Human Casualty and Damage Distribution in Relation to Seismic Intensity in the 2006 Central Java Earthquake in Indonesia

Abstract eng:
The 2006 Central Java (Jogyakarta) earthquake occurred on May 27, and caused 140 thousand dwellings collapsed 190 thousand dwellings heavily damaged, and 5,800 human lives lost. The authors made reconnaissance field survey in June, 2006, collected damage statistics and examined GIS distribution. The seismic intensities were estimated by means of questionnaire survey. Obtained results are as follows. (1) Dwelling collapse rate reached 60% and human loss rate exceeded 1.6% along 20km in NNE direction around epicenter. Human loss rates tend to be smaller for the similar levels of dwelling collapse rates in Java where single story dwellings are common, than in the 1995 Kobe earthquake region. (2) Maximum MSK intensity of 8 or larger is estimated in the epicenter area, while it decreases toward the west direction. Probability of human casualty increases while dwelling damage levels worsened and human loss occurred in approximately 12% of households, when a single wall collapsed or two or more walls totally collapsed. (3) Comparison of building types in damage levels indicated that brick houses are more vulnerable than RC buildings and wooden houses. At MSK intensity 8, responses of many brick houses collapsed reaches 0.77 and the highest, while that of RC buildings is 0.44 and that of wooden houses is 0.11.

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