PROBABILISTIC SEISMIC HAZARD ANALYSIS BALI: FOCUS ON LOCAL EARTHQUAKE SOURCES AND SHALLOW BACKGROUND
DOI:
https://doi.org/10.33579/krvtk.v11i1.6532Keywords:
Bali, PSHA, local earthquake sources, shallow background, seismic hazardAbstract
This study evaluates seismic hazard in Bali Island by considering local fault sources and shallow background seismicity using Probabilistic Seismic Hazard Analysis (PSHA). Peak Ground Acceleration (PGA) was estimated using Ground Motion Prediction Equations (GMPEs) for shallow crustal earthquakes, adjusted to the characteristics of local fault and shallow background sources. The results show that PGA values from local fault sources range from 0.02–0.20 g for a 500-year return period and 0.05–0.30 g for a 2500-year return period. Meanwhile, shallow background sources produce PGA values of 0.02–0.30 g for 500 years and 0.30–0.60 g for 2500 years. Southern Bali shows the highest PGA values, while central and northern Bali exhibit moderate to low values. The integration of both seismic sources provides a more representative hazard map to support risk mitigation, spatial planning, and earthquake-resistant building design.
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