Parallel PSM/FDM Hybrid Simulation of Ground Motions from the 1999 Chi-Chi,Taiwan, Earthquake |
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| Authors: | T Furumura K Koketsu K-L Wen |
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| Institution: | 1.Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032 Japan. E-mails: furumura@eri.u-tokyo.ac.jp; koketsu@eri.u-tokyo.ac.jp,JP;2.Institute of Geophysics, National Central University, Chung-Li, 320-54, Taiwan, ROC. E-mail: wenkl@eqm.gep.ncu.edu.tw,TW |
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| Abstract: | -- A new technique for the parallel computing of 3-D seismic wave propagation simulation is developed by hybridizing the Fourier pseudospectral method (PSM) and the finite-difference method (FDM). This PSM/FDM hybrid offers a good speed-up rate using a large number of processors. To show the feasibility of the hybrid, a numerical 3-D simulation of strong ground motion was conducted for the 1999 Chi-Chi, Taiwan earthquake (Mw 7.6). Comparisons between the simulation results and observed waveforms from a dense strong ground motion network in Taiwan clearly demonstrate that the variation of the subsurface structure and the complex fault slip distribution greatly affect the damage during the Chi-Chi earthquake. The directivity effect of the fault rupture produced large S-wave pulses along the direction of the rupture propagation. Slips in the shallow part of the fault generate significant surface waves in Coastal Plain along the western coast. A large velocity gradient in the upper crust can propagate seismic waves to longer distances with minimum attenuation. The S waves and surface waves were finally amplified further by the site effect of low-velocity sediments in basins, and caused the significant disasters. |
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