Quasi-linear approximation in 3-D electromagnetic modeling

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Publication Type Journal Article
School or College College of Mines & Earth Sciences
Department Geology & Geophysics
Creator Zhdanov, Michael S.
Other Author Fang, S. H.
Title Quasi-linear approximation in 3-D electromagnetic modeling
Date 1996-01-01
Description The Born approximation in electromagnetic (EM) numerical modeling has limited application for solving 3-D electromagnetic induction problems, because in structures with high conductivity contrasts and at high frequencies, this approximation is inaccurate. In this paper, we develop a new and relatively simple approximation for the EM field called a quasi-linear approximation, which is based on the evaluation of the anomalous field E ª by a linear transformation of the normal (primary) field: E ª = λEn, where λ is called the electrical reflectivity tensor. The reflectivity tensor inside inhomogeneities can be approximated by a slowly varying function that can be determined numerically by a simple optimization technique. The new approximation gives an accurate estimate of the EM response for conductivity contrasts of more than one hundred to one, and for a wide range of frequencies. It also opens the possibility for fast 3-D electromagnetic inversion.
Type Text
Publisher Society of Exploration Geophysicists
Journal Title Geophysics
Volume 61
Issue 3
First Page 646
Last Page 65
Language eng
Bibliographic Citation Zhdanov, M., & Fang, S. H. (1996). Quasi-linear approximation in 3-D electromagnetic modeling. Geophysics, 61(3), 646-65.
Rights Management (c)Society of Exploration Geophysicists [Include link to article]
Format Medium application/pdf
Format Extent 927,068 bytes
Identifier ir-main,13880
ARK ark:/87278/s6gt65n0
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 705543
Reference URL https://collections.lib.utah.edu/ark:/87278/s6gt65n0
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