Effect of a large-scale three-dimensional sedimentary basin on Rayleigh wave propagation by using spectral element method combined with frequency-wavenumber method
Zhenning BA , Chenyang KUO , Fangbo WANG , Jianwen LIANG
Front. Struct. Civ. Eng. ›› 2025, Vol. 19 ›› Issue (7) : 1173 -1191.
Effect of a large-scale three-dimensional sedimentary basin on Rayleigh wave propagation by using spectral element method combined with frequency-wavenumber method
Site effects study has always been a key research topic in earthquake engineering. This study proposes a hybrid method to analyze large-scale three-dimensional sedimentary basin under Rayleigh (R) wave incidence. The proposed hybrid method includes two steps: 1) calculate the free field responses of layered sites subjected to R-wave using the frequency-wavenumber method; 2) Simulate the local site region using spectral element method with the equivalent forces input computed from the free field responses. A comprehensive verification study is conducted demonstrating the accuracy of this method. To investigate the effect of sedimentary basin on R-wave propagation, a parametric study is performed on the medium impedance contrast ratio of sedimentary basins and the incident seismic wave predominant frequency, revealing the scattering patterns of sedimentary basins under R-wave incidence. Finally, a practical case of the Wudu Basin in the Tibetan Plateau region of China is simulated. Results indicate significant amplification of R-wave by sedimentary basin, and the proposed hybrid method could serve as a reliable and efficient approach for large-scale R-wave propagation simulation.
Rayleigh wave / hybrid method / basin effect / wave propagation / spectral element method
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Higher Education Press
Supplementary files
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