LOCAL SEISMIC RESPONSE AND EARTHQUAKE VULNERABILITY ZONING AROUND THE BOGOR FAULT, KEPAHIANG REGENCY, BENGKULU
DOI:
10.29303/ipr.v9i3.661Downloads
Abstract
Kepahiang Regency, Bengkulu Province, is located in the active tectonic zone of the Sumatran Fault System (Musi Segment), with the Bogor Fault running near residential areas, potentially increasing the risk of local earthquakes. This study aims to analyze local seismic response and map earthquake-vulnerability zones along the Bogor Fault using microseismic measurements from 40 observation points. This analysis integrates the parameters f0, A0, SVI, PGA, GSS, and Vs to evaluate the structural influence of the Bogor Fault on seismic response and earthquake vulnerability. The results show a range of values for f₀ of 1.64–17.97 Hz, A₀ of 2.15–9.15, SVI of 0.91–35.52, PGA 0.12–0.41 g, GSS 1.01 × 10⁻⁵–1.97 × 10⁻⁴, and Vs 183–2700 m/s, with location classes ranging from SA to SE according to SNI 1726:2019. Areas with low Vs values exhibit higher SVI, PGA, and GSS values, indicating stronger seismic amplification and greater potential for deformation. The distribution of these parameters aligns with the orientation of the Bogor Fault, suggesting a structural influence on the local seismic response. A comprehensive analysis of f0, A0, SVI, PGA, GSS, and Vs identified three vulnerability zones: high vulnerability along the central-to-northeastern corridor of the Bogor Fault and low vulnerability in the western and southwestern sectors. Microzonation mapping resulted in categorizing the study area into low-, moderate-, and high-vulnerability zones. This study revealed that the level of earthquake vulnerability in Kepahiang is largely determined by geological conditions, including the presence of faults, which can guide earthquake hazard mitigation efforts and the development of risk-based spatial planning.
Keywords:
Fault-based microzonation HVSR Seismic Vulnerability Index Peak Ground Acceleration Bogor FaultReferences
[1] S. Widiyantoro, P. Supendi, N. Rawlinson, M. R. Daryono, and S. Rosalia, “A note on the seismicity of Sumatra, western Sunda Arc, Indonesia, in relation to the potential for back-arc thrusting,” Sci. Rep., pp. 1–10, 2024.
[2] S. Ardiansyah, “Analisis Gempa Bumi Signifikan Segmen Musi, Kepahiang-Bengkulu,” vol. 4, no. 156, 2017. Book.
[3] A. I. Hadi et al., “Seismic microzonation of Kepahiang regency, Indonesia using the HVSR method : enhancing Urban resilience to mitigate earthquake vulnerability,” Indian Geotech. J., no. 1, 2025.
[4] M. R. Rabbani, A. I. Hadi, B. Harlianto, M. Farid, H. Raihana, and A. P. Anggi, “HVSR Microtremor Analysis to Assess Subsurface Fault Characteristics and Geothermal Potential in Kepahiang,” J. Geocelebes, vol. 9, no. 2, pp. 157–170, 2025.
[5] E. F. Widyantari, M. A. Adhi, N. B. Wibowo, I. Rahma, B. E. Farsiyyi, and R. S. Ulya, “Evaluation of Seismic Vulnerability Index and Soil Analysis and the HVSR Method,” REKAYASA J. Penerapan Teknol. dan Pembelajaran, vol. 21, no. 1, pp. 45–52, 2023, doi: http://journal.unnes.ac.id/journals/rekayasa.
[6] Z. Muammar, M. Farid, A. I. Hadi, T. Alghozali, A. R. A. Ansory, and H. Raihana, “Estimation Top and Bottom of Bogor Fault, Kepahiang Regency Based on 2D Magnetotelluric Data Analysis,” J. Geosci. Eng. Environment, Technol., vol. 10, no. 3, 2025.
[7] B. I. Siburian, M. Marzuki, and A. M. Lubis, “Local site effects and seismic microzonation around Suban Area, Curup Rejang Lebong, Bengkulu deduced by ambient noise measurements,” Geoenvironmental Disasters, 2024, doi: 10.1186/s40677-024-00268-7.
[8] A. Ardiansyah, M. A. Adhi, Sarwi, B. Astuti, Cindiwati, and N. B. W, “Seismic Vulnerability Microzonation Using HVSR Method in Kalisalak Hamlet, Garunglor Village, Sukoharjo Sub-District, Wonosobo District,” J. Fis. UNNES, vol. 14, no. 2, pp. 14–23, 2024.
[9] C. Damayanti, “Analysis Of Microtremor Data For Identification Of Sediment Layer Thickness Based On Ground Profile vs. in Solok City, West Sumatra, Indonesia. J. Appl. Phys., vol. 13, no. 2, pp. 158–170, 2023.
[10] M. F. Falah, M. M. Mukti, Ismawan, and F. Helmi, “Fault Segmentation Of Southern Sumatra ( Sianok Segment-Semangko Segment ) Based On Active Fault Mapping Through Digital Elevation Model ( DEM ) and,” J. Geol. Sci. Appl. Geol., vol. 7, no. 2, pp. 38–51, 2023.
[11] P. R. Gafoer S, Amin TC, Peta geologi kuadran Bengkulu, Sumatra (dalam bahasa Indonesia) Peta geologi kuadran Bengkulu, Sumatra (dalam bahasa Indonesia). Pusat Survei Geologi, Badan Geologi, Kementerian Energi dan Sumber Daya Mineral. 2007. [Online]. Available: https://geologi.esdma.go.id/geomap/pages/preview/peta-geologi-lembar- bengkulu-sumatera
[12] I. H, Laporan Akhir Inventarisasi Mineral dan Batu untuk Tahun Anggaran 2013 (dalam bahasa Indonesia). Kepahiang, Bengkulu, Indonesia. 2013. Book.
[13] A. I. Hadi, K. S. Brotopuspito, S. Pramumijoyo, and H. C. Hardiyatmo, “Regional Landslide Potential Mapping in Earthquake-Prone Areas of Kepahiang Regency, Bengkulu Province, Indonesia,” Geosciences, 2018.
[14] B. Sunardi, Sismanto, E. Hartantyo, and M. Nukman, “Seismic Vulnerability in Yogyakarta Basin Based on HVSR Frequency Domain Window Rejection Algorithm,” Int. J. Des. Nat. Ecodynamics, vol. 20, no. 4, pp. 813–823, 2025.
[15] I. S. Siregar and Madlazim, “Analisis mikrotremor dengan metode hvsr untuk mengetahui zona penguatan gempa bumi di wilayah stasiun seismik Jawa Timur,” J. Inov. Fis. Indones., vol. 06, pp. 33–38, 2017.
[16] Z. Ba, Q. Sang, J. Liang, and M. Wu, “HVSR analysis of a layered saturated half-space using diffuse-field theory,” Geophys. J. Int., pp. 270–286, 2021.
[17] Arizona, S. L. Manginsih, N. K. Praja, Hasria, and Azhar, “Soil Layer Mapping Using HVSR Microtremor Data and Its Impact on the Carrying Capacity of Soil in the Kendari City Area,” J. Geol. dan Sumberd. Miner, vol. 24, no. 1, pp. 51–58, 2024.
[18] Y. T. Wahyuni, D. Mardiatno, and G. Samodra, “Analisis kerentanan seismik dan klasifikasi tanah di wilayah sekitar Sesar Opak menggunakan data mikrotremor,” JoP, vol. 10, no. 2, pp. 54–65, 2025.
[19] K. Dialosa, Rustadi;, B. S. Mulyatno, and C. Sulaeman, “Analisis Tingkat Risiko Dampak Gempa Bumi di Kabupaten Cilacap Menggunakan Metode DSHA dan Data Mikrotremor,” J. Geofis. Eksplor., no. 3, 2012.
[20] Y. Nakamura, “On The H / V Spectrum,” in 14th World Conference on Earthquake Engineering, Beijing, 2008. Book.
[21] L. Kainde, C. Poluakan, A. Rampengan, and M. Zulkifli, “Pemodelan Percepatan Tanah sebagai Parameter Hazard Gempabumi menggunakan Metode Deterministic Seismic Hazard Analysis di Kota Manado,” J. FisTa Fis. Dan Ter, vol. 4, no. 2, pp. 83–93, 2023.
[22] K. Kanai, “On the predominating period of earthquake motions,” Bulletin Earthq. Res. Institute, Univ. Tokyo, vol. 35, pp. 99–106, 1957.
[23] K. Kanai and T. Tanaka, “On microtremors VIII,” Bull. Earthq. Res. Institute, Univ. Tokyo, vol. 39, pp. 97–114, 1961.
[24] Supriyadi, Khumaedi, Sugiyanto, A. R. Fadilah, and W. H. Muttaqin, “Study Of The Subsurface Structure Based On Microseismic Data In The Heritage Area Of Kota Lama Semarang, Indonesia,” Int. J. GEOMATE, vol. 23, no. 97, pp. 211–219, 2022.
[25] M. Farid and L. Z. Mase, “Implementation Of Seismic Hazard Mitigation On The Basis Of Ground Shear Strain Indicator For Spatial Plan Of Bengkulu City, Indonesia,” Int. J. GEOMATE, vol. 18, no. 69, pp. 199–207, 2020.
[26] S. L. Kramer, Geotechnical Earthquake Engineering, 1st ed. Upper Saddle River, New Jersey: Prentice Hall, 1996.
[27] A. D. Situmeang et al., “HVSR-Based Microzonation of Natural Frequency, Amplification, Vulnerability Index, and Ground Shear-Strain in Malang City, East Java,” Prism. Sains J. Pengkaj. Ilmu dan Pembelajaran Mat. Dan IPA IKIP Mataram, vol. 14, no. 1, pp. 258–275, 2026.
[28] M. Mucciarelli and M. R. Gallipoli, “A critical review of 10 years of microtremor HVSR technique,” Boll. Di Geofis. Teor. Ed Appl., vol. 42, no. 1, pp. 255–266, 2001.
[29] J. Xia, R. D. Miller, and C. B. Park, “Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves,” Geophysics, vol. 64, no. 3, pp. 691–700, 1999.
[30] C. Finger, S. Keil, A. Gotowik, A. Jüstel, and A. Brotzer, “Mapping sediment depths using seismic arrays, rotational measurements, and spectral ratios,” Acta Geophys., vol. 73, no. 3, pp. 2657–2667, 2025.
[31] Y. Yang, L. Shi, and J. Huang, “Regional mapping of sediment thickness using microtremor HVSR spatial variability,” Discov. Geosci., pp. 2–18, 2025.
[32] C. J. Araque-Perez, “Reevaluating soil amplification using multi-spectral HVSR technique in La Chana Neighborhood, Granada, Spain,” J. Seismol., vol. 28, no. 4, pp. 921–949, 2024.
[33] R. Paulik, E. Lane, S. Williams, and W. Power, “Changes in Tsunami Risk to Residential Buildings at Omaha Beach, New Zealand,” Geosciences, pp. 1–17, 2019.
[34] Supriyadi, W. H. Muttaqin, Khumaedi, and Sugiyanto, “Soil Vulnerability Levels based on Microtremor Data using the HVSR method in the Old City Area of Semarang,” J. Phys. Theor. Appl., vol. 6, no. 1, pp. 34–42, 2022.
[35] G. Kencoro, M. Farid, A. I. Hadi, D. I. Fadli, and A. Sedayu, “Analisis zona rawan gempa bumi di Kabupaten Bengkulu Selatan berdasarkan percepatan tanah puncak menggunakan formula Kanai,” J. Kumparan Fis., vol. 6, no. 2, pp. 75–82, 2023.
[36] Amirudin, I. Madrinovella, and Sofian, “Seismic Vulnerability Analysis Using the Horizontal to Vertical Spectral Ratio ( HVSR ) Method on the West Palu Bay Coastline,” J. Geosci. Eng. Environ. Technol., vol. 08, no. 02, pp. 23–34, 2023.
[37] E. F. Anggraeni and J. Arif, “Analisis Dinamika Tanah Kotaagung Menggunakan HVSR untuk Estimasi Peak Ground Acceleration,” J. Media Inform., vol. 6, no. 6, pp. 3092–3100, 2025.
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