Microzonation of Seismic Vulnerability Indices in Sewon District, Bantul Regency

Sewon District has a high earthquake hazard and overlaps with high population as well. Sewon District is the worst damaged area in Yogyakarta earthquake 2006. There have been many studies conducted in Sewon District, but still have limitations such as using a map scale macro of landform and not using validated spatial interpolation methods. This research aims to make spatial modelling of seismic vulnerability indices based on micro-scale landform and predict the region with accurate spatial interpolation method. This research uses a combination of geophysical approach, geomorphology, and geostatical analyst. The results showed that seismic vulnerability indices affected by landform. Getting further south, Seismic vulnerability indices is getting higher. The southern part of the land is dominated by alluvial plains and flood plains. The highest seismic vulnerability indices is in flood plains (44.821-61.120). The result of comparison between inverse distance weighting (IDW) and ordinary kriging method shows that accurate interpolation method in Sewon District is ordinary kriging with semi-variogram model of spherical.