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《应用地球物理(英文版)》 2017-04
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Forward modeling and inversion of tensor CSAMT in 3D anisotropic media

Wang Tao;Wang Kun-Peng;Tan Han-Dong;Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences;College of Geophysics, Chengdu University of Technology;School of Geophysics and information Technology, China University of Geosciences (Beijing);Key Laboratory of Geo-detection (China University of Geosciences), Ministry of Education;  
Tensor controlled-source audio-frequency magnetotellurics(CSAMT) can yield information about electric and magnetic fields owing to its multi-transmitter configuration compared with the common scalar CSAMT. The most current theories, numerical simulations, and inversion of tensor CSAMT are based on far-field measurements and the assumption that underground media have isotropic resistivity. We adopt a three-dimensional(3D) staggered-grid finite difference numerical simulation method to analyze the resistivity in axial anisotropic and isotropic media. We further adopt the limited-memory BroydenFletcher-Goldfarb-Shanno(LBFGS) method to perform 3D tensor CSAMT axial anisotropic inversion. The inversion results suggest that when the underground structure is anisotropic,the isotropic inversion will introduce errors to the interpretation.
【Fund】: sponsored by National Natural Science Foundation of China(No.41374078)
【CateGory Index】: P631.325
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