The Soft Layer Thickness Estimation using Microtremor Measurement to Identify Landside Potential in Watukumpul, Central Java, Indonesia.

  • Urip Nurwijayanto Prabowo Physics Department, Faculty of Matehemathics and Natural Science, Universitas Jenderal Soedirman, Purwokerto, Indonesia.
  • Akmal Ferdiyan Physics Department, Faculty of Matehemathics and Natural Science, Universitas Jenderal Soedirman, Jl. Dr. Soeparno No. 61, Purwokerto, Central Java, Indonesia.
  • Ayu Fitri Amalia Physics Education Department, Faculty of Teacher Training and Education, Universitas Sarjanawiyata Tamansiswa, Yogyakarta, Indonesia.
Keywords: 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.


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