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All Journal Jurnal Geosaintek
Hana Raihana
Universitas Bengkulu
Earth & Planetary Sciences

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3D MODELING AND DERIVATIVE ANALYSIS OF THE KETAHUN SEGMENT BASED ON GGMPLUS AND SRTM2 DATA FOR DISASTER MITIGATION Clora Ulandari; Halauddin Halauddin; Refrizon Refrizon; Hilmi Zakariya; Suhendra Suhendra; Muchammad Farid; Alda Sulistiani; Hana Raihana; Nurul Apriyanti
Jurnal Geosaintek Vol. 12 No. 2 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i2.9106

Abstract

interaction between the Sumatra subduction zone and the Sumatra Fault, resulting in high seismic activity. One of the important segments with the potential to cause earthquakes is the Ketahun Segment in Lebong Regency, Bengkulu Province. This study aims to map the three-dimensional (3D) fault structure and identify lithological density contrasts to support disaster mitigation efforts. The methods used include processing GGMPlus and SRTM2gravity satellite gravity data, complete Bouguer correction, regional-residual anomaly separation, first horizontal derivative (FHD) and second vertical derivative (SVD) analysis, and 3D inversion modeling using Grav3D software. The CBA analysis results show anomaly values of –8 to 50 mGal with sharp gradations indicating the presence of major fault structures. SVD and FHD analyses show the dominance of dip-slip faults with significant density contrasts. The 3D inversion modeling shows a density range of 1.02–3.52 g/cm³ with an average value of 2.27 g/cm³, where the low-density zone is at a shallow depth (0–1500 m) and the high-density zone is at a depth of 500–2000 m. The sharp boundary between the two zones indicates an active fault plane at a depth of 1000–2500 m. These findings provide a more representative picture of the fault geometry and can be used as a basis for developing earthquake mitigation strategies and spatial planning based on actual geological conditions in the Bengkulu region.
DYNAMIC RESPONSE OF LOCAL SOIL USING MICROTREMOR ANALYSIS AFTER THE MAY 23, 2025 BENGKULU EARTHQUAKE Shyaira Marcelina; Muchammad Farid; Budi Harlianto; Bayu Saputra; Hana Raihana; Lita Putriani; Andre Rahmat Al Ansory
Jurnal Geosaintek Vol. 12 No. 3 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i3.9490

Abstract

The Mw 6.0 earthquake that occurred on May 23, 2025, caused significant damage to the Rafflesia Asri Housing Complex in Bengkulu City. This study aims to examine the dynamic response of the soil and the seismic vulnerability level of the area using the microtremor method and the Horizontal-to-Vertical Spectral Ratio (HVSR) approach. The parameters analyzed include soil dominant frequency (?0), amplification factor (?0), seismic vulnerability index (??), Peak Ground Acceleration (PGA) estimates, and shear wave velocity (??). Measurements were taken at 40 observation points. The analysis results show that ?0 values range from 1.56 to 6.73 Hz, ?0 ranges from 1.97 to 6.46, ?? ranges from 1.15 to 10.38, PGA ranges from 0.15 to 0.32 g, and ?? ranges from 143 to 400 m/s. Zones with low ?0, high ?0 and ??, and PGA followed by low ?? correlated with more significant building damage. These findings confirm that local soil dynamics play a dominant role in controlling seismic amplification and building damage patterns, underscoring the importance of microtremor-based seismic microzonation analysis for earthquake risk mitigation in Bengkulu City
Co-Authors Alda Sulistiani Andre Rahmat Al Ansory Bayu Saputra Clora Ulandari Farid, Muchammad Halauddin Halauddin Harlianto, Budi Hilmi Zakariya Lita Putriani Nurul Apriyanti Refrizon Refrizon Shyaira Marcelina Suhendra Suhendra