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All Journal Journal of Geoscience, Engineering, Environment, and Technology Buletin Sumber Daya Geologi
Hana Raihana
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Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics

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DELINEASI NILAI RESISTIVITAS DI LAPANGAN PANAS BUMI TAMBANG SAWAH MENGGUNAKAN METODE MAGNETOTELLURIK Al Ansory, Andre Rahmat; Hana Raihana; Pritama, Vinki Loverly; Saputri, Welly; Maghribi, Faritz Bagda; Muchammad Farid; Arif Ismul Hadi; Halauddin; Harlianto, Budi; Sugianto, Nanang
Buletin Sumber Daya Geologi Vol 18 No 3 (2023): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v18i3.386

Abstract

The subsurface structure of the geothermal field in Desa Tambang Sawah has been mapped. This research aims to delineate the resistivity values in the area of Tambang Sawah Village, Lebong Regency, Bengkulu Province based on magnetotelluric measurements which can later identify low, medium, and high resistivity values to interpret geothermal in the research area. The magnetotelluric (MT) method with electrical and magnetic sensors is used to collect data in the field. There are two electrical sensors in horizontal direction (Ex, Ey) and three magnetic sensors in horizontal direction. (Hx, Hy) and vertical (Hz). The results obtained from this study are that resistivity values of 20-50 ohm.m are considered as reservoirs, while resistivity of 0.26-0.8 ohm.m is considered as caprock, and resistivity greater than 300 ohm.m is considered as hot rock.
Estimation Top and Bottom of Bogor Fault, Kepahiang Regency Based on 2D Magnetotelluric Data Analysis Muammar, Zaky; Muchammad Farid; Arif Ismul Hadi; Tedy Algozali; Andre Rahmat Al Ansory; Hana Raihana
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.21168

Abstract

Kepahiang Regency, Bengkulu Province, is an area crossed by the Musi segment of the Sumatra Fault and a number of secondary faults, including the Bogor Fault, which contribute to the high level of seismic activity in the region. The presence of these active faults, combined with a relatively high population density, poses a potential threat to infrastructure and public safety. This study aims to identify the subsurface geometric characteristics of the Bogor Fault, particularly its upper and lower depths, as part of earthquake disaster mitigation efforts. The Magnetotelluric (MT) method was used in this survey with the ADU-07e system, which utilizes natural electromagnetic fields, with two horizontal electrical sensors (Ex, Ey) and three horizontal sensors (Hx, Hy), as well as a vertical magnetic sensor (Hz). Data collection was conducted at six measurement points with a 1 km interval along the Northeast–Southwest transect that crosses the Musi Fault and the Bogor Fault. Data processing was performed using MAPROS software for time-domain to frequency-domain conversion, and ZONDMT2D for subsurface modeling. The modeling results showed a low resistivity zone at point T6, with values between 0.21–1.6 Ωm, which was interpreted as the presence of the Bogor Fault. This zone was identified at a depth of approximately 2 km and was estimated to extend more than 8 km in the north–south direction. This finding provides important indications of the presence of an active fault in the area and can serve as a basis for earthquake risk mitigation efforts in Kepahiang.
Co-Authors Al Ansory, Andre Rahmat Andre Rahmat Al Ansory Arif Ismul Hadi Halauddin Harlianto, Budi Maghribi, Faritz Bagda Muammar, Zaky Muchammad Farid Nanang Sugianto Pritama, Vinki Loverly Saputri, Welly Tedy Algozali