Abstract
Electrical anisotropy is a property of the Earth materials that can be studied through electromagnetic geophysical methods, such as magnetotellurics. It consists of the electrical conductivity changing with the orientation and being mathematically characterized by the conductivity tensor. In order to better understand the conductivity tensor and provide more effective tools for quantitatively analyzing the conductivity tensor of anisotropic structures, three graphical representations for symmetric tensors using ellipsoids, Mohr circles and geometric forms are presented. The ellipsoid representation can be applied to indicate the strength of the anisotropy in different directions. The Mohr circle provides a graphic representation of a tensor as a function of the rotation of the coordinate system. For the geometric forms, one-dimensional (1-D), two-dimensional (2-D) and three-dimensional (3-D) sheet models with given parameters (sizes and resistivities of the constituent prisms), the macroscopic anisotropic conductivity may be calculated using the closed-form mathematical formulas. These three graphical representations have different abilities for revealing information on the conductivity tensor. Four synthetic examples involving uniaxial or biaxial anisotropic conductivity structures are examined in the principal axis coordinate system to investigate the advantages and disadvantages of the graphical displays.
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Acknowledgements
The research was supported by the National Natural Science Foundation of China (Grant Nos. 41474054, 40774035 and 41776079). The authors thank Dr. Pilar Queralt (Editor) and two reviewers Dr. Ian Ferguson and Dr. Anna Martí for their thorough reading of the manuscript and for their insightful comments and constructive suggestions which certainly improved the quality of this paper.
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Yang, Cf., Qin, Lj. Graphical Representation and Explanation of the Conductivity Tensor of Anisotropic Media. Surv Geophys 41, 249–281 (2020). https://doi.org/10.1007/s10712-019-09581-5
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DOI: https://doi.org/10.1007/s10712-019-09581-5