Data Space Occam’s Inversion: Three-Dimensional Magnetotelluric Case

Weerachai Siripunvaraporn; Gary Egbert; Mokoto Uyeshima

doi:10.1071/ASEG2003_3DEMab017

ISSN: 2202-0586
E-ISSN:

oa Data Space Occam’s Inversion: Three-Dimensional Magnetotelluric Case
Authors Weerachai Siripunvaraporn^a, Gary Egbert^b and Mokoto Uyeshima^c
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^a Department of Physics, Faculty of Science, Mahidol University, Rama VI Rd., Rachatawee, , Bangkok, , 10400, THAILAND ^b College of Oceanic & Atmospheric SciencesOregon State Universitya, Corvallis, , OR, 97331, USA, [email protected] ^c Earthquake Research InstituteUniversity of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, , 113-0032, JAPAN, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2003, Issue 3D Electromagnetics, Apr 2003, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2003_3DEMab017
- Published online: 01 Apr 2003

Abstract

A major challenge in 3-D Magnetotelluric (MT) data inversion is the considerable computational resources required. Most efforts at 3-D MT inversion have been formulated directly in the model space, so that the size of all computations depends strongly on the value of M, the number of model space parameters. For geologically realistic 3-D models, M can be quite large, and in particular is typically much larger than the total number of MT impedance data N. By transforming the inversion into the data space, the computational demands can be significantly decreased. In this paper, we present an Occam style 3-D inversion algorithm based on a data space formulation. Inversion results for synthetic data display good convergence. The data space method can also be used with other types of inversion algorithm such as data sub-space techniques. These refinements will allow more efficient and robust 3-D inversion algorithms to be developed.

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2026-01-21

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References

Constable, C. S., Parker, R. L., and Constable, C.G., 1987, Occam’s inversion: A practical algorithm for generating smooth models from electromagnetic sounding data, Geophysics, 52, 289-300.
deGroot-Hedlin, C, and Constable, S., 1990, Occam’s inversion to generate smooth, two-dimensional models from magnetotelluric data, Geophysics, 55, 1613-1624.
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Parker, R. L., 1994, Geophysical Inverse Theory: Princeton University Press.
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Siripunvaraporn, W., and Egbert, G, 2000, An Efficient Data-Subspace Inversion Method for 2-D Magnetotelluric Data, Geophysics, 65, 791-803.
Siripunvaraporn, W., Egbert, G, and Lenbury, Y., 2002, Numerical accuracy of magnetotelluric modeling: A comparison of finite difference approximations, Earth Planets Space, 54, 721-725.

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Article Type: Research Article

Keyword(s): 3-D Inversion; Data-Space Method; Magnetotelluric; Occam’s Inversion,

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