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ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Geomagnetism and Paleomagnetism
Volume 12 - 2024 |
doi: 10.3389/feart.2024.1454962
A study of 3D axis anisotropic response of MT
Provisionally accepted- Heilongjiang University, Harbin, China
Electrical anisotropy has a significant impact on the observation data of the magnetotelluric (MT) method; therefore, it is necessary to develop forward and inverse methods in electrical anisotropic media. Based on the axis anisotropic electric field control equations, forming a large linear equation through staggered finite difference approximation, adding boundary conditions, and using the quasi-minimum residual method to solve the equation, this study obtained MT forward modeling results in axis anisotropic media. The correctness of the algorithm was verified by comparing it with the 2D quasi-analytic solution. By designing several sets of axis anisotropic 3D models, the characteristics of the apparent resistivity tensor and tipper were analyzed. The results indicated that the a xy , a yy and zy T are sensitive to changes in resistivity in the X direction of the anomalous body, whereas the a yx , a xx and zx T are sensitive to changes in resistivity in the Y direction. The apparent resistivity tensor and tipper are insensitive to changes in resistivity in the Z direction of the anomalous body. For exploration of anisotropic media, the apparent resistivity tensor and tipper of MT can identify the changes in resistivity in two horizontal axes directions and the boundaries of the anomalous body, which has the advantages for exploration.
Keywords: MT, axis anisotropy, Response characteristic, Finite difference method, Forward - backward algorithm
Received: 26 Jun 2024; Accepted: 12 Aug 2024.
Copyright: © 2024 Liu and Sun. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Xiao Liu, Heilongjiang University, Harbin, China
Qi-Ji Sun, Heilongjiang University, Harbin, China
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