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《Chinese Journal of Geophysics》 2017-03
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Three-dimensional modeling of controlled-source audio-frequency magnetotellurics using the finite element method on an unstructured grid

WANG Ya-Lu;DI Qing-Yun;WANG Ruo;Institute of Geology and Geophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Considering both the transmitter-configuration and the complicated characteristics of subsurface media in the controlled-source audio-frequency magnetotellurics survey, a threedimensional finite element modeling method based on an unstructured grid is developed. We solve the secondary field problem to avoid singularity near the source and reduce the computation domain. The governing equations for the secondary electric field are deduced firstly. By incorporating the divergence-free condition, our solution for the electric field is guaranteed to be numerically accurate and physically reasonable. The secondary magnetic field value of high precision is then obtained by Gaussian weighted technique from the electric field. The liability of our algorithm is verified by a comparative study with the IE(Integral Equation) method. Thereafter the electromagnetic responses of some canonical models are simulated and analyzed. The results show that the algorithm is correct and reliable, and suitable for the numerical simulation of 3 D geological models.
【Fund】: 国家重大科研装备研制项目“深部资源探测核心装备研发”(ZDYZ2012-1-05);; 国家重点研发计划(2016YFC0600507);; 国家自然科学基金(41174111)资助
【CateGory Index】: P631.325
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