Efficient imaging of single-hole electromagnetic data Page: 3 of 33
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suitable for modeling EM fields in complex structures with large-scale conductivity variations. In
principle, the IE method can handle these models too, but the huge demand on computer
resources places a practical limit on its use. This is because of the full matrix arising from IE
formulation. Another advantage of the IE method over the FD or FE method is its greater
suitability for inversion. IE formulation readily contains a sensitivity matrix, which can be
revised at each inversion iteration at little expense. With FD or FE, in contrast, the sensitivity
matrix has to be recomputed at each iteration at a cost nearly equal to that of full forward
modeling. The IE method, however, has to overcome severe practical limitations imposed on the
numerical size of the anomalous domain for inversion purposes. In this direction, several
approximate methods, such as the localized nonlinear (LN) approximation (Habashy et al., 1993)
and quasi-linear approximation (Zhdanov and Fang, 1996), have been developed recently. In this
paper we exploit the advantage of the LN approximation with applications to single-hole
inversion of EM data.
ApproachMaxwell's equations with an e*lW time dependence, neglecting displacement currents,
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Lee, Ki Ha; Kim, Hee Joon & Wilt, Mike. Efficient imaging of single-hole electromagnetic data, article, April 1, 2002; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc735587/m1/3/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.