Journal of Geoscience, Engineering, Environment, and Technology <p style="text-align: justify;"><strong>JGEET (Journal of Geoscience, Engineering, Environment, and Technology) </strong>&nbsp;<strong>(E-ISSN&nbsp;: 2541-5794, P-ISSN&nbsp;: 2503-216X )</strong> is a peer-reviewed and open access journal that publishes significant and important research from area of geological science, related with engineering, environment, and technology. We accept submission from all over the world on English language. Editorial Board members are prominent and active researchers in geological sciences and engineering fields who ensure efficient, fair, and constructive peer-review process. All accepted articles will be published and available to all readers with worldwide visibility and coverage. Our Journal already <a href="">indexed </a>in DOAJ, EBSCO, SINTA, GARUDA, Indonesia One Search, Crossref, Index Copernicus, OCLC, BASE, and University Libraries around the world.&nbsp;&nbsp;</p> <p style="text-align: justify;"><strong>ACCREDITED by Ministry of Research, Technology, and Higher Education of the Republic of Indonesia, <a title="Accreditation Certificate" href="" target="_blank" rel="noopener">No.30/E/KPT/2018</a>,&nbsp;October 24, 2018</strong></p> UIR PRESS en-US Journal of Geoscience, Engineering, Environment, and Technology 2503-216X <p>Copyright @2019. This is an open-access article distributed under the terms of the Creative Commons&nbsp;Attribution-ShareAlike 4.0 International License which permits unrestricted use, distribution, and reproduction in any medium.&nbsp;Copyrights of all materials published in JGEET are freely available without charge to users or / institution. Users are allowed to read, download, copy, distribute, search, or link to&nbsp;full-text&nbsp;articles in this journal without asking&nbsp;by giving&nbsp;appropriate credit, provide a link to the license, and&nbsp;indicate if changes were made. All of the&nbsp;remix, transform, or build upon the material must distribute the contributions under the&nbsp;same license&nbsp;as the original.&nbsp;</p> Front matter JGEET Vol 08 No 04 2023 <p>&nbsp; &nbsp;&nbsp;</p> JGEET (J. Geoscience Eng. Environ. Technol.) Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 Back matter JGEET Vol 08 No 04 2023 <p>&nbsp;&nbsp;</p> JGEET (J. Geoscience Eng. Environ. Technol.) Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 Hydrogeochemistry and Isotope Characteristics of the Hot Springs in the Wapsalit Area, Buru Regency, Maluku Province, Indonesia <p>Wapsalit is one of the geothermal areas that is located in Buru Regency, Maluku Province. Wapsalit area has several geothermal manifestations like hot springs, altered rocks, silica sinter and many more. This research aims to determine the characteristics and origin of the fluid in the research area. This research takes 5 samples of hot springs named FATH-1, FATH-2, FATH-3, FATH-4 and FATH-5. Based on the results of chemical analysis, it shows that the 5 samples belong to the bicarbonate fluid type. FATH-1, FATH-3 and FATH-5 belong to the partial equilibrium zone, FATH-2 and FATH-4 belong to the immature water zone.&nbsp; Based on isotope <sup>18</sup>O and D analysis, the 5 hot spring samples originated from meteoric water and the fluids interacting with the rocks before heading to the surface.</p> Fathira Pinning Agus Didit Haryanto Johanes Hutabarat Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-11-01 2023-11-01 8 4 269 274 10.25299/jgeet.2023.8.4.13788 Identification Of Shear Strain On The Surface Ground Of Wangi-Wangi Island, Southeast Sulawesi, Indonesia, Using Nakamura’s Technique and The Possibility Of Its Impacts <p>This research was conducted to determine the possible impact of an earthquake on the mainland of Wangi-Wangi Island based on the presence of shear strain on the surface ground (<em>γ</em>). The size of <em>γ</em> is obtained by multiplying the ground susceptibility index and the acceleration of basement ground or PGA using Nakamura’s technique. The data used are microtremor data and earthquake data from 1920 to 2020 sourced from the USGS. Microtremor data are obtained from the results of filtering ground vibration signals using a Band Pass Filter in the frequency range between 0.5 to 25 Hz. Ground vibration signals were recorded at 47 measurement points spread over the surface of Wangi-Wangi Island within 29.25 to 48.16 minutes. Furthermore, the microtremor data were processed using the HVSR (Horizontal to Vertical Spectral Ratio) method. The use of earthquake data must meet the requirements for a surface magnitude (<em>M</em><sub>S</sub>) ≥ 5.0 SR and an earthquake epicenter depth (<em>h</em>) ≤ 45 km. The results obtained are the <em>γ</em> sizes of Wangi-Wangi Island in the order of 10<sup>-06</sup> to 10<sup>-03</sup>. Based on the size distribution, it is known that the majority of the Wangi-Wangi Island area has the potential to experience cracks and land subsidence due to settlements if an earthquake occurs, and only a portion of the area is vibrating. In addition, it is also known that the mainland of Wangi-Wangi Island is not prone to landslides and liquefaction because <em>γ</em>&lt;10<sup>-2</sup>.</p> Abdul Manan Cindy Puspitafuri Rani Chahyani Irawati Imanuela Indah Pertiwi Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 275 280 10.25299/jgeet.2023.8.4.11780 Identification of Saltwater Intrusion Distribution in North Padang Cermin Area, Lampung, Indonesia <p>The residential areas of North Padang Cermin are mainly located near the coastal area with a high level of groundwater use. Continuous groundwater use could potentially raise saltwater intrusion and lead to a decrease in groundwater quality. The research is conducted to identify the saltwater intrusion spread based on groundwater quality data. Geological observations were carried out to determine the geological conditions of the research area, followed by qualitative and quantitative hydrogeological observations by measuring TDS (Total Dissolved Solid), EC (Electrical Conductivity), pH, temperature, color, and taste. The Herzberg method was used to identify freshwater thickness against seawater intrusion.</p> <p>Hydrogeologically, the research area has four aquifer systems: aquifers with fissure and intergranular flow, aquifers with intergranular flow and wide-distribution productivity, aquifers with fissure and intergranular flow and local distribution, and aquifers with rare groundwater. Groundwater flow has a radial pattern with the most extensive hydraulic gradient with a value of 0.16 m towards the eastern part of the research area.</p> <p>The indications of seawater intrusion were found in the water samples measurement located on the east of the research area with water type of brackish–salty with a TDS value of 1,443 – 3,790 ppm and an EC of 3,000 – 7,580 (μS). Based on the Herzberg method, the distribution of seawater intrusion is estimated to occur at a depth of 36.8 m.</p> Alviyanda Anjar Dwi Asterina Redhatul Irma Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 281 287 10.25299/jgeet.2023.8.4.12236 An Application of HVSR Method on Microtremor Data for Analysis of Earthquake Potential in Candipuro District, Lumajang, Indonesia <p>The Earthquake of 6.1 magnitude occurred on April 10, 2021, in Lumajang district. One affected area suffered building losses, road damage, and casualties in Candipuro District, Lumajang Regency, East Java. Then the research was conducted to determine the strength of the soil against the potential earthquake by micro zoning the area in Candipuro District. This research uses the microtremor method with HVSR (Horizontal to Vertical Spectral Ratio) analysis. Analysis of earthquake potential includes parameters of Ground Amplification (A<sub>0</sub>), Dominant Frequency (f<sub>0</sub>), Ground Vulnerability Index (Kg), and Ground Shear Strain (GSS).</p> <p>The acquisition was completed with 16 measurement points in Supiturang Village with 500 meters between points using the Portable Seismograph TDS - 303. The results obtained in Supiturang Village have the results of the amplification value factor which is classified as medium-high (2.7 - 8.7), low dominant frequency value (0.5 - 1.4 Hz), medium-high soil susceptibility index (10 - 90), V<sub>S30</sub> value which includes medium - hard soil (187.81 - 548.38) m/s, and GSS value which shows the response of cracks and soil subsidence to shaking (2 x 10<sup>-5</sup> - 2 x 10<sup>-4</sup>).</p> Y. Yatini Abdurrohim Kustanto Putra Eko Teguh Paripurno Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 288 294 10.25299/jgeet.2023.8.4.13460 Study of Coastal Morphological Changes by Tsunamis in Aceh (Indonesia) Using Satellite Images <p>This study identified the coastal morphological changes caused by tsunamis that occurred in Banda Aceh, Lampuuk-Lhoknga, and Meulaboh. The morphology of study areas was drastic changes during the 2004 tsunami and followed by the 2005, 2010, and 2012 tsunamis. Time series of Landsat satellite images and tidal data were collected during the period 1988-2020 and analyzed using DSAS (Digital Shoreline Analysis System) analysis method. The main aim of this study is to monitor recovery, trend development, and controlling factors of the coastal morphology before and after fifteen years of the 2004 tsunami. </p> <p>In Banda Aceh, the shoreline shift in the 2004-2005 period shows an inland retreat trend, with an average NSM (net shoreline movement) value of -644.69 m. The EPR (end point rate) value for the 2005-2020 period reached 21.31 m/year, but the recovery of the 2020 shoreline position has not returned to the original position before the 2004 tsunami. The significant shoreline retreat and land loss with an average NSM value of -40.59 m in the period 2004-2005 occurred on the Lampuuk and Lhoknga beaches. The 2020 shoreline of Lampuuk beach underwent a recovery with accretion. Nevertheless, Lhoknga beach is still experiencing apparent erosion. The recovery of the Meulaboh east coast was fast as evidenced by the development of the annual growth of spit features. The coastal morphological changes are influenced by complex interactions between natural and anthropogenic processes. The 2004 tsunami was the major factor to change the coastal morphology in the study areas. </p> Ziadul Faiez Daidu Fan Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 295 304 10.25299/jgeet.2023.8.4.12757 Analysis of Disaster Vulnerability Areas in West Bandung Regency, West Java, Indonesia <p>Mineral resources, coal, and rock are one of the potentials possessed by Indonesia to be able to earn income from the mining sector. West Bandung Regency is one of the areas that have quite a lot of potential rock and mineral resources. The potential of this area is quite large, namely andesite rock, sand, limestone, and sandstone. Zeolite and others. On the other hand, the West Bandung area has a high potential and threat of being a disaster-prone. West Bandung Regency has the highest number of natural disasters occurring in the type of landslide disaster, which occurred 52 times in the period 2008-2016, or 68% of all disasters. Loss of economic value also occurs for mining material resources which are limited by the existence of a disaster zone. So it is necessary to carry out mitigation from the start to map disaster areas that have an impact on the distribution and existence of mining material resources. This study aims to identify and analyze the potential of rock resources in disaster-prone areas, so as to be able to prioritize conservation aspects for potential mining materials. The method used in this research is through literature study, mapping the potential of mining materials, mapping the potential of disaster-prone areas, processing of secondary data, and analysis using remote sensing. The results of this study are that the rocks in the West Bandung area are divided into groups of volcanic rocks, sedimentary rocks, and alluvial deposits. The volcanic rock group got a score of 3 because it was considered more prone to erosions than the sedimentary and alluvial rock groups which were scored 2 and 1. with a weighted level of disaster vulnerability. The zone of high disaster susceptibility is considered to have the highest probability of a disaster occurring. Therefore, in the final result, the overlap between the distribution of the potential for minerals and the zone of high disaster susceptibility results in a potential area for minerals that are relatively safe from disasters, both soil movement, and flooding. Potential mining resources in West Bandung Regency are Andesite basalt 1,860,412 ha (1.43%), Limestone 667.05 ha (0.50%), Sirtu 40,949.76 ha (31.35%%).</p> Dudi Nasrudin Usman Icih Sukarsih Yurika Permanasari Deni Mildani Sri Widayati Himawan Nuryahya Linda Pulungan Rully Nurhasan Ramadhani Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 305 311 10.25299/jgeet.2023.8.4.10065 Petrogenetic of Igneous Complex of Ilota Nanasi Gold Deposit, Gunung Pani, Gorontalo, Indonesia <p>Ilota Nanasi Au-Ag deposit located in the western flank of the Gn. Baganite, a part rhyodacite dome in Gn. Pani district, Gorontalo Province, where the extensive exploration programs were carried out by PT Gorontalo Sejahtera Mining (a subsidiary of PT J Resources Nusantara) from 2012 – 2020. As the result, a total of 72.7 Mt @ 0.98 g/t Au and 0.85 g/t Ag (2.3 Moz Au and 2.6 Moz Ag) mineral resource was delineated in 2019. This paper mainly aimed to the petrogenesis association of granitoid basement and rhyodacite unit as the host rock in the Ilota Nanasi gold deposit.</p> <p>The geology of Ilota Nanasi is overlain by Late Miocene granodiorite, andesite and diorite basement, Pliocene volcanic complex predominantly dacite – rhyodacite, tuff, breccia, and quaternary deposit as alluvial and surface breccia. Hydrothermal alteration and gold – silver mineralization centered in the porphyritic rhyodacite host rocks where the intense silicification forming a zone around the hydrothermal crackle breccia unit and/or high-density quartz vein, veinlets and stockworks. Mineralization in Ilota Nanasi is interpreted as a low sulfidation epithermal system dominated by a large volume of hydrothermal crackle breccia, intense quartz veining, veinlets, and high-density fracturing.</p> <p>A combined analytical result of petrography and whole-rock geochemistry has been used to assess the petrogenetic association of the rhyodacite and granitoid basement in the Ilota Nanasi. The result of the AFM diagram plot shows sample trends in calc-alkaline magma field. In contrast, the SiO<sub>2</sub> – K<sub>2</sub>O plot distributed in two trends: the older unit was associated with high-K calc-alkaline and the shoshonite series for the younger unit. The changing of magma series is considered as product of crystallization differentiation of evolved parental magma or derived from the melting of mantle material after the mantle or lower crustal was metasomatized during a former episode of subduction.</p> Iryanto Rompo Fajar Ismail STJ Budi Santoso Mega Fatimah Rosana Euis Tintin Yuningsih Copyright (c) 2023 Journal of Geoscience, Engineering, Environment, and Technology 2023-12-19 2023-12-19 8 4 312 323 10.25299/jgeet.2023.8.4.14250