Simulation of the seismic response of sedimentary basins with constant-gradient velocity along arbitrary direction using boundary element method: SH case
Zengxi Ge
Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Simulation of the seismic response of sedimentary basins with constant-gradient velocity along arbitrary direction using boundary element method: SH case
Zengxi Ge
Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China
摘要We presented a boundary element method using the approximate analytical Green’s function given by Sánchez-Sesma et al. Coordinate transform is introduced to extend the method to deal with the model with constant-gradient velocity along oblique direction. The method is validated by comparing the numerical results with other independent methods. This method provides a useful tool for analyzing local site effects. We computed seismic response for two series of models. The results in both frequency and time domains are analyzed and show complex amplification patterns. The fundamental mode of resonance is dependent not only on the velocity at the free surface but also on the velocity distribution of the whole basin. For the higher modes of vibration the heterogeneous basin also has its own characteristic.
Abstract:We presented a boundary element method using the approximate analytical Green’s function given by Sánchez-Sesma et al. Coordinate transform is introduced to extend the method to deal with the model with constant-gradient velocity along oblique direction. The method is validated by comparing the numerical results with other independent methods. This method provides a useful tool for analyzing local site effects. We computed seismic response for two series of models. The results in both frequency and time domains are analyzed and show complex amplification patterns. The fundamental mode of resonance is dependent not only on the velocity at the free surface but also on the velocity distribution of the whole basin. For the higher modes of vibration the heterogeneous basin also has its own characteristic.
基金资助:the National Science Foundation of China (Nos. D40444002 and D40521002) and National Key Basic Research Program (No.2006CB705803)
通讯作者:
Zengxi Ge
E-mail: zge@pku.edu.cn
引用本文:
Zengxi Ge. Simulation of the seismic response of sedimentary basins with constant-gradient velocity along arbitrary direction using boundary element method: SH case[J]. 《地震学报》英文版, 2010, 23(2): 149-155.
Zengxi Ge. Simulation of the seismic response of sedimentary basins with constant-gradient velocity along arbitrary direction using boundary element method: SH case. Earthquake Science, 2010, 23(2): 149-155.