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All Journal Jurnal Geosaintek
Shyaira Marcelina
Universitas Bengkulu
Earth & Planetary Sciences

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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 Andre Rahmat Al Ansory Bayu Saputra Farid, Muchammad Hana Raihana Harlianto, Budi Lita Putriani