A Coupled Method of Spectral Element and Normal Mode: An Powerful Tool of Modeling the Seismic Waves Propagation in Anisotropic D″Region
详细信息
- 责任者：Zhao Ming (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Zhao Liang
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(4)
- 关键词：弹性波 ; elastic waves ; 核—幔边界 ; core-mantle boundary
- 页码：p.1216-1225
- 图表：illus., 2 tables, 28 refs.
- 分类号：0400
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
We extended a coupled mode/spectral element method(CSEM hereafter),which can efficiently modeling the seismic waves propagation in the anisotropic D″ region.Using the original PREM and a modified transverse isotropic PREM model in D″ region,we calculated synthetic seismograms with a new PC cluster with 128 CPUs and 160GB memory in the Key Laboratory of Earth Deep Interior.The numerical solution was compared with the analytical solution by normal mode method in order to verify the accuracy of CSEM.Comparison shows that in a broad frequency band(10-5~0.125 Hz) the results of the two methods match very well.Besides,the synthetic seismograms of the transverse isotropic PREM model show obvious arrival time differences between SH and SV components.This proved the capability of CSEM to modeling S wave splitting caused by anisotropic media.
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