Three-dimensional inversion of magnetotelluric data with static shifts

Yutaka Sasaki; Toshihiro Uchida

doi:10.1071/ASEG2001ab127

ISSN: 2202-0586
E-ISSN:

oa Three-dimensional inversion of magnetotelluric data with static shifts
Authors Yutaka Sasaki^a and Toshihiro Uchida^b
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^a Kyshu University, Fukuoka 812-8581, Japan, [email protected] ^b Geological Survey of Japan, Tsukuba 305-8567, Japan, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2001, Issue ASEG2001 - 15th Geophysical Conference, Dec 2001, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2001ab127
- Published online: 01 Dec 2001

Abstract

The static shifts caused by small-scale shallow resistivity anomalies hamper the interpretation of magnetotelluric (MT) data. In this paper, an approximate three-dimensional inversion scheme is developed that inverts jointly for resistivities and static-shift values. The unknown static-shift parameters are incorporated into the inverse problem based upon an assumption that they are Gaussianly distributed. A staggered-grid finite-difference method is used to calculate the MT responses in three dimensions. The sensitivities of the MT responses to subsurface resistivity changes are calculated from the analytic solutions of the electric field for a homogeneous half-space model using the adjoint-equation approach. These approximate sensitivities are used throughout iterations, which results in a substantial saving in the computation time over the full inversions. A synthetic example indicates that the inversion scheme recovers the resistivity structure from the data contaminated heavily with static shifts.

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2026-01-16

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References

deGroot-Hedlin, C, 1991, Removal of static shift in two dimensions by regularized inversion: Geophysics 56, 2102-2106.
Mackie, R.L. and Madden, T.R., 1993, Three-dimensional magnetotelluric inversion using conjugate gradients: Geophys. J. Int., 115,215-229.
McGillivray, P.R., Oldenburg, D.W., Ellis, R.G., and Habashy, T.M., 1994, Calculation of sensitivities for the frequency-domain electromagnetic problem: Geophys. J. Int., 116, 1-4.
Newman, G.W. and Alumbaugh, D.L., 2000, Three-dimensional magnetotelluric inversion using non-linear conjugate gradients: Geophys. J. Int., 140, 410-424.
Ogawa, Y. and Uchida, T., 1996, A two-dimensional magnetotelluric inversion assuming Gaussian static shift: Geophys. J. Int., 126, 69-76.
Smith, J.T., 1996, Conservative modeling of 3-D electromagnetic fields, Part II: Biconjugate gradient solution and an accelerator: Geophysics, 61, 1319-1324.
Yamane, K., Kim, H.J., and Asida, Y., 2000, Three-dimensional magnetotelluric inversion using a generalized RRI method and its application: Butsuri Tansa (Geophysical Exploration), 53, 234-244.
Zhdanov. M.S., Fang, S., and Hursan, G, 2000, Electromagnetic inversion using quasi-linear approximation: Geophysics, 61, 1501-1513.

/content/journals/10.1071/ASEG2001ab127

Article Type: Research Article

Keyword(s): 3-D inversion; magnetotellurics; static shift

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oa Three-dimensional inversion of magnetotelluric data with static shifts

Abstract

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