Seismic Vulnerability Analysis of Public Facility Buildings Using The Psha Approach For Detailed Spatial Planning (Case Study: Bawean Earthquake)
DOI:
https://doi.org/10.21111/ibmj.v8i2.15175Keywords:
PSHA, Seismic Vulnerability, Spatial PlanningAbstract
Indonesia, located along the Pacific Ring of Fire, faces high seismic risk that threatens infrastructure and public safety. This study analyzes the seismic vulnerability of public facility buildings using the Probabilistic Seismic Hazard Analysis (PSHA) approach to support risk-based detailed spatial planning in Bawean Island, East Java. The 6.5 Mw earthquake that struck near Bawean on March 22, 2024, caused severe damage to houses and public facilities, emphasizing the region’s seismic susceptibility. PSHA results show that Bawean has a high seismic hazard triggered by the reactivation of shallow crustal faults in the Java Sea. The Peak Ground Acceleration (PGA) for a 475-year return period ranges from 0.1g to 0.3g, while short-period Spectral Acceleration (SA 0.2s) reaches 0.48–0.67g in northern areas. High ground-motion amplification (Ao > 1.5) over soft alluvial deposits increases vulnerability, particularly for low-rise rigid structures such as hospitals and schools. The study recommends microzonation-based spatial planning, structural retrofitting of existing public facilities, and the establishment of a localized earthquake-resistant building code to enhance Bawean’s disaster resilience.References
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