpholgy This study aims to place the tidal energy installation effectively in Indonesia based on geomorphological factors. The survey method was used to analyze the characteristics of beaches in Indonesia. Mathematical physics model was implemented to find the new formulas based on geomorphological factors. Tides are the result of gravitational attraction and the centrifugal effect, which is the drive In the earth-moon system, tidal generating forces are the resultant forces that cause tides, namely: the earth-moon system (FS) centrifugal force and the moon's gravitational force (FB). FS works in the center of the mass of the earth-moon system whose mass point is located on the 3/4 radius of the earth.  The style of tidal generator caused by the moon can be calculated by combining Newton's universal gravitational law .The results of this study consist of  F = m ac, where the style of the tidal generator caused by the moon can be calculated by combining newton's universal gravitational law in equation and newton's second law of motion in Equation. The another results is tan =  , where the formula takes into account constants (K) based on slopes. The last result is the constants (K) for each land form starting on 0,00 untill 1,00.  The north coast of Java is more suitable for tidal energy installations because the land form is dominated by alluvium plains of the quaternary age with a lower risk than the southern region of Java. The effectiveness of tidal energy installation depends on the characteristics of the land form. In alluvial plains, the quaternary age of the alluvial plains is more suitable than the hill form volcanic quaternary, tertiary volcanic, and tertiary holokarst. UIR PRESS 2021-06-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5680 10.25299/jgeet.2021.6.2.5680 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 107 - 112 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5680/3303 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5685 2021-09-30T00:48:49Z JGEET:ART

The Influence of External CFRP String Reinforcement on The Behavior of Flexural RC Elements Utomo, Junaedi Rabbani, Nauval Tudjono, Sri Han, Ay Lie Sukamta External Strengthening Carbon Fiber Reinforced Polymer (CFRP) Flexure load-carrying capacity Structural Engineering External reinforcement is an excellent method for improving the load carrying capacity and ductility behaviour of reinforced concrete members in flexure. Enhancement becomes a necessity when current standards mandate a higher performance compared to older codes. External reinforcement is an environmentally friendly and sustainable solution, since demolition and re-building could be postponed, and the building can be used while work in conducted on the members. Carbon Fiber Reinforced Polymers (CFRP), having a low weight-to-volume ratio and an excellent resistance to corrosion, can be used as external reinforcement to effectively increase the flexural and shear strength of a member. To evaluate the effectiveness of CFRP strings, two types of reinforced concrete T-beams were tested. The specimens consist of a strengthened member in both shear and flexure using CFRP wraps and CFRP strings, and a conventional reinforced concrete beam. The specimens were subjected to a one-point-loading system to simulate high shear stresses in combination with a maximum bending moment at mid-point. The installation of CFRP strings was conducted using the Near Surface Mounted (NSM) method, while the sheets were Externally Bonded Reinforcement (EBR). The strings and sheets were impregnated and pultruded on side. The test results showed that the strings and wraps substantially increased the ultimate load carrying capacity and ductility of the member. The ultimate load enhancement was found to be 32% from 117kN to 154kN, and the vertical deformation improved 25% from 16 mm to 20 mm. The failure mode was characterized by initial debonding of the strings in the interface between the strings and the epoxy, followed by string-rupture. The two strings ruptured concurrently, due to stress re-distribution within the member. UIR PRESS 2021-09-17 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5685 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 141 - 146 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5685/3577 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5892 2021-08-29T20:09:39Z JGEET:ART

Integrated Subsurface Analysis of Thickness and Density for Liquefaction Hazard: Case Study of South Cilacap Region, Indonesia. Aditama, Maulana Rizki Sunan, Huzaely Latief Tri Laksono, FX Anjar Ramadhan, Gumilar Iswahyudi, Sachrul Fadlin residual anomaly physical properties gravity acceleration subsurface interpretation Geohazard The thickness of the liquefable layer can be the factor inducing liquefaction hazard, apart from seismicity. Several studies have been conducted to predict the possibility of the liquefable layer based on the filed sampling. However, a detailed investigation of the subsurface interpretation has not been defined, in particular the thickness estimation of the liquefable layer. This study is carried out in south Cilacap area where potential liquefaction is exists due to the earthquake history data and near surface condition. The aim of this study is to investigate the physical properties and thickness distribution using GGMplus gravity data and resistivity data. This research is conducted by spectrum analysis of gravity model and 2D resistivity model . This study’s main results is by performing the residual gravity anomaly with the associated SRTM/DEM data to define the subsurface physical distribution and structural orientation of the area. Residual gravity anomaly is also separated through the low pass filter in order to have robust interpretation. The residual anomaly indicates that the area has identical structural pattern with geological and SRTM map. The results show a pattern of high gravity index in the northeast area of ​​the study having range of 70 – 115 MGal gravity index, associated with the volcanic breccia, and a low gravity profile with less than 65 in the southwest, associated with the alluvial and water table dominated distribution. The thickness of Alluvial is determined by resistivity model with H1 at a range of 3 meters and H2 at a range of 4 m. This research is included in the potential liquefaction category with the potential for a large earthquake. UIR PRESS 2021-03-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5892 10.25299/jgeet.2021.6.1.5892 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 58 - 66 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5892/3127 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5944 2021-11-22T02:24:23Z JGEET:ART

Feasibility Study on the Application of Dynamic Elastic Rock Properties from Well Log for Shale Hydrocarbon Development of Brownshale Formation in the Bengkalis Trough, Central Sumatra Basin, Indonesia. Suranto, Ahmad Muraji Buntoro, Aris Prasetyadi, Carolus Adi Wibowo, Ricky Elastic Rock Properties Well Log Shale Hydrocarbon Brownshale Formation Geology In modeling the hydraulic fracking program for unconventional reservoir shales, information about elasticity rock properties is needed, namely Young's Modulus and Poisson's ratio as the basis for determining the formation depth interval with high brittleness. The elastic rock properties (Young's Modulus and Poisson's ratio) are a geomechanical parameters used to identify rock brittleness using core data (static data) and well log data (dynamic data). A common problem is that the core data is not available as the most reliable data, so well log data is used. The principle of measuring elastic rock properties in the rock mechanics lab is very different from measurements with well logs, where measurements in the lab are in high stresses / strains, low strain rates, and usually drained, while measurements in well logging use the principle of measured downhole by high frequency sonic. vibrations in conditions of very low stresses / strains, High strain rate, and Always undrained. For this reason, it is necessary to convert dynamic to static elastic rock properties (Poisson's ratio and Young's modulus) using empirical equations. The conversion of elastic rock properties (well logs) from dynamic to static using the empirical calculation method shows a significant shift in the value of Young's Modulus and Poisson's ratio, namely a shift from the ductile zone dominance to the dominant brittle zone. The conversion results were validated with the rock mechanical test results from the analog outcrop cores (static) showing that the results were sufficiently correlated based on the distribution range. UIR PRESS 2021-06-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5944 10.25299/jgeet.2021.6.2.5944 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 81 - 85 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5944/3293 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/5983 2022-02-16T00:35:37Z JGEET:ART

Assessment of Groundwater Quality for Drinking Purpose in an Industrial Area, Dumai City, Riau, Indonesia. Mairizki, Fitri Angga, Risti Putri Putra, Arief Yandra Groundwater Industrial Area Drinking Water COD BOD Hydologi Groundwater is the main water resource especially for daily water needs.  Population growth and urbanization have increased demand for water while the availability of groundwater has decreased both in quality and quantity. Various human activities also produce industrial, agriculture and municipal waste that can pollute groundwater through leaching process. The purposes of this study are to determine the quality of groundwater around tofu industrial factory and its evaluation for drinking water based on Health Minister Regulation No.492/MENKES/PER/IV/2010 and Government Regulation No.82 2001.The temperature, pH, total dissolved solids (TDS) and electrical conductivity (EC) were measured by using YSI-Pro. Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) were measured based on SNI 06-6989.2.2009 test method and SNI 06-698.72.2009 test method, respectively. Physically, groundwater had temperature average 28,60C, TDS 243 mg/L and EC 396 µS/cm. Almost all groundwater were acidic with pH average 5,6 and did not meet the drinking water quality requirements. Groundwater had COD average 78 mg/L, BOD average 36 mg/L and it were classified into moderate-heavy pollution. It indicated that groundwater may have been contaminated by organic material from tofu industrial wastewater. Therefore, groundwater should not be used as a source of drinking water. UIR PRESS 2020-12-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/5983 10.25299/jgeet.2020.5.4.5983 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020; 204 - 208 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/5983/2958 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6033 2024-09-28T04:24:31Z JGEET:ART

Spatial and Seasonal Variation of Doline Water Hydrochemistry in West Gunungsewu Karst Area, Yogyakarta Special Region, Indonesia Listyani R.A., T. Ridayati Doline Karst Water Hydrochemistry Variety Hydrochemistry The doline water hydrochemical study was conducted in the Gunungsewu karst area, Yogyakarta Special Region. The hydrogeological survey followed by doline water sampling was carried out in the Panggang and Wonosari-Baron Hydrogeological Subsystems. Ten selected doline water samples were taken, each in the dry and rainy season, for further physical/chemical testing in the laboratory. Research analysis includes hydrochemical analysis of several parameters such as pH, TDS, EC, major and minor ions content and assisted by difference and variability tests statistical analysis. The hydrochemical variations of doline water in the study area generally did not show any spatial variations, except for the EC parameter. Temporal/seasonal hydrochemical variations are apparent, as evidenced by differences in many variations of TDS, EC, major ions (Ca2+, Na+, K+, HCO3-, Cl-), and minor ions (sulfate and nitrate). In the dry season, the hydrochemical facies generally develop as Ca, Na-bicarbonate facies, while in the rainy season, doline water typically has Ca-bicarbonate facies. The hydrochemical of doline water may be influenced by groundwater. UIR PRESS 2024-06-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6033 10.25299/jgeet.2024.9.2.6033 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024); 195 - 204 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6033/6624 Copyright (c) 2024 Journal of Geoscience, Engineering, Environment, and Technology http://creativecommons.org/licenses/by-sa/4.0

oai:journal.uir.ac.id:article/6111 2022-02-16T00:19:36Z JGEET:CVR

Front Matter JGEET Vol. 05 No. 04 2020 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2020-12-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6111 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6111/2960 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6112 2021-05-09T22:05:46Z JGEET:BC

Back matter JGEET Vol 05 No 04 2020 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2020-12-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6112 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 4 (2020): JGEET Vol 05 No 04: December 2020 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6112/2961 Copyright (c) 2020 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6145 2021-08-29T20:09:39Z JGEET:ART

Geology, Rock Geochemistry and Ore Fluid Characteristics of the Brambang Copper-Gold Porphyry Prospect, Lombok Island, Indonesia. Idrus, Arifudin Ubaidillah, Aji Syailendra Warmada, I Wayan Maula, Syafruddin Porphyry Cu-Au Brambang Lombok Indonesia Geology Brambang is one of the porphyry copper-gold prospects/deposits situated along eastern Sunda arc. This study is aimed to understand geological framework, alteration geochemistry and ore fluid characteristics of the prospect. Fieldworks and various laboratory analyses were performed including petrography, ore microscopy, rock geochemistry, chlorite chemistry and fluid inclusion microthermometry. The prospect is composed of andesitic tuff and diorite which are intruded by tonalite porphyries. Tonalite porphyries are interpreted as ore mineralisation-bearing intrusion. Various hydrothermal alterations are identified including potassic, phyllic, propylitic, advanced argillic and argillic types. Ore mineralisation is characterized by magnetite and copper sulfides such as bornite and chalcopyrite. Potassic alteration is typified by secondary biotite, and associated with ore mineralisation. Mass balance calculation indicates SiO2, Fe2O3, K2O, Cu and Au are added during potassic alteration process. Ore forming fluid is dominated by magmatic fluid at high temperature (450-600ºC) and high salinity (60-70 wt. % NaCl eq.). Hydrothermal fluid was diluted by meteoric water incursion at low-moderate temperature of 150-400ºC and salinity of 0.5-7 wt. % NaCl eq. UIR PRESS 2021-03-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6145 10.25299/jgeet.2021.6.1.6145 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 67 - 73 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6145/3128 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6195 2022-02-03T19:13:16Z JGEET:CVR

Front Matter JGEET Vol. 05 No. 02 2020 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2021-01-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6195 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 5 No. 2 (2020): JGEET Vol 05 No 02 : June (2020) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6195/2977 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6226 2022-01-04T19:34:04Z JGEET:ART

Groundwater Effect on Slope Stability in Open Pit Mining: a Case of West Kutai Regency, East Kalimantan, Indonesia Devy, Shalaho Dina Hutahayan, Pretty Permatasari Finite Element Method Groundwater Modelling Slope Stability West Kutai mining hydrogeology The stability of open pit slopes in Biangan district, West Kutai Regency, East Kalimantan Province, is greatly influenced by groundwater conditions. The existence of groundwater reduces the shear strength of the materials which causes a decrease in the stability value of pit slopes. The main objective of this study is to assess the impact of groundwater on the stability of the low wall and high wall pit mining. Groundwater modeling is used to determine the prediction of groundwater level on the pit slope which determines the value of the slope stability. Slope stability analysis in this study was performed using the Finite Element Method, producing output in the form of strain zones, deformation and displacement values. Therefore, the Strength Reduction Factor (SRF) approach was used, which is a gradual reduction of shear strength until the values of cohesion and friction angles reach minimums and the slopes are at a critical state. Groundwater modeling results indicate that groundwater flows to the Biangan river with hydraulic heads between 76 and 108 meters above sea level. Based on the analysis using the Finite Element Method, the stability values of the pit slopes, which are influenced by groundwater, are 0.65 on the low wall and 1.40 on the high wall. The total displacements are 0.019 meters on the low wall and 0.002 meters on the high wall.  The impact of groundwater on the slope is an increase in the slope load. This increases the materials’ thrust and reduces the shear strength of the materials which reduces the rock mass that can function as a water seepage path. Thus, the recommendation for low wall pit construction is a safety factor of 7.79 with a total displacement of 0.020 meters. UIR PRESS 2021-12-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6226 10.25299/jgeet.2021.6.4.6226 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 192 - 205 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6226/3827 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6242 2022-01-04T19:33:56Z JGEET:ART

Resistivity Method for Characterising Subsurface Layers of Coastal Areas In South Sulawesi, Indonesia Rahmaniah Wahyuni, Ayusari Massinai, Muhammad Fauzy Ismullah Mun'im, Abdul Massinai, Muhammad Altin Geo-electrical Wenner configuration coastal area resistivity subsurface layers Geo-electric method The data presented in this paper are related to the characterization of a subsurface layer of coastal area in South Sulawesi. This research will fill the gap in the resistivity method study which is this method not yet use in the coastlines area, especially area influenced by seawater and coastal condition impact like South Sulawesi. The method used in this study is the method of resistivity Wenner configuration by taking the data 1-2 lines each region with lengths 45 m, 75 m, 105 m, and 120 m respectively. Data processing using non-linear least square optimization with that of the 2D inversion software Res2Dinv. The results show that the area is underlain by two layers of lithologic sections. In some sections interpreted by sandy layer, clay, sandstone, alluvium, sandy in seawater and metal minerals. From the analysis of the layers, all regions show the resistivity minimum is 0.00849 Ωm and 8.04 Ωm maximum resistivity. The result of this research can give n insight to study the large coastal area subsurface. UIR PRESS 2021-12-29 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6242 10.25299/jgeet.2021.6.4.6242 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 217 - 225 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6242/3833 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6287 2021-11-22T02:24:18Z JGEET:ART

Calcareous Nanofossil of Post-Gondwana Sequence in Southern Banda Arc, Indonesia Widiatama, Angga Jati Santy, Lauti Dwita An Nahar, Rikza Nur Faqih Zulfiah Mandiri Puteri, Winda Eka Damanik, Adrianus Kapid, Rubiyanto Calcareous Nannofossil Kolbano Sequence Banda Arc Geology Nanofossil The presence of calcareous nannofossils in samples of the Post-Gondwana sequences (Kolbano and Viqueque sequence) gives guidance about the relative age of the study area located in the Outer Banda Arc, namely Timor, Rote, and Sawu Island. The study was carried out on six traverses, Timor Island traverse (Baun and Camplong), Rote Island traverse (Termanu and Central Rote), and Sawu Island traverses (West Sawu and East Sawu). There is 29 outcrop sample prepared using the smear slide method and observed using a polarizing microscope with 1000x magnification. The results of the study showed the presence of Cretaceous, Paleogene, and Neogen-Quarternary calcareous nannofossil. There are 82 species from 14 families identified in the post-Gondwana sequence. The results showed that the assemblage of calcareous nannofossil in Cretaceous characterized by the presence of Watznaueria fasciata, Watznaueria cynthae, Cyclagelosphaera brezae, Orastrum campanensis, and Micula concava. The assemblage of Paleogene calcareous nannofossil characterized by the presence of Coccolithus staurion, Chiasmolithus solitus, Discoaster minimus, Tawelus (?) magnicrassus, Chiasmolithus bidens, Prinsius africanus, Cyclicargolithus luminus, Spenolithus elongatus, Reticulofenestra umbilica, Cruciplacolithus vanheckae, and Helicospharea seminulum, and the assemblage of Neogene calcareous nannofossil characterized by the presence of Reticulofenestra pseudoumbilica, Discoaster quinqueramus, Helicosphaera princei, and Discoaster pansus. Quarternary calcareous nannofossil characterized by the presence of Ponthospaera indooceanica. UIR PRESS 2021-06-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6287 10.25299/jgeet.2021.6.2.6287 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 86 - 93 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6287/3294 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6368 2021-08-29T20:09:39Z JGEET:ART

Hydrothermal Alteration and Ore Metal Mineralisation at Temon, Pacitan, East Jawa, Indonesia. Mulyaningsih, Sri Sukisman, Yoyok Ragowo Siswomijoyo Hidayah, Radhitya Adzan zonation alteration hydrothermal mineralization ore Cu-Fe Pacitan area is known as Tertiary volcanic arc in Java, as the result of subduction zone of the Indian-Australian Plate beneath the Eurasian Plate since Oligocene. It was superimposed volcanism which formed a wide area of hydrothermal alteration zone, resulting potential ore metals mineralization, such at Temon and its vicinities, Pacitan Regency, East Java Province, Indonesia. The aim of study was to analyze hydrothermal alteration and ore metal mineralization zones. Method was surface mapping, thin section analyses, mineragraphic analyses and X-Ray Diffraction (XRD) analyses. Field study observed denuded and deformed volcanic crater geomorphology. There are ore placer deposits within the sand dunes of Grindulu River, which it consists of andesitic lava and breccia of Early Oligocene Mandalika Formation; Early Miocene lithic and vitric tuffs; and dacitic intrusion. The dikes of dacite as the last of volcanism was the host rock controlling the zonation of alteration and mineralization stages. Oblique normal faults and shear faults were cross over dilating formed fractures, which were as bodies to depositing the ore metals. There are (zone 1st) the argillic clay consists of quartz+alunite+dickite+kaolinite±illite with vuggy structures, (zone 2nd) the argillic clay consists of quartz+montmorillonite±illite zone with quartz vents, brecciated and sulfide massive, and (zone 3rd) as the chloritized zone with low grade and supergene on the edge of hydrothermal alteration. It was fluid overprinted that very acid to the core of zone 1st (pH2-4) into more netral pH 4-6 (zone 2nd) and (pH5-6) in the edge zone 3rd. The potentials ore metal mineralization are Fe and Cu by pyrite, chalcopyrite, hematite, and covellite. Other potential ore metal mineralization was also from enargite by the supergene alteration. UIR PRESS 2021-03-24 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6368 10.25299/jgeet.2021.6.1.6368 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021); 24 - 33 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6368/3121 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6395 2022-10-10T01:18:18Z JGEET:ART

Rapid Land Cover Change in The South Sumatera Peat Area Associated With 2015 Peat Fires Putra, Raden Nufutomo, Tastaptyani K Lisafitri, Yuni Sari, Novi K Zurfi, Alfian Lestari, Deni O Nuha, Muhammad U Abstract Peat Fire NDVI Burned Area Degradation GIS The peat fire events in Indonesia, particularly the South Sumatra area, changed the appearance of surface vegetation. The fires usually occur during the dry season from July to October. This study aims to evaluate land cover changes due to 2015’s peat fire in the South Sumatra peatlands. Remote sensing techniques using a Normalized Difference Vegetation Index (NDVI) method were used to identify the change of vegetation density in the study area. The results showed that 69% of the total South Sumatra peatland was burned due to the 2015 peat fire event. The level of vegetation density was considerably decreased by fire events. The degradation in the burned area was dominated by land cover class of ferns/shrub. The Peat fires during the observation period have a negative impact on the peat ecosystem, so improvements are needed in peatland management practices. Improvements need to be made in fire prevention and management practices, as well as restoration of burnt land. UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6395 10.25299/jgeet.2022.7.1.6395 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022); 34 - 38 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6395/4065 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6424 2021-11-22T02:24:15Z JGEET:ART

Characteristics of Chromite Deposits at North Kabaena District, Bombana Regency, Southeast Sulawesi Province, Indonesia Hasria Masri Asfar, Suryawan Arisona Okto, Ali Restele, La Ode Ngkoimani, La Ode Yustika, Rika Chromite peridotite serpentinite olivine podiform Geology The study area is located in North Kabaena District, Bombana Regency, Southeast Sulawesi. This paper is aimed to describe characacristics of chromite deposits.  This study is conducted in three stages, three stages including desk study, field work and laboratory analysis. Desk study mainly covers literature reviews. Field work includes mapping of surface geology and sampling of representative rocks types. Laboratory analysis includes the petrologic observation of handspecimen samples, petrographic analysis of the thin section and ore microscopy for polished section. The results of petrographic analysis show that olivine minerals are generally replaced by minerals orthopyroxene and has been alterated by lizardite type serpentine veins with a fractured structure. The mineral olivine is also replaced by the mineral chrysotile as a secondary mineral with a fibrous structure. Based on ore microscopy analysis show that chromite has generally experienced a lateritification process and has been replaced by magnetite, hematite and geotite minerals. Chromite has experience process of weathering and alteration from its source rock caused by tectonics that occurred in the study area. The results shows that the characteristics of chromite deposits in North Kabaena District Chromite deposits has generally encountered in peridotite rock which have a grain size of 0.3-20 cm. Furthermore, chromite deposits in the study area are also encountered in podiform deposits, distributed locally and shows podiform to tubular shape with the dimensions of 30-60cm. UIR PRESS 2021-06-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6424 10.25299/jgeet.2021.6.2.6424 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021); 94 -98 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6424/3295 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6620 2021-08-29T20:09:39Z JGEET:CVR

Front matter JGEET Vol 06 No 01 2021 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2021-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6620 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6620/3136 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6621 2021-08-29T20:09:39Z JGEET:BC

Back matter JGEET Vol 06 No 01 2021 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2021-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6621 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6621/3137 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6643 2022-10-10T01:20:55Z JGEET:ART

Serpentinization Study On Ultramafic Rock at Morombo Area, Lasolo Islands District, North Konawe Regency, Southeast Sulawesi, Indonesia Hasria Febiyanti Masri Okto, Ali Hasan, Erzam S. Hamimu, La Sawaludin Iradat Salihin, La Ode Muhammad Wahab Serpentine Serpentinization Ultramafic Morombo Geology The research is in Morombo area, North Konawe Regency, Southeast Sulawesi. The purpose of this study was to determine the characteristics of serpentinized ultramafic rock and serpentine paragenesis. Research was conducted using  field observations and laboratory analysis consisting of petrographic and geochemical analysis  in the form of X-Ray Fluorosence (XRF). Petrographic analysis was carried out to identify the mineral content and textures in the rock and to determine the percentage of serpentine mineral presence. Both of these rocks are petrographically dominated by primary minerals olivine and clinopyroxine and secondary minerals namely lizardite, chrysotile, antiorite and opaque minerals. The XRF analysis was to determine the elements of Ni, Fe, Co, MgO, SiO2, CaO, Al2O3 and P in ultramafic rocks. The results of petrographic analysis show that serpentinized ultramafic rocks in the study area consist of serpentinized dunite and serpentinized peridotite. The formation of clay minerals in rocks does not occur because of the low serpentinization process in the rock. The results of XRF analysis showed that all samples in the bedrock showed Ni content above 0.2%. This is caused by the enrichment of Ni which is interpreted as a result of the serpentinization process along with the formation of lizardite in the rock. The serpentinization sub-processes in the study area comprised by hydration, serpentine recrystallization, and deserpentinization. Serpentine paragenesis is formed from the mid-oceanic ridge ocean floor, the orogenic phase to weathering. Substitution of Mg by Ni in ultramafic rocks will produce Ni-Serpentin. It is estimated that in the research area lizardite and chrysotile lizardite and chrysotile are the causes of Ni enrichment in bedrocks. The serpentinization characteristics of ultramafic rocks in the study area show a low to moderate level of serpentinization. UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6643 10.25299/jgeet.2022.7.1.6643 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022); 15 - 20 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6643/4060 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6644 2021-11-22T02:23:52Z JGEET:ART

Total Organic Carbon (TOC) Value Prediction in Source Rock Potential at North East Java Basin, Indonesia Manurung, Paulus Leonardo Wibowo, Rahmat Catur Dewanto, Ordas TOC Correlation Passey method Basin This research aims to determine the potential of the source rock in the Kujung and Cepu Formations in the North East Java Basin, using Total Organic Carbon (TOC). TOC is calculated using the Passey method. The Passey method is used by overlaying the sonic log and the resistivity log and determining the baseline to get the separation of Δlog resistivity, which is then used to predict the TOC log by including the LOM (Level of Organic Maturity) variable obtained from the data of vitrinite reflectance. After the TOC log value is obtained, a correlation is made with the TOC core value. The prediction result of TOC log in a PM-1 well is 2.16%, which means it has excellent quality. The prediction of TOC log in a PM-2 well is worth 2.68%, which means it has excellent quality. The correlation value between the TOC log and the TOC core of the PM-1 well is 0.67, which means the correlation is strong. In PM-2 well, the correlation between the TOC log and TOC core is 0.92, which means that the correlation is robust. UIR PRESS 2021-09-20 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6644 10.25299/jgeet.2021.6.3.6644 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 147 - 151 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6644/3568 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6753 2021-11-22T02:23:46Z JGEET:ART

Geomorphosite Assessment at North Karangsambung -Karangbolong Geopark Kebumen, as Tools of Geotourism Development Ansori, Chusni Warmada, I. Wayan Setiawan, Nugroho Imam Yogaswara, Herry Geopark Karangsambung Geomorphosite Pentulu Indah Wagirsambeng Asessment geoheritage geotourism Geopark is a sustainable regional development concept that combines geological, biological, and cultural diversity through conservation and education activities to improve the community's welfare. Kebumen Regency has a National Geopark Karangsambung-Karangbolong (GNKK) covering 543,599 Km2 with 41 geosites, ten cultures, and eight biosite since 2018. The northern part of the area is a geological heritage that is widely used for field geological education. The study aims to identify and assess geosites and geomorphosite in the north area, describing the region's geomorphological processes and geological evolution. Field research was conducted to get an overview of geological diversity, geomorphology, and geosite and determine the selected geomorphosite. Geomorphosite assessment is done quantitatively using the Kubalikova method by assessing five main parameters that include; Intrinsic and scientific value, the value of education, economic value, conservation value, and added value. The scientific and intrinsic value of Pentulu Indah (PI) = 4, while Wagirsambeng = 3. Educational value of PI = 4, while Wagirsambeng = 2. Economic value is still not satisfactory, but P.I. = 2, while Wagirsambeng = 1.5. Conservation value of P.I. = 3.5, while Wagirsambeng = 2.5. Added value PI = 2.75 while Wagirsambeng = 1.5. Based on those, geomorphosite Pentulu Indah is 16,26 point or a good value (87.83 %) while Wagirsambeng is 10.5 point or fairly level (56.75 %). UIR PRESS 2021-09-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6753 10.25299/jgeet.2021.6.3.6753 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 164 - 171 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6753/3572 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/6780 2021-11-22T02:23:43Z JGEET:ART

Biometric similarity Test of The Population of T. (Zaria) bantamensis tjicumpaensis with T. (Zaria) javana as a Form of Phylogeny And Evolutionary Proximity Pandita, Hita Apriani, Ani Biometrical Zaria Turritellidae T-Test morphological Geology Biometric aspects in the Turritellidae family need to be studied as an important identification parameter. Zaria, which is one of the sub genera in the Turritellidae family, deserves to be tested in order to determine the feasibility of the biometric aspect as an identification parameter. This paper aims to provide an overview of the benefits of the biometric aspect as an identification parameter. The method used to re-identify the biometric and morphological aspects of the T. (Zaria) bantamensis tjicumpaensis population with T. (Zaria) javana. The results of the identification were carried out by a T-Test on the biometric aspect to see the similarity of the biometric aspects of the two populations. Based on the results of the T-Test on the parameters of the Wsut: Wang and Wsut: L ratio, it shows that the two Zaria species are the same. Meanwhile, from the morphological aspect, there is a slight difference in the early growth peripherals. UIR PRESS 2021-09-22 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/6780 10.25299/jgeet.2021.6.3.6780 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 172 - 176 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/6780/3573 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7066 2022-10-10T01:15:47Z JGEET:ART

Laboratory Study On The Utilization of Jackruit Skin Waste Into Car-boxymethyl Cellulose and Their Effect On The Rheological Properties Of Drilling Mud Novrianti, Novrianti Novriansyah, Adi Khalid, Idham Amani, Zata Dini Carboxymethyl Cellulose (CMC) Jackfruit Skin Drilling Mud The value rheology of drilling mud must be in accordance with the conditions of wellbore that do not lead to the occurrence of the problems at the time of drilling.  One of the efforts to improve the rheology of drilling mud is by adding Carboxymethyl Cellulose (CMC) which is useful for increasing viscosity and binding water. This study aims to identify the effect on the use of CMC originating from jackfruit skin to the rheological properties of drilling mud. Jackfruit skin is an underutilized organic waste and the structure of jackfruit skin contains 50-55% cellulose. Manufacturing phase of synthesizing CMC skin jackfruit includes the process of delignification, alkalization, carboximetilation, and sieve sample to be powdered CMC and subsequently carried out the test of plastic viscosity, yield point , gel strength by using a Fann VG Meter and mud cake using a marsh funnel and volume filtration using a filter press . The added mass of CMC jackfruit skin were varied from 1 g, 2 g, 3 g, 4 g to 5 g. The results suggest that the addition of jackfruit skin CMC has an effect on the rheology of drilling mud. Increasingly many additions additive CMC skin jackfruit who use the increasingly high- value rheology mud drilling were obtained. Furthermore, the addition of CMC jackfruit skin starting from 1gr – 5 gr meets the API 13, a standard for the value of yield point/viscosity plastic, plastic viscosity and maximum volume of filtrate. While the value of gel strength which meets the API 13 A is with the addition of CMC jackfruit skin as much as 5 grams. UIR PRESS 2022-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7066 10.25299/jgeet.2022.7.2.7066 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 2 (2022): JGEET Vol 07 No 02 : June (2022); 59 - 68 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7066/4362 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7189 2022-01-04T19:34:11Z JGEET:ART

The Transitional Gabbroic Rocks in Bayah Geological Complex, Western part of Java, Indonesia, Inferred from XRF, ICP-MS, and Microprobe Analysis Patonah, Aton Permana, Haryadi Syafri, Ildrem Bayah geological complex (BGC) Ciletuh melange complex (CMC) Gabbro REE Arc tectonic setting Retrograde metamorphism Igneous rocks Gabbro, is a fossil remnant of oceanic crust in western part of Java, found at Bayah Geological Complex (BGC) and Ciletuh Melange Complex (CMC), Indonesia. It has been studied by using petrographic, X-Ray Fluorescence (XRF), and inductively coupled plasma-mass spectrometry (ICP-MS) and mineralogical (microprobe) analyses. Mineral and geochemical composition of these rocks provide important clues to their origins since the rocks have been deformed and gone through auto metamorphism, beside they contain the economic mineral and or rare earth elements (REE). Gabbroic rocks in these two areas generally shows phaneritic to porphyritic texture, granular texture. These rocks in CMC are dominated by plagioclase (oligoclase to albite), hornblende, pyroxene, partly altered to tremolite, actinolite, chlorite, epidote, and sericite; meanwhile those of BGC dominantly consist of plagioclase, pyroxene, hornblende, some present of chlorite, actinolite, epidote and biotite as secondary minerals. In multi-element diagrams, gabbroic rocks in CMC show strong negative Sr and Zr, but positive Nb anomaly, while those of BGC show strong negative anomaly of Nb and Zr. In addition, based on rare earth elements (REE) diagrams, gabbroic rocks in CMC show depleted of light rare earth elements (LREE) with negative Eu anomaly, while gabbro’s in BGC show enrichment of LREE. These characteristics indicate that GBC’s and CMC’s gabbroic rocks came from different magma sources, one was formed by partial melting of depleted upper mantle reservoir while the other one was formed by partial melting of mantle wedge with active participation of subducted slab in an arc tectonic setting, suprasubduction zone which were formed at started Upper Cretaceous to Paleogene, and they had retrograde metamorphism to epidote amphibolite facies. UIR PRESS 2021-12-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7189 10.25299/jgeet.2021.6.4.7189 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 177 - 183 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7189/3823 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7293 2022-10-10T01:21:49Z JGEET:ART

Clean Water Supply in Tasikmalaya Municipality, Opportunities and Challenges Permana, Sulwan Susetyaningsih, Adi Fadli, Dicky Muhamad Ciwulan-Cibeuti Dependable flow NRECA Calibration GIS Currently, there are three sub-districts in Tasikmalaya City that are still vulnerable to clean water, namely Kawalu, Tamansari, and Cibeureum sub-districts. PDAM Tirta Sukapura, owned by the Tasikmalaya Regency Government, has not been able to meet clean water needs, so the Tasikmalaya Municipality Government plans to build a new PDAM as an alternative. The Ciwulan river in Cibeuti Village is a source of water that will be used as a collection point. Rain data was taken from 2 stations, namely Gunung Satria and Cikunten II stations, for ten years. The evapotranspiration value was calculated using the Penman-Monteith method. The calculation of the discharge in the intake area, namely Ciwulan-Cibeuti with a watershed area of ​​405 km2, used the NRECA method using parameters taken from the calibrated Ciwulan-Sukaraja station. The calibration parameters are PSUB = 0.86; GWF = 0.22, reduction coefficient = 0.80; and NSE = 0.764. The determination of the dependable flow is calculated using the Weibull method. The magnitude of the Q90's dependable flow is 4.3 m3/s. The projected population for the next 15 years is estimated at 307,857 people, so the amount of water needed is around 0.535 m3/s. Opportunities for business entities to participate in building PDAM are wide open, with the certainty of return plus profits or independent management by business entities within a certain period of time. The challenge for the government and business entities is to provide reasonable prices to customers and new networks. UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7293 10.25299/jgeet.2022.7.1.7293 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022); 1 - 6 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7293/4058 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7295 2021-07-06T22:08:54Z JGEET:CVR

Front matter JGEET Vol 06 No 02 2021 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2021-07-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7295 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7295/3373 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7296 2021-07-06T22:08:54Z JGEET:BC

Back matter JGEET Vol 06 No 02 2021 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2021-07-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7296 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7296/3374 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7417 2021-11-22T02:23:49Z JGEET:ART

Comparison of Granitoid Characteristics West Kalimantan and Karangsambung Based On Mineralogical And Geochemical Aspects Adi Nugroho, Kevin Setyo Setiawan, Iwan Winarno, Tri Granite Mineralogy Geochemical Petrogenesis West Kalimantan Karangsambung Mineralogy Geochemical Indonesia was included in the ring of fire so that it has various types of tectonic products, one of which is granitoid. Granitoid is  very complex rock and many are found in Indonesia. Some of them are found in West Kalimantan and Karangsambung. Basis of the reasearch is there is no research that compares granitoid in two regions. The purpose of this study was to compare rock characteristics and granite petrogenesis of West Kalimantan and Karangsambung. The research method used was collecting data on field, also laboratory analysis of rock samples using a polarization microscope, refraction microscope, and X-Ray Fluorescence analysis. The mineralogical characteristics of each study area tend to be almost the same. The predominant composition of the main minerals is quartz, plagioclase and orthoclase. But specifically the rock samples from West Kalimantan have been altered from phylic-silicification-propylitic. The entire study area contained accessory minerals, namely apatite, zircon, titanite, and for monazite only in the West Kalimantan sample. There was mineralization up to the supergene stage in the presence of the characteristic minerals for the supergene covelite and chalcocytes in the West Kalimantan sample. Geochemical analysis of both regions shows the same magma affinity, namely Calc Alkaline - High K Calc Alkaline. For West Kalimantan, the value of A / CNK <1.1 has a type metaluminious and > 1.1 a type peraluminious. Meanwhile, Karangsambung A / CNK value <1.1 has a type metaluminious. So that West Kalimantan granite has two I-type and S-type. While Karangsambung is I-type. West Kalimantan granite is formed in continental arc granite (CAG) and continental collision granite (CCG). Meanwhile, Karangsambung in Volcanic Arc Granite (VAG). It can be concluded that the granites of the two regions have quite different characteristics even though they belong to a relatively similar tectonic environment. UIR PRESS 2021-09-21 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7417 10.25299/jgeet.2021.6.3.7417 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021); 152 - 163 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7417/3571 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7448 2022-10-10T01:21:20Z JGEET:ART

Identification of Geothermal System In “Diana” Area, Indonesia Based On Magnetotelluric Data Modelling Alpine, Fajar Yatini, Y. Takodama, Iqbal Geothermal System Inversion Magnetotelluric Resistivity Geothermal These days, the number of geothermal explorations is being increased to obtain a greater new potential of geothermal energy. One of the methods that is often used is magnetotelluric (MT). By MT, the components of a geothermal system can be delineated based on the resistivity values. This research’s main purpose is MT data modelling in 1 D and 2 D to delineate the geothermal system in the research area. There are 18 point of soundings, with a distance of about 1 – 3 km for each point. Bostick Transformation is used in 1 D modelling while Non-Linear Conjugate Gradient inversion is used as 2 D modelling with L – curve analysis as a method to obtain an optimal value of regularization parameter. Based on the analysis of 1 and 2 D models, the caprock zone was identified with a resistivity value of < 50 Ωm at a depth of 500 m with a thickness of about 250 m. The reservoir zone was identified with a resistivity value range of (50 – 100) Ωm located at a depth of 1000 with a thickness of about 500 m. Also, fault structures have been identified at the center of the research area. The regularization parameter used for the 2 D modelling is 5, which has obtained RMS values of 2.25% and 2.21% for each line. UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7448 10.25299/jgeet.2022.7.1.7448 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022); 7 - 14 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7448/4059 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7646 2022-10-10T01:22:18Z JGEET:ART

Diagenesis Study of Jatiluhur Formation at Cipamingkis River, Bogor Regency, West Java, Indonesia Aulia, Intan Aditiyo, Rezky Diagenesis features Diagenesis history Jatiluhur Formation Petrography XRD SEM Geology Diagenesis studies in the Jatiluhur Formation are still relatively new, especially in the Cipamingkis River. This research can provide information in the form of components and characteristics of sandstone in the Jatiluhur Formation which can be used as a basis for further research or useful information in the oil and gas industry. Knowledge of diagenetic could be one of the factors that affect in raservoir quality, espesially in sandstone. In this study, data collection was carried out through surface mapping, which is 55 rock samples were obtained from stratigraphic measuring section with a path length of ±2 Km in the Cipamingkis River. The data is in the form of information on sedimentarry structure, textures and composition. There were 23 sandstone and 2 limestone samples which were then subjected to petrographic analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results of study are several features of diagenesis were found including compaction that works in the form of point contact, long contact, concavo-convex contact and suture contact and dominated by mechanical compaction, while in limestone there is a brittle fracture feature in bioclasts. The cement found in the form of calcite cement, quartz and clay minerals that the form of kaolinite, smectite and illite, while the limestone is in the form of blocky and fibrous to bleded which is filled with calcite minerals. Dissolution occurs in the minerals of quartz, feldspar, and mica. The mineral replacement that is commonly found occurs in quartz and feldspar minerals. In limestone, there is an intergranular micritization. The dominant type of porosity found was interparticle with an average of 10.4% found between 3 – 23%. The history of diagenesis that occurs in rocks in the Jatiluhur Formation begins with the initial deposition of eogenesis, followed by burial mesogenesis and ends with telogenesis which reveals rocks on the surface. UIR PRESS 2021-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7646 10.25299/jgeet.2021.6.4.7646 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 255 - 262 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7646/3852 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7692 2022-01-04T19:33:52Z JGEET:ART

Carbon Dioxide (CO2) Emissions Due to Motor Vehicle Movements in Pekanbaru City, Indonesia Sari, Erza Guspita Sofwan, Muhammad Land Use Carbon Dioxide Emission (CO2) Vehicle Kilometer Traveler (VKT) Motor Vehicles Travel Behavior Emission Factors GIS Land use has a very close relationship with transportation. Transportation is formed as a result of the interaction between land use and its support system. Good land use supported by good infrastructure will result in good movement as well. Accessibility is one of the supporting factors for good interaction between transportation and land use—the better the land use conditions in an area, the greater the movement in that area. However, the interaction between land use and transportation can cause one of the problems: the increase in carbon dioxide emissions due to the more significant movement of motorized vehicles. Motor vehicles are the most significant contributor to carbon dioxide (CO2) emissions in the world. The further the route traveled by motorized vehicles, the more carbon dioxide (CO2) emissions will increase. This study aims to analyze the average total emission of carbon dioxide (CO2) resulting from transportation activities in Pekanbaru City into two parts, namely: (1) Based on Travel Time (2) Based on the type of vehicle. Vehicle Kilometers of Travel (VKT) and Emission Factors are the primary data in calculating Carbon Dioxide (CO2) Emissions. The research area consists of 12 zones involving 1,342 households in Pekanbaru City. Based on travel time, 52% of community motorized vehicle movement activities are carried out in the morning. Private cars contribute 65% of carbon dioxide (CO2) emissions in Pekanbaru City based on the type of vehicle. This study found that a high number of motorized vehicles cannot be used as a benchmark that the resulting emissions will also be high. However, the emission of carbon dioxide (CO2) depends on the fuel consumption of each vehicle. The higher the fuel consumption, the higher the amount of carbon dioxide (CO2) emissions released by motorized vehicles. UIR PRESS 2021-12-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7692 10.25299/jgeet.2021.6.4.7692 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 234 - 242 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7692/3844 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7726 2022-01-04T19:33:42Z JGEET:ART

Fluid Inclusion Study of Epithermal Quartz Veins from the Kyaukmyet Prospect, Monywa Copper-Gold Ore Field, Central Myanmar Oo, Toe Naing Harijoko, Agung Setijadji, Lucas Donny Kyaukmyet epithermal quartz veins fluid inclusions formation temperature paleo-depth Monywa copper-gold ore field Minerals The Kyaukmyet prospect is located near the main ore bodies of the Kyisintaung and Sabetaung high-sulfidation Cu-Au deposits, Monywa copper-gold ore field, central Myanmar. Lithologic units in the research area are of mainly rhyolite lava, lapilli tuff and silicified sandstone, mudstone and siltstone units of Magyigon Formation which hosted to be polymetallic mineralization. Our field study recorded that epithermal quartz veins are hosted largely in rhyolite lava and lapilli tuff units. Those quartz veins show crustiform, banded (colloform), lattice bladed texture and comb quartz. The main objectives of the present research in which fluid inclusion studies were considered to conduct the nature, characteristics and hydrothermal fluids evolution from the epithermal quartz veins. In this research, there are three main types of fluid inclusions are classified according to their phase relationship (1) two-phase liquid-rich inclusions, (2) the coexisting liquid-rich and vapor-rich inclusions, and (3) only vapor-rich inclusions. Microthermometric measurements of fluid inclusions yielded homogenization temperatures (Th) of 148–282 °C and final ice-melting temperature (Tm)  of -0.2°C to -1.4°C . The value of (Tm) are equal to the salinities reaching up 0.35 to 2.07 wt % NaCl equiv. respectively. Estimation formation temperature of the quartz veins provide 190°C and 210°C and paleo-depth of formation are estimated to be between 130m and 210m. Petrography of fluid inclusion and microthermometric data suggest that fluid boiling as well as mixing processes were likely to be happened during the hydrothermal fluid evolution at the Kyaukmyet prospect. According to the characteristics of many parameters including petrography of fluid inclusion, microthermometric data, paleo-depth, evidence of quartz vein textures and types of hydrothermal alteration from the Kyaukmyet prospect allows to interpret these data to be the low-sulfidation epithermal system. UIR PRESS 2021-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7726 10.25299/jgeet.2021.6.4.7726 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 248 -254 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7726/3851 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7744 2022-01-04T19:34:08Z JGEET:ART

Interpretation of Subsurface Fault Through Multi-Level Second Vertical Derivative Gravitational Data in Bittuang Geothermal Working Area, South Sulawesi, Indonesia Gunadi Putra, Ullil Jhanesta, William Iskandarsyah Gravity ML-SVD Structure Geothermal The research was conducted in Bittuang, Tana Toraja Regency, South Sulawesi Province, as one of the geothermal prospect areas and targets for the initial stage of the Government exploration drilling program for the 2020-2024 period. One aspect of geothermal is the manifestation control structure as a fluid migration path from below the surface. Therefore, identification of existing structures in the Bittuang geothermal area was carried out and confirmed the surface geological structure contained in the Bittuang geothermal geological map. In determining the presence of a fault and knowing its characteristics such as the type of fault, the direction of the dip, and the magnitude of the dip of the fault, the gravity data is processed using the multi-level second vertical derivative (ML-SVD) method. To strengthen the interpretation, the results from the ML-SVD were matched with the data from the horizontal gradient (HG) method and the geological data of the structure of the study area. From this process, there are 27 faults in the Bittuang geothermal area, two of which are indicated as controlling faults for the manifestation of the Balla group and the Cepeng group. This research is expected to describe faults in the Bittuang geothermal area, which can support detailed exploration activities. UIR PRESS 2021-12-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7744 10.25299/jgeet.2021.6.4.7744 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 184 - 191 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7744/3824 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7788 2021-09-30T00:48:49Z JGEET:CVR

Front matter JGEET Vol 06 No 03 2021 (J. Geoscience Eng. Environ. Technol.), JGEET       UIR PRESS 2021-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7788 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7788/3585 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7790 2021-09-30T00:48:49Z JGEET:BC

Back matter JGEET Vol 06 No 03 2021 (J. Geoscience Eng. Environ. Technol.), JGEET       UIR PRESS 2021-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7790 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 3 (2021): JGEET Vol 06 No 03 : September (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7790/3586 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/7889 2022-01-04T19:34:00Z JGEET:ART

Understanding Mud Volcano System Using Hele-Shaw (H-S) Experiment: Seismic Confirmation at East Java Mud Volcano Burhannudinnur, Muhammad Noeradi, Dardji mud volcano system Hele-Shaw overpressured valve fault critical phase Geology Numerous researchers have carried out studies on the mud volcano system in East Java. However, there have been no experiments on the mud volcano system's mechanism, including overpressure confirmed by direct subsurface data. Therefore, this study aims to directly evaluate the mud volcano system's mechanism using the Hele-Shaw (H-S) experiment with the subsurface data confirmation. The H-S experiment utilized four primary materials: quartz sand diameter below 250 µm and 320 µm to analogize the porous layer. Gypsum flour clay is the ductile layer, while mud from the Kuwu and Kesongo Mud Volcanoes is the original material from nature. Wax represents impermeable material. The sealing layer is made of wax, and oxygen represents the natural fluids of the rock formation. The overpressured zone is created by pumping oxygen into a layer of quartz sand covered by a wax as an impermeable layer. Pressure is measured digitally, and the process is continuously recorded to produce traceable data. Each material was experimented on individually to determine the critical phase characteristics, valve fault structure geometry, and validation with seismic interpretation. The results indicate that the critical phase of the mud volcano system is characterized by the dome structure at the surface, with high intensify of gas and oil seepage. Piercement structure geometry is shown by plumbing of fluidization zone, which becomes shallower than before. Furthermore, each material's piercement structure geometry shows a consistent pattern, with differences in the density of the fault and pressure structures. Thus, the H-S experiment's validation with seismic interpretation shows a similar geometry in pressure structures and valve faults as the mud volcano system's migration paths. UIR PRESS 2021-12-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/7889 10.25299/jgeet.2021.6.4.7889 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 206 - 216 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/7889/3828 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/8085 2022-10-10T01:11:23Z JGEET:ART

Application of Lineament Density Extraction Based on Digital Elevation Model for Geological Structures Control Analysis in Suwawa Geothermal Area Manyoe, Intan Noviantari Hutagalung, Ronal Model Geothermal Geology Lineament Structure Lineament Geothermal The tectonic condition of Gorontalo, which is located in the north of Sulawesi Island has implications for the spread of geothermal potential. The area in Gorontalo with the largest geothermal potential is the Suwawa area, Bone Bolango Regency. Therefore, this study aims to develop a model of lineament extraction from a digital elevation model and analyze the geological structure control based on the lineament distribution. This research is useful for the development of knowledge in the geothermal field, especially the study of permeability and structural control in geothermal areas. This research is beneficial for the community because it can detect the permeability zone in more detail which is the basis for the utilization of geothermal potential. The factors studied in this study are the geological lineament density and the geological structures. To achieve the research objectives, extraction methods and model analysis include analysis of permeable and control of geological structures. The lineament extraction model from the digital elevation model in the Suwawa geothermal area shows that there is a moderate to high agreement for lineament extraction from NATIONAL DEM data and low to moderate agreement for lineament extraction from SRTM data. The lineament distribution showing moderate to high density occupies the southern, eastern, and western parts of the Suwawa geothermal area. The presence of a lineament controls the circulation of geothermal fluids in the Suwawa geothermal area. UIR PRESS 2022-09-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8085 10.25299/jgeet.2022.7.3.8085 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 3 (2022): JGEET Vol 07 No 03 : September (2022); 117 - 123 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8085/4600 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/8136 2022-11-08T18:29:23Z JGEET:ART

Hydrogeochemical and Characteristics of Groundwater in Teluk Nilap Area, Rokan Hilir, Riau Mairizki, Fitri Yandra Putra, Arief Adiza Putri, Widya Ferdyansyah Hydrogeochemical groundwater type groundwater facies stiff diagram piper diagram Hydrologi Groundwater plays important role as the main water resource for human needs. The vulnerability of groundwater to contaminants both naturally and by human activities can be not avoided as a trigger for groundwater quality degradation. Hydrogeochemical become important highlights in groundwater studies because groundwater conditions in quality and quantity influenced by the geological formation of rock minerals in aquifer. Naturally, the condition of the research area which consists of peat swamps can also affect the characteristics of groundwater. The aims of this research are to determine groundwater types and groundwater facies in study area with an analytical approach using stiff diagram and piper diagram. The method used was purposive sampling by collecting data from dug wells at the research site. 5 samples from dug wells were used as representatives in the groundwater facies analysis. The groundwater facies analysis was carried out by measuring the concentration of major ions such as Na, K, Ca, Mg, Cl, SO4, and HCO3. The highest groundwater level was in the northern part of study area (7,84 m) while the lowest groundwater level was in the southwest part of study area (2,05 m). The results showed three types of groundwater based on stiff diagram as sodium chloride (NaCl), sodium sulfate (NaSO4) and magnesium sulfate (MgSO4). The lithology conditions that composed the aquifer affected the facies or origin of groundwater. The alluvium layer in the research area which rich in sodium (Na+) minerals with chloride (Cl-) or sulfate (SO42-) anions forms chloride sulfate facies (Cl+SO4) which were located in the middle to the south of the study area and sodium (potassium) chloride (sulfate) facies (Na(K)Cl(SO4)) which were distributed in the northern part of study area. UIR PRESS 2021-12-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8136 10.25299/jgeet.2021.6.4.8136 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021); 243 - 247 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8136/3846 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/8180 2022-10-10T01:18:58Z JGEET:ART

Characteristics of Kedondong Trass and Bobos Trass as Cement Raw Material, Cirebon, West Java, Indonesia Marin, Jenian Winarno, Tri Fairuz, Shofiana Nadia Trass Supplementary Cementitious Material (SCM) Pozzolanic Cement Cirebon Geology The use of cement materials in construction continues to increase every year, consumes lots of raw material and emits CO2 from clinker production. To eliminate this negative effect, alternative materials are needed. Trass is natural pozzolan which is formed from silica-alumina rich volcanic rocks. As supplementary cementitious material, trass is sufficiently durable and reduce clinker proportion in cement mixture, thus more environmentally friendly. This research aims to determine characteristics and composition of Kedondong trass and Bobos trass, Cirebon, West Java as raw material for pozzolan cement. The study was conducted using petrography and XRD analysis to determine mineralogy of rocks. XRF analysis was carried out to determine chemical composition as well as other tests to determine trass quality. Kedondong trass is originated from andesite intrusion and andesitic breccia, while Bobos trass is formed from hypersthene-andesite intrusion. Based on mineralogy analysis, trasses have similar mineral composition consist of plagioclase, quartz, pyroxene, hornblende, and sanidine. XRD analysis shows abundance of cristobalite and tridymite from each samples. This mineralogy is confirmed by geochemistry result, which is the samples contain more than 70% SiO2 + Al2O3 and less than 4% SO3. Other chemical characteristics that have been tested are moisture content, ignition loss, and clay content in which all of those parameters meet the industrial standard for cement material. UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8180 10.25299/jgeet.2022.7.1.8180 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022); 27 - 33 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8180/4062 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/8554 2021-12-31T09:47:11Z JGEET:CVR

Front matter JGEET Vol 06 No 04 2021 (J. Geoscience Eng. Environ. Technol.), JGEET - UIR PRESS 2021-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8554 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8554/3853 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/8555 2021-12-31T09:47:11Z JGEET:BC

Back matter JGEET Vol 06 No 04 2021 (J. Geoscience Eng. Environ. Technol.), JGEET      UIR PRESS 2021-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8555 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8555/3854 Copyright (c) 2021 Journal of Geoscience, Engineering, Environment, and Technology

oai:ojs.pkp.sfu.ca:article/8558 2022-02-10T19:29:20Z JGEET:ART

oai:journal.uir.ac.id:article/8863 2022-10-10T01:12:51Z JGEET:ART

A Comparison of Geologic Structure Detection of Sumatera Island Using Goce Satellite Gravity Data and Sgg-Ugm-2 Data Al Shida Natul Leni Sophia Heliani GOCE SGG-UGM-2 Gravity Disturbance Complete Bouguer Anomaly Sumatran Fault Zone Geological Structure GOCE gravity satellite data can be used for regional fault detection because the observation area is wide and not limited by area. In this study, GOCE satellite data is used to detect geological structures on the island of Sumatra, the results of which are used as the basis for disaster mitigation. GOCE data and SGG-UGM-2 were processed using the GOCE User Toolbox (GUT) software to produce a gravity disturbance map and a complete bouguer anomaly map. The GOCE obtained results were validated using the SGG-UGM-2 high-resolution gravity model data. The calculation results obtained that the gravity disturbance value from the GOCE data was around -140 to 200 mGal, while the value of the gravity disturbance from the SGG-UGM-2 data was around -180-300 mGal. The GOCE gravity disturbance map and the SGG-UGM-2 can detect the Subduction Trench, Mentawai Fault, and West Andaman Fault on Sumatra Island with negative values, while the Sumatran Fault Zone (SFZ) along Sumatra Island with positive values ​​in line with the presence of mountain ranges. The results of the SGG-UGM-2 data processing for the gravity disturbance are more detailed than GOCE because the SGG-UGM-2 data degree is higher than that of GOCE. GOCE complete bouguer anomaly value is around 40-560 mGal, while the value of complete bouguer anomaly SGG-UGM-2 is around 60-560 mGal. The complete bouguer anomaly maps from GOCE and SGG-UGM-2 can detect patterns from the Subduction Trench, Mentawai Fault, and West Andaman Fault but cannot clearly detect SFZ. The complete bouguer anomaly can also detect differences between oceanic and continental crust. The GOCE and the SGG-UGM-2 complete bouguer anomaly map show almost similar patterns and the ability to detect geological structures for sub and regional Sumatra Island. In addition, GOCE data detect geological structures more clearly than GRACE data. UIR PRESS 2022-09-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8863 10.25299/jgeet.2022.7.3.8863 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 3 (2022): JGEET Vol 07 No 03 : September (2022); 95 -101 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8863/4596 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/8986 2022-10-10T01:13:44Z JGEET:ART

The Role of Inertinite Characteristics and Coal Porosity of Seam A-1 of Muara Enim Formation in West Merapi, Lahat, South Sumatera, Indonesia Rahmad, Basuki Prayitno, Budi S.S.R, Susilawati Sugeng Ediyanto inertinite porosity mineral matter permeability fluid flow vitrinite reflectance Coal contains a complex network of nano-, meso-, and a macro-pore can store fluids and allow fluids to flow through it. Nanoporosity in coal is primarily a result of molecules that have aromatic molecular structures and have been preserved in coal. Most adsorbate compounds, including gases, are stored here. The study area is located in South Sumatera, West Merapi Area, Lahat Regency. Geologically, the area in South Sumatra Basin belongs to the Middle-Late Miocene Muara Enim Formation. Using the ply-by-ply method, coal samples were taken directly from Seam-A in the coal mine walls outcrop, based on macroscopically determinable lithotype information. During laboratory analyses, coal is microscopically analyzed to determine the amount of porosity, permeability, and vitrinite reflectance. The purpose of this study is to investigate the change in composition and characteristics of inertinite macerals when the porosity value is varied.. Vitrinite content is between 91.00-92.80 %; liptinite 0.90-3.40%; inertinite 3.70-4.80%; mineral matter 0.7%-1.8%. Withh a vitrinite reflectance average of 0.34-0.36%, the variation in composition is an indication of changes in plant communities or coal facies. It is generally classified as sub-bituminous coal (ASTM). Porosity value of seam A upper  is 1.9% and seam A lower 1.51%, permeability value seam A upper is 70.1 mD and seam A lower 27.1%. Composition of mineral matter in seam A upper is 0.8%  and seam A lower 1.7%.  The increasing number of inertinite pore is followed by lower porosity value. The inertinite maceral is predominantly aromatic with a high level of cross-linking, and exhibits a high level of aromatization and condensation. They have the highest carbon and the lowest oxygen hydrogen content. A coal maceral's porosity is composed of void spaces, such as open cell lumens preserved in semifusinite and sclerotinite. The porosity of cleats is the percentage of volume in relation to volume of coal, and the porosity of permeability. In coal, semifusinite has extensive interconnected pores that can form significant conduits for fluid flow. UIR PRESS 2022-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/8986 10.25299/jgeet.2022.7.2.8986 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 2 (2022): JGEET Vol 07 No 02 : June (2022); 87 - 94 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/8986/4368 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/9161 2022-10-10T01:10:52Z JGEET:ART

The Effect of Weathered Layer Thickness and Slope on Potential Areas of Landslides in Gerbosari Village, Samigaluh District, Kulonprogo Regency, Indonesia Novia Nurul Khayati Sudarmaji Eddy Hartantyo landslides weathered layer thickness microzonation Gerbosari Village Gerbosari Village has a history of landslides with intensity and risk of 56 occurrences over 5 years. Gerbosari Village, Samigaluh District, Kulonprogo Regency is located at geographic coordinates 7◦ 38 '45.33 "- 7◦ 41' 35.24" LS and 100◦ 9 '20.80 "- 110◦ 11' 16.52" BT with topographic conditions at an altitude around 500 - 1000 mdpl. This study aims to determine the subsurface structure of landslide-prone areas in the form of weathered layer thickness and the effect of slope in landslide-prone areas so that it can be used in making micro zonation maps of landslide-prone areas. This study uses 43 microtremor data with a distance between points of 650 m. The microtremor signal was analysed using the horizontal to vertical spectrum ratio ( HVSR) method. From the measurement results, it is obtained that the value of the dominant frequency ranges from 1 - 22 Hz, the value of the amplification factor is obtained in the range of 1 - 10.5, the value of the peak ground acceleration ranges from 60 - 300 cm/s2, the thickness of the weathered layer is obtained in the range of 12 - 22 meters. Based on the results of the slope analysis, the study area is on a slope classified as a bit steep - very steep. UIR PRESS 2022-09-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/9161 10.25299/jgeet.2022.7.3.9161 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 3 (2022): JGEET Vol 07 No 03 : September (2022); 124 - 131 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/9161/4601 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/9164 2022-10-10T01:17:51Z JGEET:ART

Analysis of Grain Morphology, Mineral Composition, and Ore Grade on Gold Placer Deposits in Bantimurung, Pangkep Regency, South Sulawesi, Indonesia Irfan, Ulva Ria Husain, Angga Alamin Nur, Irzal Grain Morphology Placer Deposits Stream Sediment Baturappe-Cindako Volcanic Bantimurung Earth Science The information through social media shows that there is quite an intense placer mining activity by local residents in the Bantimurung area, Tondong Tallasa District, Pangkep Regency. This study as a preliminary research aims to determine the grain morphology characteristics of mineral composition and metal grade in gold placer deposits in the study area. The data collected were eight samples. The collected samples were prepared into thin section, polished and observed using a microscope to identify the mineral composition and grain morphology. The grades of Au metal and its associated metals consisting of Ag, Zn, Pb, and Cu in the placer samples were analyzed by the AAS method. Petrography shows abundant of quartz, plagioclase, biotite and pyroxene minerals it might be indication of mineralization of epithermal. Ore petrography shows pyrite present along the river, silver is also found quite a lot along the river. Meanwhile, covellite, magnetite, sphalerite, and garnet were found only slightly at the sampling station this mineral composition indicates that the source of the placer deposits was epithermal. The grain morphology of the thin-section observation shows that quartz dominant has a high sphericity with character of roundness tends to be very angular to sub-rounded from upstream to downstream of the river. Plagioclase tends to have sub rounded roundness and high sphericity. Biotite tends to have a high sphericity with roundness from upstream to downstream is very angular, then angular, then sub-rounded. Pyroxenes tend to have high sphericity with very angular and angular roundness. Au content is directly proportional to Cu and inversely proportional to Zn, Pb, and Ag. Statistically Au affects the content of Cu by 50.97%. It can be concluded that Au is genetically associated with Cu, however Au grains that were still attached to the mineral and had not been separated from other minerals so that it could not be seen visually. This can also indicate that the source of this placer deposit is not far from the study site. Au grade corelated with stream sediment types it is 97,86 ppm for channel bar and 94,16 ppm for point bar, based on this we conclude the downstream has higher grade of Au compare to the upstream. UIR PRESS 2022-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Text application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/9164 10.25299/jgeet.2022.7.2.9164 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 2 (2022): JGEET Vol 07 No 02 : June (2022); 39 - 48 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/9164/4352 Economic Geology Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/9215 2022-03-30T02:40:23Z JGEET:BC

Back matter JGEET Vol 07 No 01 2022 (J. Geoscience Eng. Environ. Technol.), JGEET               UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/9215 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/9215/4063 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/9216 2022-03-30T02:40:23Z JGEET:CVR

Front Matter JGEET Vol. 07 No. 01 2022 (J. Geoscience Eng. Environ. Technol.), JGEET              UIR PRESS 2022-03-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/9216 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022) 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/9216/4064 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology

oai:journal.uir.ac.id:article/9235 2022-10-10T01:14:14Z JGEET:ART

Morphotectonic Control of Land Movements at Wundulako Region, Kolaka Regency, Southeast Sulawesi Province, Indonesia Martono Hasria Asfar, Suryawan Azzaman, Muhammad Arba Ngkoimani, La Ode Okto, Ali Hamimu, La Irawati Sawaludin Iradat Salihin, La Ode Muhammad Wahab Morphotectonic land movement tectonic classes This research is located at Wundulako District, Kolaka Regency, Southeast Sulawesi Province. The purpose of this study are to determine the level of tectonic activity and the effect of tectonic activity on the land movement of the study area. Based on the DEM (Digital Elevation Model) analysis, geomorphology of the study area is dominated by mountains unit that indicate the influence of tectonic activity. Geomorphological aspects were analyzed to determine the tectonic classes in the study area such as watershed and non-watershed analysis. The results showed that, tectonic class of the study area is classified as very high and moderate tectonic class. The effect of tectonic class level on land movement in the study area shows a least correlation. This interprets that the cause of land movement at study area is not only influenced by tectonic factors but is also influenced by other factors such as rainfall, lithological conditions, geomorphology, earthquakes, and human activities. This shows that morphotectonic control has little effect on the land movements at Wundulako District, Kolaka Regency, Southeast Sulawesi Province, but is also influenced by other factors such as rainfall, lithological conditions, geomorphology, earthquakes, and human activities. UIR PRESS 2022-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://journal.uir.ac.id/index.php/JGEET/article/view/9235 10.25299/jgeet.2022.7.2.9235 Journal of Geoscience, Engineering, Environment, and Technology; Vol. 7 No. 2 (2022): JGEET Vol 07 No 02 : June (2022); 80 - 86 2541-5794 2503-216X eng https://journal.uir.ac.id/index.php/JGEET/article/view/9235/4366 Copyright (c) 2022 Journal of Geoscience, Engineering, Environment, and Technology b1763d41a3509eea390d3c629c30ba4d