Author(s)

P. Widodo, H. H. Wijaya & Sunarto

Abstract

The 27th May 2006 Yogyakarta earthquake caused more than 5500 casualties and hundreds of thousands of non-engineered buildings collapsed. It is necessary to investigate the seismic intensity, ground acceleration and building damage index. Direct site investigations to collect the severity distribution of objects, humans and environments have been done. The result of the investigation shows that in general isoseismic lines are in-line with Opak fault, the proposed attenuation relationship for seismic intensity and horizontal ground accelerations are matching well with previous research results and the distribution of the building damage index has a similar pattern with isoseismic lines. Keyword: seismic intensity, isoseismic lines, ground acceleration, attenuation, damage index. 1 Introduction According to several sources (Walter et al. [24]; Tsuji et al. [23]), the focus of the 27th May 2006 Yogyakarta earthquake with Mw = 6.2 was at approximately 10 km depth and only 15 km away from Yogyakarta city. Elnashai et al. [7] and Tsuji et al. [23] stated that there are several versions of the location of the epicenter.

Keywords

seismic intensity, isoseismic lines, ground acceleration, attenuation, damage index