In order to reduce earthquake disasters, Indonesia needs a regional planning based on the disaster mitigation. It is also necessary to make people aware of the risk of earthquakes. By using tool that can simulate the damage caused by an earthquake, an increase in the public awareness of earthquake hazards can be expected and it will enrich the regional planning based on disaster mitigation.
This study focused on the Yogyakarta Earthquake that occurred on May 27, 2006. This study employed an application of RADIUS program to estimate the damage of the buildings and number of casualties in Klaten Regency. The estimated number of the damaged buildings was much smaller than the actual damage while the number of casualties was rather close.
Considering the limitation of the RADIUS method and the conditions in Indonesia, we made some revision of the RADIUS program, such as: the effect by the movement of the fault into attenuation, the higher vulnerability function of the brick masonry houses, the smaller casualty coefficient of the temporary and semi-temporary houses, and the definition of the day time, considering the actual intensities, construction methods, and life style in Klaten Regency. After these revisions, the RADIUS estimate came to be much closer to the actual damage. The revised RADIUS program is more suitable for Indonesia. It is expected that the revised program will be used in other areas in Indonesia with slight modification, considering the differences in local conditions.