Analysis of Earthquake Risk Estimation for Sustainable Development Using Microtremor Data Based on Vs30 Distribution: Comparative Study of DFA and Geopsy in Central Bengkulu, Indonesia

Authors

  • Arya Putra Anggi Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Refrizon Refrizon Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Budi Harlianto Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Nurul Apriyanti Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Winda Saputri Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Gian Ori Febriansyah Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Andre Rahmat Al-Ansory Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Hana Raihana Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Adrian Daniel Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia
  • Usman Gumanty Geophysics Study Program, University of Bengkulu, Bengkulu, 38225, Indonesia

DOI:

https://doi.org/10.25077/jif.17.2.214-228.2025

Keywords:

microtremor, HVSR, Seismic Vulnerability, Disaster Mitigation

Abstract

This research was conducted in Pondok Kelapa Subdistrict, Central Bengkulu Regency, to analyze subsurface characteristics using microtremor data and the Horizontal-to-Vertical Spectral Ratio (HVSR) method. The research compared DFA (Diffuse Field Assumption) and Geopsy approach. In this study, 40 points were measured with a distance between points ranging from 200 to 300 meters. The data were processed using Terraware-HV and Geopsy software with a Monte Carlo approach to model the 3D subsurface structure. Results show that the dominant frequencies range from 0.64 to 8.19 Hz, with high amplification zones between 1.92 and 7.72 concentrated in areas of loose soil, indicating their high seismic susceptibility. Vs30 values range from 55 to 465 m/s, reflecting the dominance of soft to medium materials, such as clay, gravel, sand, and soft rock at specific depths. 3D modeling revealed a heterogeneous distribution of subsurface materials, with high amplification zones requiring special mitigation. This study provides important insights for seismic risk zoning, disaster mitigation, and earthquake-resistant structure design, and supports sustainable development planning in earthquake-prone areas. The results are expected to serve as a reference in spatial management based on earthquake risk mitigation.

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Published

2025-09-05

How to Cite

Arya Putra Anggi, Refrizon, R., Harlianto, B., Apriyanti, N., Saputri, W., Febriansyah, G. O., … Gumanty, U. (2025). Analysis of Earthquake Risk Estimation for Sustainable Development Using Microtremor Data Based on Vs30 Distribution: Comparative Study of DFA and Geopsy in Central Bengkulu, Indonesia. JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS, 17(2), 214–228. https://doi.org/10.25077/jif.17.2.214-228.2025

Issue

Vol. 17 No. 2 (2025): September 2025

Section

Research Article

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Copyright (c) 2025 Arya Putra Anggi, Refrizon Refrizon, Budi Harlianto, Nurul Apriyanti, Winda Saputri, Gian Ori Febriansyah, Andre Rahmat Al-Ansory, Hana Raihana, Adrian Daniel, Usman Gumanty

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