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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Fisika
Andre Rahmat Al Ansory
Unknown Affiliation
Earth & Planetary Sciences Engineering Environmental Science Physics

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Morphometric Analysis and Stress Orientation of Kaba, Daun, and HulupalikVolcanoes, Bengkulu Province, Indonesia Abimayu, Dadin Mars Abimayu; Hadi, Arif Ismul Hadi; Refrizon; Nanang Sugianto; Sapari Dwiyono; Andre Rahmat Al Ansory; Raihana, Hana Raihana; Hakim, Arieffin Yusuf Hakim; Asy Syifa Auliya Putri Ramadhani
Jurnal Fisika Vol. 14 No. 2 (2024): Jurnal Fisika 14 (2) 2024
Publisher : Universitas Negeri Semarang

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Abstract

Bengkulu Province is an area in Sumatra that is surrounded by Bukit Barisan. This research aims to provide information about the horizontal stress orientation data σHmaxs on the volcanoes of Kaba, Bukit Daun, and Hulupalik, as well as added information about the slope data in the research location that underlies the volcanic arc on the Sumatra Fault. We conducted this research by mapping the morphology of the mountain and determining the straight line of stress orientation, this research uses DEMNAS data of Geospatial Information Agency (BIG). At Kaba Mountain, the maximum stress azimuth angle (σHmaxs) is orientated towards 62° to the East-Northeast/ENE. The direction of plate movement that gives horizontal stress on Kaba volcano is from the east-northeast / ENE and west-southwest / WSW. On Mount Hulupalik determining the azimuth angle of the orientation of the Horizontal stress σHmaxs, the azimuth is towards NNE29°. On Mount Daun where the azimuth angle itself is NNE26°. From the azimuth direction of the horizontal stress (σHmaxs) of Mount Daun and Hulupalik, the plate stress moves from South Southwest/SSW and North Northeast/NNE. Regardless of the direction of horizontal stress/σHmaxs of each mountain, it is influenced by several factors that can cause different stress directions.
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 Abimayu, Dadin Mars Abimayu Arif Ismul Hadi Asy Syifa Auliya Putri Ramadhani Hadi, Arif Ismul Hadi Hakim, Arieffin Yusuf Hakim Hana Raihana Muammar, Zaky Muchammad Farid Nanang Sugianto Raihana, Hana Raihana Refrizon Sapari Dwiyono Tedy Algozali