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Title: Three-dimensional inversion of magnetotelluric impedance tensor data and full distortion matrix.
Authors: Avdeeva, Anna
Moorkamp, U. Max S.
Avdeev, D.
Jegen, M.
Miensopust, M.
First Published: Jul-2015
Publisher: Oxford University Press (OUP), Royal Astronomical Society
Citation: Geophysical Journal International (2015) 202, 464–481
Abstract: Galvanic distortion of magnetotelluric (MT) data due to small-scale surficial bodies or due to topography is one of the major factors that prevents accurate imaging of the subsurface. We present a three-dimensional algorithm for joint inversion of MT impedance tensor data and a frequency-independent full distortion matrix that circumvents this problem. We perform several tests of our algorithm on synthetic data affected by different amounts of distortion. These tests show that joint inversion leads to a better conductivity model compared to the inversion of the MT impedance tensor without any correction for distortion effects. For highly distorted data, inversion without any distortion correction results in strong artefacts and we cannot fit the data to the specified noise level. When the distortion is reduced, we can fit the data to an RMS of one, but still observe artefacts in the shallow part of the model. In contrast, in both cases our joint inversion can fit the data within the assumed noise and the resulting models are comparable to the inversion of undistorted data. In addition, we show that the elements of the full distortion matrix can be well resolved by our algorithm. Finally, when inverting undistorted data, including the distortion matrix in the inversion only results in a minor loss of resolution. We therefore consider our new approach a promising tool for the general analysis of real field data.
DOI Link: 10.1093/gji/ggv144
ISSN: 0956-540X
eISSN: 1365-246X
Version: Published version (Publisher PDF)
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Geophysical Journal International ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Appears in Collections:Published Articles, Dept. of Geology

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