Seismic hazard mitigation for Bengkulu Coastal area based on site class analysis

Abstract

Bengkulu Coastal Area is a zone with high seismicity that has an acceleration of bedrock in the range 0.7-2.0g for the 2% probability of exceedance in 50 years. This area lies above the quarter sediment layers consisting of fluviatile, alluvium and coastal deposits which are very susceptible to undergo seismic hazards. Understanding about surface response spectra and free surface motion based on local site condition is very required in arranging Spatial Plan (RTRW) of Region. The objective of this study is to observe the response on ground surface of Bengkulu Coastal Area during the seismic loading. The site class analysis based on SNI-1726-2012 classification is performed to achieve this goal. The results obtained are surface response spectra and free surface motion, which are furthermore confirmed by the existing RTRW. In general, the conformity would suggest that disaster mitigation strategy should be actualized by the stakeholders.