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All Journal Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Jambura Geoscience Review
Hana Raihana
University of Bengkulu
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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Identification of Alteration Zones Based on Resistivity and Induced Polarization Geoelectric Survey Hana Raihana; Jesika Erni Elfrita Sinaga; Adinda Gusti Cahyani; Halauddin Halauddin; Suhendra Suhendra; Anggiat Hutauruk; Nanang Sugianto
Jambura Geoscience Review Vol 5, No 2 (2023): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jgeosrev.v5i2.17931

Abstract

Air Putih, Lebong Regency's geothermal field, is near gold mining. The relationship between the two can be illustrated in the type of rock alteration. The study aims to identify the rock alteration zone caused by the Air Putih, Lebong Regency geothermal system. It was described by the correlation of rocks' resistivity and chargebility values based on geoelectric measurement. Two tracks spread along the Air Putih tour, with a track length of 240 meters, were used to see variations in resistivity and chargeability values and the depth of geothermal potential due to deeper current penetration to determine the alteration zone in the study area. The results of field measurements are in the form of 2D models processed with Res2DinvX64 software. According to analysis, the subsurface rock lithology in the research area is relatively the same because the location of the two measurement lines is still close together; namely, there are wet valley rocks and alterated rock layers. Pores cause rock layers found in conductive areas in the rock filled with fluid or water at high temperatures. It is evidenced by the detection of manifestations on the surface in the form of warm soil, warm rocks, steamy soil, and small holes containing water grains. The higher the temperature and pressure, the lower the value of rock-specific resistance. At the Air Putih tourist area of Lebong Regency, it is found that it is a zone of prophylitic alteration containing several minerals of andesite lava, breccia, tuff, and soil.
Subsurface characterization using shear wave velocity (Vs30) for seismic site classification in Muara Bangkahulu District, Bengkulu City, Indonesia Clora Ulandari; Refrizon Refrizon; Halauddin Halauddin; Arif Ismul Hadi; Hana Raihana; Mesi Prasisilia; Nurul Apriyanti; Sefti Dewi Sari; Yola Dwi Rahmadhani
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 12, No 2 (2026)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/gravity.v12i2.38503

Abstract

Muara Bangkahulu District, Bengkulu City, is a coastal area located in an active seismic zone influenced by the Sumatra Subduction Zone and the Sumatra Fault. The geological conditions, dominated by alluvial sediments and swamp deposits, have the potential to amplify earthquake waves, requiring a study of subsurface characteristics as a basis for disaster mitigation. This study aims to identify variations in shear wave velocity (Vs30) and to determine soil site classification in accordance with SNI 1726:2019. The method used is Multichannel Analysis of Surface Waves (MASW), with ten measurement points and a track length of 50 m. The data were processed using Rayleigh-wave dispersion analysis and inversion to obtain a one-dimensional (1D) model, which was then integrated with two-dimensional (2D) modeling to describe lateral subsurface variations. The results show that the Vs30 value ranges from 137 to 450 m/s, with sites classified into SE, SD, and SC classes. The coastal area is dominated by soft-to-medium soils with high seismic amplification potential, while the central and eastern parts exhibit denser, more stable soil conditions. The integration of 1D and 2D models shows a heterogeneous subsurface structure both vertically and laterally. In conclusion, the MASW method is effective for technical considerations in seismic hazard assessment, for determining construction priorities, and for planning foundations better adapted to local soil conditions in the coastal area of Bengkulu City
Co-Authors Adinda Gusti Cahyani Anggiat Hutauruk Arif Ismul Hadi clora ulandari Halauddin Halauddin Halauddin Halauddin Jesika Erni Elfrita Sinaga Mesi Prasisilia Nanang Sugianto Nurul Apriyanti Refrizon Refrizon Sefti Dewi Sari Suhendra Suhendra Yola Dwi Rahmadhani