Seismic Hazard Analysis of Surface Level in Tasikmalaya City
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Abstract
Learning from Tasikmalaya earthquakes on December 15, 2017 and September 2, 2009, seismic hazard analysis of surface level in Tasikmalaya City become important to do. This study presents seismic hazard estimation of Tasikmalaya City in terms of maximum ground acceleration (PGA) and spectral acceleration at surface level. The latest seismicity data were used to evaluate seismic hazards. There were three seismic source types considered to model seismic sources in the region, including megathrust, shallow crustal, and background source zones. Several Ground Motion Prediction Equations (GMPE) were used to characterize the properties of attenuation. The average shear wave velocity for 30 m depth (Vs30) for site classification were estimated using Multichannel Analysis of Surface wave (MASW). Furthermore, Probabilistic Seismic Hazard Analysis (PSHA) correspond to an exceeded 2% probability within 50 years were carried out to map seismic hazards at surface level by considering the site classification. The analysis showed that the highest seismic hazard at surface level in the Districts of Kawalu, Tamansari, Cibeureum, Mangkubumi, and Purbaratu. This area needs attention because it also has a large population.
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