Jurnal Geosaintek
Vol. 12 No. 3 (2026)

DYNAMIC RESPONSE OF LOCAL SOIL USING MICROTREMOR ANALYSIS AFTER THE MAY 23, 2025 BENGKULU EARTHQUAKE

Shyaira Marcelina (Universitas Bengkulu)
Muchammad Farid (Universitas Bengkulu)
Budi Harlianto (Universitas Bengkulu)
Bayu Saputra (Universitas Bengkulu)
Hana Raihana (Universitas Bengkulu)
Lita Putriani (Universitas Bengkulu)
Andre Rahmat Al Ansory (Universitas Bengkulu)



Article Info

Publish Date
30 Aug 2026

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

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Journal Info

Abbrev

geosaintek

Publisher

Subject

Earth & Planetary Sciences

Description

Jurnal Geosaintek mempublikasikan dan menerbitkan hasil kajian, penelitian, penerapan ilmu pengetahuan serta teknologi di bidang ...