|PSM/FDM Hybrid simulation of the 1999 Chi-Chi, Taiwan, earthquake|
Takashi Furumura , K.-L. Wen, Kazuki Koketsu
Numerical 3D simulation of strong ground motion for the 1999 Chi-Chi, Taiwan (Mw 7.6) earthquake was conducted by using the parallel PSM/FDM hybrid method. Comparisons between simulation results and a remarkable data sets from dense strong motion network in Taiwan demonstrate clearly that the variation in the subsurface structure and the complexity in the fault slip distribution played very important role on the generation of the strong ground motion; The directivity effect of rupturing fault produced large S-wave pulses along the direction of fault rupture. Large velocity gradient in the upper crust of Taiwan propagate the S-wave for longer distances without attenuation. The seismic wave is finally amplified further by the site amplification effect of basin structure, and caused the severe strong motion damage.
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