Meshing effects of the 3-D FEM numerical modeling in seismo-electromagnetics:An application in selectivity of seismic electric signal (SES)  

作　　者：Qiao Wang Guangjing Xu Zhanhui Li Qinghua Huang 

机构地区：[1]Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China

出　　处：《Earthquake Science》2011年第6期565-576,共12页地震学报（英文版）

基　　金：partially supported by the National R & D Special Fund of Public Welfare Industry(No.200808069);National Natural Science Foundation of China(Nos.40974038 and 41025014);the Joint Research Collaboration Program by the Ministry of Science and Technology of China(No.2010DFA21570)

摘　　要：We investigated how density and quality of mesh around interest domain affect electromagnetic （EM） responses of 3D Earth layered media using finite element method （FEM）. Effect of different mesh shapes was also investigated using a method of mixing structured and unstructured mesh. As a case study, we estimated the effects of meshing on selectivity phenomenon of seismic electric signal （SES）. Our results suggest that the relative errors resulting from mesh effects may not be negligible, which may lead to some unconvincing explanation of the SES selectivity based on the numerical modeling results.We investigated how density and quality of mesh around interest domain affect electromagnetic （EM） responses of 3D Earth layered media using finite element method （FEM）. Effect of different mesh shapes was also investigated using a method of mixing structured and unstructured mesh. As a case study, we estimated the effects of meshing on selectivity phenomenon of seismic electric signal （SES）. Our results suggest that the relative errors resulting from mesh effects may not be negligible, which may lead to some unconvincing explanation of the SES selectivity based on the numerical modeling results.

关 键 词：3D electromagnetic numerical modeling FEM MESHING SES 

分 类 号：P315.721[天文地球—地震学]