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- W2121052011 abstract "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 [Formula: see text] by a linear transformation of the normal (primary) field: [Formula: see text], where [Formula: see text] 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." @default.
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- W2121052011 date "1996-05-01" @default.
- W2121052011 modified "2023-09-27" @default.
- W2121052011 title "Quasi‐linear approximation in 3-D electromagnetic modeling" @default.
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- W2121052011 doi "https://doi.org/10.1190/1.1443994" @default.
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