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All Journal Journal of Geoscience, Engineering, Environment, and Technology Buletin Sumber Daya Geologi Multidiciplinary Output Research for Actual and International Issue (Morfai Journal)
Arif Ismul Hadi
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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.
SEISMICITY ANALYSIS BASED ON THE INTEGRATION OF EARTHQUAKE VULNERABILITY INDEX (KG) THROUGH POLYGON DISTRIBUTION IN BENGKULU CITY AREA Shela Purba; Refrizon; Arif Ismul Hadi
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 3 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

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Abstract

Bengkulu Province is an area with a very high level of earthquake susceptibility, this is due to the confluence of large tectonic plates, covering Indo-Australia, Eurasia, and the Pacific. This is the fundamental reason for the need for micro-zoning mapping as a basis for spatial planning evaluation and sustainable development, especially in the city of Bengkulu which is the heart of the province where it is the center of regional social and economic activities. This concept is by applying the Horizontal to Vertical Spectral Ratio (HVSR) method and inversion of the microtremor curve as a result of obtaining shear wave velocity data at a depth of 30 meters as many as 30 measurement points covering the distributed Bengkulu City that forms polygons. The HVSR parameters reviewed include dominant frequency (f₀), amplification (A₀), and seismic vulnerability index ( Kg) show that Bengkulu City has very heterogeneous sediment characteristics from soft to hard where the value of the earthquake susceptibility index is in the range of 0.25-8 and the shear wave speed range at a depth of 30 meters, namely in the range of 240 m/s - 520 m/s. This study concludes that Bengkulu City has a very complex level of seismic vulnerability with specific conditions that divide the area into 3 large zones which include the risk zone, conditional zone, and safe zone. The division of the zone is an illustration of the response behavior to the area in Bengkulu City, both actions of managing the area wisely through improving the design of earthquake-resistant building structures so that the basis of regional planning recommendations for the direction of spatial planning in Bengkulu Province can minimize disaster risk. Keywords: HVSR, Microtremor, Vs30, Earthquake vulnerability index, Microzoning, spatial planning.
Co-Authors Al Ansory, Andre Rahmat Andre Rahmat Al Ansory Halauddin Hana Raihana Harlianto, Budi Maghribi, Faritz Bagda Muammar, Zaky Muchammad Farid Nanang Sugianto Pritama, Vinki Loverly Refrizon Saputri, Welly Shela Purba Tedy Algozali