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  Non-Linear Conjugate Gradient Magnetotelluric Inversion for 2-D Anisotropic Conductivities

Pek, J., Santos, F. A. M., Li, Y. (2012 online): Non-Linear Conjugate Gradient Magnetotelluric Inversion for 2-D Anisotropic Conductivities - Protokoll über das 24. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, 24. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung (Neustadt a. d. Weinstraße 2011), 187-206, 20 p.

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_65354 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_65354_1
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http://gfzpublic.gfz-potsdam.de/pubman/item/escidoc:65290 (Supplementary material)
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 Creators:
Pek, Josef1, Author
Santos, Fernando A. M.1, Author
Li, Yuguo1, Author
Affiliations:
1EMTF 2011, EMTF, External Organizations, Neustadt an der Weinstraße, ou_66029              

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 Abstract: We report on the state of the art in the development of a non-linear conjugate gradient (NLCG) version of the 2-D inverse algorithm for magnetotelluric (MT) data over structures with arbitrary electrical anisotropy. The algorithm is based on the Occam inverse strategy. As a direct solver, our 2-D finite volume forward modeling program for structures with arbitrary anisotropy is employed, which is also further used to effectively evaluate parametric sensitivities by employing the reciprocity principle. A standard Polak-Ribiere NLCG algorithm is then applied to minimize the inversion objective function which consists of a data misfit term and of regularization penalties applied to both the structure complexity and anisotropy throughout the model. The algorithm offers considerable savings to the computing time and memory demands due to both the reciprocity-based evaluation of the parametric sensitivities and on-line computation of products of the Jacobian and its transverse with a vector within the CG algorithm. Synthetic test inversions with a single anisotropic box anomaly are presented and used to discuss expected ambiguity issues in anisotropic structures. The 2-D anisotropic inversion is further applied to a small subset of experimental MT data from the contact area of the Southern Portuguese Zone and the Ossa Morena Zone in southern Portugal, and the results are compared with those obtained earlier by a 1-D inverse and 2-D direct trial-and-error modeling approach to the same data.

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Language(s): eng - English
 Dates: 2012
 Publication Status: Published online
 Pages: 20
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 Rev. Type: Internal
 Identifiers: ISSN: 0946-7467
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Title: 24. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung
Place of Event: Neustadt a. d. Weinstraße
Start-/End Date: 2011-09-19 - 2011-09-23

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Title: Protokoll über das 24. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 24 Start / End Page: 187 - 206 Identifier: -