Identification of Seismic Vulnerability in Sleman Regency Based on Site Effect Analysis Using Microtremor Data

Abstract

Yogyakarta is a province in the southern part of Java Island which is close to volcanoes. In this area there are sedimentary 
materials, such as silt, sand, tuff, breccia, agglomerate and conglomerate so that they are at risk of being affected by local 
site effects when an earthquake occurs. This study aims to determine earthquake vulnerable zones in several areas in 
Sleman Regency, including Berbah, Kalasan and Prambanan Districts based on site effect analysis with dominant 
frequency parameters (f0), amplification factor (A0) and seismic vulnerability index (Kg) using micro seismic data with 
data of 27 points which are then processed using the Horizontal to Vertical Spectral Ratio (HVSR) method and micro 
zonation using Geographic Information System (GIS). The results of data processing show that the site class in Sleman 
Regency is divided into 3, namely SD (Medium Soil), SC (Very Dense Soil) and SB (Rock). Areas with rock formations 
with soft soil structures are the most vulnerable areas to earthquakes. The lowest