矩形クラックモデルおよびアスペリティモデルで生成される短周期地震動に関する検討

抄録

For predicting the strong ground motions from scenario earthquakes, two theoretical equations and one empirical equation are applied to evaluation of the three parameters out of the following six parameters: the area of the entire fault, the seismic moment, the averaged stress drop, the area of the asperity, the stress drop on the asperity, and the amplitude of the acceleration source spectrum in the short-period range. We carried out the dynamic simulation of fault rupturing of rectangular crack models and asperity models to verify the empirical equation relating the stress drop on the asperity and the size of the asperity to the amplitude of the acceleration source spectrum in the short-period range. The background of the fault was found to generate the short-period seismic waves less than the asperity of the fault as granted in the current researches. But, some of our results showed that the background generated the short-period seismic waves as much as the asperity did.