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• W4254248257 abstract "PreviousNext No AccessThree-Dimensional Electromagnetics8. 3-D Conductivity Models: Implications of Electrical AnisotropyAuthors: Peter WeideltPeter WeideltInstitute of Geophysics and Meteorology, Technical University of Braunschweig, Braunschweig, GermanySearch for more papers by this authorhttps://doi.org/10.1190/1.9781560802154.ch8 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Electrical anisotropy in the Earth is usually a scale effect, created by averaging over structures with a preferred orientation. Homogenization theory applied to typical geological structures can help to determine the range of values to be expected in electrically anisotropic formations. The staggered-grid finite-difference method for Maxwell's equations can easily accommodate anisotropic regions, without a significant increase in computational load. A simple magnetotelluric model shows that, in elongated anisotropic structures, the tipper is no longer perpendicular to the strike direction; thus, the electric and magnetic polarizations are mixed. Permalink: https://doi.org/10.1190/1.9781560802154.ch8FiguresReferencesRelatedDetailsCited ByEvolution of eastern segment of the Central India Tectonic Zone: an insight from a magnetotelluric study23 February 2022 | Geophysical Journal International, Vol. 230, No. 1Goal-Oriented 3-D Time-Domain Marine CSEM Modeling With Anisotropy and TopographyIEEE Transactions on Geoscience and Remote Sensing, Vol. 60Three‐Dimensional Inversion of Magnetotelluric Data for a Resistivity Model With Arbitrary Anisotropy22 August 2021 | Journal of Geophysical Research: Solid Earth, Vol. 126, No. 8Magnetotelluric responses of three‐dimensional conductive and magnetic anisotropic anomalies14 November 2019 | Geophysical Prospecting, Vol. 68, No. 3Graphical Representation and Explanation of the Conductivity Tensor of Anisotropic Media29 January 2020 | Surveys in Geophysics, Vol. 41, No. 2Anisotropic complex electrical conductivity of black shale and mudstone from the Moffat Shale Group (Ireland)5 December 2019 | Near Surface Geophysics, Vol. 17, No. 6Crustal Magmatism and Anisotropy Beneath the Arabian Shield—A Cautionary Tale16 October 2019 | Journal of Geophysical Research: Solid Earth, Vol. 124, No. 10Electrically Anisotropic Crust From Three‐Dimensional Magnetotelluric Modeling in the Western Junggar, NW China10 September 2019 | Journal of Geophysical Research: Solid Earth, Vol. 124, No. 9Three-dimensional magnetotelluric modelling in anisotropic media using the A-phi method7 February 2019 | Exploration Geophysics, Vol. 50, No. 1Three-dimensional magnetotelluric responses for arbitrary electrically anisotropic media and a practical application23 October 2018 | Geophysical Prospecting, Vol. 66, No. 9Modular implementation of magnetotelluric 2D forward modeling with general anisotropyComputers & Geosciences, Vol. 118Electrical anisotropy in the presence of oceans—a sensitivity study6 February 2018 | Geophysical Journal International, Vol. 213, No. 2The Effects of 3D Electrical Anisotropy on Magnetotelluric Responses: Synthetic Case StudiesWenxin Kong, Changhong Lin, Handong Tan, Miao Peng, Tuo Tong, and Mao Wang19 March 2018 | Journal of Environmental and Engineering Geophysics, Vol. 23, No. 1Three-dimensional magnetotelluric modeling in anisotropic media using edge-based finite element methodJournal of Applied Geophysics, Vol. 149Magnetotelluric Transfer Functions: Phase Tensor and Tipper Vector above a Simple Anisotropic Three-Dimensional Conductivity Anomaly and Implications for 3D Isotropic Inversion20 March 2017 | Pure and Applied Geophysics, Vol. 174, No. 5Treatment of singularity in the method of boundary integral equations for 2.5D electromagnetic modelingGleb Dyatlov, Dmitry Kushnir, and Yuliy Dashevsky16 February 2017 | GEOPHYSICS, Vol. 82, No. 2Fully anisotropic 3-D EM modelling on a Lebedev grid with a multigrid pre-conditioner20 September 2016 | Geophysical Journal International, Vol. 207, No. 3Magnetotelluric tensors, electromagnetic field scattering and distortion in three-dimensional environments28 October 2016 | Journal of Geophysical Research: Solid Earth, Vol. 121, No. 10Canonical decomposition of magnetotelluric responses: Experiment on 1D anisotropic structuresJournal of Applied Geophysics, Vol. 119Efficient 2.5D electromagnetic modeling using boundary integral equationsGleb Dyatlov, Elizaveta Onegova, and Yuliy Dashevsky27 March 2015 | GEOPHYSICS, Vol. 80, No. 3Reexamination of magnetotelluric responses and electrical anisotropy of the lithospheric mantle in the Grenville Province, Canada18 March 2015 | Journal of Geophysical Research: Solid Earth, Vol. 120, No. 3A finite-volume solution to the geophysical electromagnetic forward problem using unstructured gridsHormoz Jahandari and Colin G. Farquharson10 October 2014 | GEOPHYSICS, Vol. 79, No. 6Interpretation of Magnetotelluric Results Using Laboratory Measurements17 April 2013 | Surveys in Geophysics, Vol. 35, No. 1The Role of Electrical Anisotropy in Magnetotelluric Responses: From Modelling and Dimensionality Analysis to Inversion and Interpretation23 May 2013 | Surveys in Geophysics, Vol. 35, No. 1Time-lapse magnetotelluric monitoring of an enhanced geothermal systemJared R. Peacock, Stephan Thiel, Graham S. Heinson, and Peter Reid13 May 2013 | GEOPHYSICS, Vol. 78, No. 3Detectability of 3-D sulphide targets with AFMAGRandall Mackie and M. Donald Watts25 October 2012Artefacts of isotropic inversion applied to magnetotelluric data from an anisotropic Earth5 September 2011 | Geophysical Journal International, Vol. 187, No. 2Electromagnetic Images of the South and Central American Subduction Zones6 June 2011Numerical Modelling in Geo-Electromagnetics: Advances and Challenges28 October 2009 | Surveys in Geophysics, Vol. 31, No. 2Structural electrical anisotropy in the crust at the South-Central Chilean continental margin as inferred from geomagnetic transfer functionsPhysics of the Earth and Planetary Interiors, Vol. 173, No. 1-2Adaptive finite element modelling of two-dimensional magnetotelluric fields in general anisotropic mediaGeophysical Journal International, Vol. 175, No. 3Time-Domain Finite-Difference and Finite-Element Methods for Maxwell Equations in Complex MediaIEEE Transactions on Antennas and Propagation, Vol. 56, No. 8Preliminary Understanding of Near-Field Effect of CSAMT in Electric Azimuthally Anisotropic Half-SpaceYixian Xu and Ruiyong Yue21 June 2012 | Journal of Environmental and Engineering Geophysics, Vol. 11, No. 2MMT forward modeling for a layered earth with arbitrary anisotropyChangchun Yin25 May 2006 | GEOPHYSICS, Vol. 71, No. 3Chapter 5 3-D EM Forward Modeling Using Balance TechniqueAnisotropy Versus Heterogeneity in Continental Solid Earth Electromagnetic Studies: Fundamental Response Characteristics and Implications for Physicochemical StateSurveys in Geophysics, Vol. 26, No. 6Three-Dimensional Electromagnetic Modelling and Inversion from Theory to ApplicationSurveys in Geophysics, Vol. 26, No. 6Anomalous phases exceeding 90° in magnetotellurics: anisotropic model studies and a field exampleGeophysical Journal International, Vol. 155, No. 1An efficient finite‐difference scheme for electromagnetic logging in 3D anisotropic inhomogeneous mediaGEOPHYSICS, Vol. 68, No. 5Electromagnetic induction in a generalized 3D anisotropic earth, Part 2: The LIN preconditionerGEOPHYSICS, Vol. 68, No. 3Conductivity and resistivity tensor rotation for surface impedance modeling of an anisotropic half-space6 November 2002 | Radio Science, Vol. 37, No. 6Electromagnetic induction in a fully 3‐D anisotropic earthGEOPHYSICS, Vol. 67, No. 4A new computation method for a staggered grid of 3D EM field conservative modeling25 June 2014 | Earth, Planets and Space, Vol. 54, No. 5A strategy for rapid solutions in modeling EM induction in anisotropic mediaChester J. Weiss and Gregory A. Newman3 January 2005Effects of anisotropy on the two-dimensional inversion procedureGeophysical Journal International, Vol. 147, No. 33‐D electromagnetic anisotropy modeling using finite differencesGEOPHYSICS, Vol. 66, No. 5Geophysical Signatures and Active Tectonics at the South-Central Chilean Margin3-D finite-difference analysis of electromagnetic response for measurement while drilling Three-Dimensional ElectromagneticsISBN (print):978-1-56080-079-8ISBN (online):978-1-56080-215-0Copyright: 1999 Pages: 725 publication data© 1999 All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means without written permission of the publisherPublisher:Society of Exploration Geophysicists HistoryPublished in print: 01 Jan 1999 CITATION INFORMATION Peter Weidelt, (1999), 8. 3-D Conductivity Models: Implications of Electrical Anisotropy, Geophysical Developments Series : 119-137. https://doi.org/10.1190/1.9781560802154.ch8 Plain-Language Summary PDF DownloadLoading ..." @default.
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