Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities

Sun Chuan-wen; Philip D. Rabinowitz

doi:10.1007/BF02850576

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Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities

OriginalPaper | Updated：2023-05-16

- Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities
- Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities
- 海洋湖沼学报（英文） 1997年15卷第1期页码：7-18
- Affiliations：
  
  Department of Geology and Geophysics
- Author bio：
- Funds：
- DOI：10.1007/BF02850576
  中图分类号：
- 纸质出版：1997
- Accepted：
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Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities[J]. 海洋湖沼学报（英文）, 1997,15(1):7-18.

Chuan-wen, S., Rabinowitz, P.D. Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities., Chin. J. Ocean. Limnol. 15, 7–18 (1997). https://doi.org/10.1007/BF02850576
Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities[J]. 海洋湖沼学报（英文）, 1997,15(1):7-18. DOI： 10.1007/BF02850576.

Chuan-wen, S., Rabinowitz, P.D. Fast approximate inversion of magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities., Chin. J. Ocean. Limnol. 15, 7–18 (1997). https://doi.org/10.1007/BF02850576 DOI：

摘要

Abstract

This paper discusses use of approximations and the Integral Mean Value Theorem to show that 6 coefficients approximately describe the distortions of near surface inhomogeneities on the MT field of a horizontally layered earth model. When these 6 coefficients are considered together with those of the magnetic field of a horizontally layered earth model

the analytic and approximate wave impedance equations can be derived for the MT response of a horizontally layered earth model with near-surface 2-D and 3-D inhomogeneities. These approximate wave impedance equations are used with inverted MT data for 2-D and 3-D forward modelling. Although these 6 coefficients cannot be determined before inversion

initial estimates can be used. The 6 coefficients and the resistivity and thickness of each layer of a horizontally layered earth can be obtained by using published inversion methods. The 6 coefficients give important information (depths and resistivities) on the near-surface inhomogenelties. The authors inverted 2-D and 3-D theoretical models for Fast Approximate Inversion of Magnetotelluric (FAIMT) data for a horizontally layered earth with near-surface inhomogeneities compares favorably with traditional inversion methods

especially for inverting regional or basin structures. This method simplifies

computation and gives a reasonable 1-D geological model with fewer nonuniqueness problems.

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references

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