Seismic Hazard Potential in Yogyakarta Based on HVSR Curve Estimation

Abstract In 2006, the Special Region of Yogyakarta was shaken by a destructive earthquake. The United States Geological Survey (USGS) recorded that earthquake had magnitude 6.3 M w at depth 12.5 km below surface triggered strike slip fault activity. severe damage occurred in Bantul district and Klaten district, where area location were far from epicenter. This proves source distance are not only parameters for seismic hazard potential, but rather presence local site effects building conditions. present study aims to determine characteristics soil estimate potential using HVSR method. Horizontal Vertical Spectral Ratio (HVSR) is one method can be used obtain subsurface information single station measurements. Furthermore, inversion Rayleigh wave ellipticity curve 1-D shear velocity (Vs). calculation mapped understand structure beneath area. Based on classification Vs, categorized SD (Stiff soil/soft soil) SC (Very dense soft rock). results mapping analysis indicated an with highest hazard.