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A framework for 3-D joint inversion of MT, gravity and seismic refraction data

Moorkamp, M.; Heincke, B.; Jegen, M.; Roberts, A.; Hobbs, R.

A framework for 3-D joint inversion of MT, gravity and seismic refraction data Thumbnail


Authors

M. Moorkamp

B. Heincke

M. Jegen

A. Roberts

R. Hobbs



Abstract

We present a 3-D joint inversion framework for seismic, magnetotelluric (MT) and scalar and tensorial gravity data. Using large-scale optimization methods, parallel forward solvers and a flexible implementation in terms of model parametrization allows us to investigate different coupling approaches for the various physical parameters involved in the joint inversion. Here we compare two different coupling approaches, direct parameter coupling where we calculate conductivities and densities from seismic slownesses and cross-gradient coupling, where each model cell has an independent value for each physical property and a structural similarity is enforced through a term in the objective function. For both types of approaches we see an improvement of the inversion results over single inversions when the inverted data sets are generated from compatible models. As expected the direct coupling approach results in a stronger interaction between the data sets and in this case better results compared to the cross-gradient coupling. In contrast, when the inverted MT data is generated from a model that violates the parameter relationship in some regions but conforms with the cross-gradient assumptions, we obtain good results with the cross-gradient approach, while the direct coupling approach results in spurious features. This makes the cross-gradient approach the first choice for regions were a direct relationship between the physical parameters is unclear.

Citation

Moorkamp, M., Heincke, B., Jegen, M., Roberts, A., & Hobbs, R. (2011). A framework for 3-D joint inversion of MT, gravity and seismic refraction data. Geophysical Journal International, 184(1), 477-493. https://doi.org/10.1111/j.1365-246x.2010.04856.x

Journal Article Type Article
Acceptance Date Oct 17, 2010
Publication Date Jan 1, 2011
Deposit Date Aug 31, 2011
Publicly Available Date Feb 23, 2016
Journal Geophysical Journal International
Print ISSN 0956-540X
Electronic ISSN 1365-246X
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 184
Issue 1
Pages 477-493
DOI https://doi.org/10.1111/j.1365-246x.2010.04856.x
Keywords Inverse theory, Gravity anomalies and Earth structure, Magnetotelluric, Seismic tomography.

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Copyright Statement
This article has been accepted for publication in Geophysical Journal International ©: 2010 The Authors Geophysical Journal International © 2010 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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