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Forward modeling and inversion of tensor CSAMT in 3D anisotropic media

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Abstract

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 Broyden–Fletcher–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.

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Acknowledgments

The authors are grateful to Jorge Nocedal’s team for providing the LBFGS code.

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Authors and Affiliations

  1. Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing, 100190, China

    Tao Wang

  2. College of Geophysics, Chengdu University of Technology, Chengdu, 610059, China

    Kun-Peng Wang

  3. School of Geophysics and information Technology, China University of Geosciences (Beijing), Beijing, 100083, China

    Kun-Peng Wang & Han-Dong Tan

  4. Key Laboratory of Geo-detection (China University of Geosciences), Ministry of Education, Beijing, 100083, China

    Han-Dong Tan

Authors
  1. Tao Wang
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  2. Kun-Peng Wang
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  3. Han-Dong Tan
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Corresponding author

Correspondence to Kun-Peng Wang.

Additional information

This work is sponsored by National Natural Science Foundation of China (No. 41374078).

Wang Tao received his Ph.D. in Geophysics from the School of Geophysics and Information Technology, China University of Geosciences (Beijing) in 2017. He currently works in the Institute of Electrics, Chinese Academy of Sciences. His main research interests are electromagnetic forward modeling and inversion methods. Email: cugbwt@hotmail.com.

Corresponding author: Wang Kun-Peng received his Ph.D. in Geodetection and Information Technology from the School of Geophysics and Information Technology, China University of Geosciences (Beijing) in 2017. He currently works in the College of Geophysics, Chengdu University of Technology. His main research interests are geophysical exploration theory and applications.

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Wang, T., Wang, KP. & Tan, HD. Forward modeling and inversion of tensor CSAMT in 3D anisotropic media. Appl. Geophys. 14, 590–605 (2017). https://doi.org/10.1007/s11770-017-0644-7

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  • DOI: https://doi.org/10.1007/s11770-017-0644-7

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