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The effects of 3D electrical anisotropy on magnetotelluric responses; synthetic case studies

Abstract

Using the staggered-grid finite difference method, a numerical modeling algorithm for a 3D arbitrary anisotropic Earth is implemented based on magnetotelluric (MT) theory. After the validation of this algorithm and comparison with predecessors, it was applied to several qualitative and quantitative analyses containing electrical anisotropy and a simple 3D prism model. It was found that anisotropic parameters for rho 1, rho 2, and rho 3 play almost the same role in affecting 3D MT responses as in 1D and 2D without considering three Euler's angles alpha S, alpha D, and alpha L. Significant differences appear between the off-diagonal components of the apparent resistivity tensor and also between the diagonal components in their values and distributing features under the influence of 3D anisotropy, which in turn help to identify whether the MT data are generated from 3D anisotropic earth. Considering the deflecting effects arising from the inconsistency between the anisotropy axes and the measuring axes, some strategies are also provided to estimate the deflecting angles associated with anisotropy strike alpha S or dip alpha D, which may be used as initial values for the 3D anisotropy inversion.


ISSN: 1083-1363
EISSN: 1943-2658
Serial Title: Journal of Environmental & Engineering Geophysics
Serial Volume: 23
Serial Issue: 1
Title: The effects of 3D electrical anisotropy on magnetotelluric responses; synthetic case studies
Affiliation: China University of Geosciences, School of Geophysics and Information Technology, Beijing, China
Pages: 61-75
Published: 201803
Text Language: English
Publisher: Environmental and Engineering Geophysical Society, Englewood, CO, United States
References: 34
Accession Number: 2018-032295
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Environmental & Engineering Geophysical Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201817
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