Application of The Hybrid GMPE for Seismic Hazard Analysis at Banjar City, West Java
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Abstract
Banjar is one of the important cities in West Java Province which is prone to earthquakes. Seismic hazard analysis is very important and needed to support the development and reduce earthquake risk in the city. This paper describes the use of Hybrid GMPE in Probabilistic Seismic Hazard Analysis which applied to Banjar City. The research aims to provide the probability of various ground motions during the expected major earthquakes in the future. Earthquakes data from BMKG and USGS with a radius of 300 km from the City which has been separated from aftershocks are used in this study. Earthquake source modeling is divided into megathrust, shallow crustal, and background. Hybrid GMPE is used in this analysis. Henceforth, the R-CRISIS software is used to calculate the seismic hazard. The results of the study are presented in the form of peak ground acceleration (PGA) and spectral acceleration at bedrock for a 2% probability of being exceeded in 50 years. In general, the seismic hazard at bedrock is higher in the southwest Banjar area and decreases towards the northeast. Hybrid GMPE can be an alternative in updating the seismic hazard map as a mitigation effort to reduce future earthquake risk in this region
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