Axis anisotropic Occam’s 3D inversion of tensor CSAMT in data space

Liu, Xiao; Zheng, Fang-Wen

doi:10.1007/s11770-024-1076-9

Appl. Geophys.

2024

DOI: 10.1007/s11770-024-1076-9

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Axis anisotropic Occam’s 3D inversion of tensor CSAMT in data space

Xiao Liu,

Fang-Wen Zheng

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2024

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Cited by 2 publications

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Response characteristics of 3D tensor CSAMT in axis anisotropic media

Liu,

Gao

2024

Front. Earth Sci.

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Considering the significant impact of anisotropy on forward and inversion results, this paper presents a research study on tensor controlled-source audio magnetotellurics (CSAMT) forward modeling in axis anisotropic media. In this study, the tensor resistivity of axis anisotropic medium is introduced according to the control equation of electric field with sources. The total electric field is decomposed into primary and secondary fields, with the primary field obtained using Key’s algorithm and the secondary field calculated using the finite difference method. This approach enables three-dimensional (3D) modeling of tensor CSAMT in axis anisotropic media. The correctness of the algorithm is verified by comparing it with the results obtained using a two-dimensional (2D) finite element algorithm. Several sets of axis anisotropic 3D models are designed, and the response characteristics of anisotropic target bodies to plane waves and non-plane waves are summarized. The findings indicate that the Cagniard resistivity and tipper are sensitive to changes in the X and Y directions of the anomaly, but not sensitive to changes in resistivity in the Z direction. Additionally, in the near region, non-plane wave CSAMT signals may cause distortion in the Cagniard resistivity. The results highlight that tensor CSAMT has the capability to detect changes in resistivity in two-axis directions (X and Y), providing greater exploration advantages compared to scalar CSAMT. This study provides a foundation for the forward modeling and inversion of tensor CSAMT in arbitrary anisotropic media.

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Response characteristics of 3D tensor CSAMT in axis anisotropic media

Liu,

Gao

2024

Front. Earth Sci.

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A study of 3D axis anisotropic response of MT

Liu,

Sun

2024

Front. Earth Sci.

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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 ρxya, ρyya and Tzy are sensitive to changes in resistivity in the X direction of the anomalous body, whereas the ρyxa, ρxxa and Tzx 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.

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Axis anisotropic Occam’s 3D inversion of tensor CSAMT in data space

Cited by 2 publications

References 24 publications

Response characteristics of 3D tensor CSAMT in axis anisotropic media

Response characteristics of 3D tensor CSAMT in axis anisotropic media

A study of 3D axis anisotropic response of MT

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