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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(Received February 20, 2001, revised June 11, 2001, accepted June 15, 2001)
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Furumura, T., Koketsu, K. & Wen, KL. Parallel PSM/FDM Hybrid Simulation of Ground Motions from the 1999 Chi-Chi, Taiwan, Earthquake. Pure appl. geophys. 159, 2133–2146 (2002). https://doi.org/10.1007/s00024-002-8727-6
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DOI: https://doi.org/10.1007/s00024-002-8727-6