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The inability of magnetotelluric off-diagonal impedance tensor elements to sense oblique conductors in three-dimensional inversion

The inability of magnetotelluric off-diagonal impedance tensor elements to sense oblique... In this paper, we use synthetic data sets from a profile to demonstrate the importance of aligning the 3-D mesh and data coordinate system with the dominant geo-electrical strike direction in 3-D inverse modelling. The resistivity model investigated consists of a regional, elongated 2-D conductive structure at 45 to the profile. We compare the results of full impedance tensor inversion with the results from inversion of only off-diagonal components of the magnetotelluric impedance tensor. The 3-D inversion result obtained with the complete tensor elements yields the subsurface model closest to the original model, whereas the result of inverting only off-diagonal components is the poor imaging of the continuity of the conductive 2-D body. However, the conductor can be correctly recovered using only the off-diagonal components if the model mesh and the data are aligned with quasi-2-D geo-electrical strike. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Journal International Oxford University Press

The inability of magnetotelluric off-diagonal impedance tensor elements to sense oblique conductors in three-dimensional inversion

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References (21)

Publisher
Oxford University Press
Copyright
The Authors 2013. Published by Oxford University Press on behalf of The Royal Astronomical Society.
Subject
Geomagnetism, rock magnetism and palaeomagnetism
ISSN
0956-540X
eISSN
1365-246X
DOI
10.1093/gji/ggt470
Publisher site
See Article on Publisher Site

Abstract

In this paper, we use synthetic data sets from a profile to demonstrate the importance of aligning the 3-D mesh and data coordinate system with the dominant geo-electrical strike direction in 3-D inverse modelling. The resistivity model investigated consists of a regional, elongated 2-D conductive structure at 45 to the profile. We compare the results of full impedance tensor inversion with the results from inversion of only off-diagonal components of the magnetotelluric impedance tensor. The 3-D inversion result obtained with the complete tensor elements yields the subsurface model closest to the original model, whereas the result of inverting only off-diagonal components is the poor imaging of the continuity of the conductive 2-D body. However, the conductor can be correctly recovered using only the off-diagonal components if the model mesh and the data are aligned with quasi-2-D geo-electrical strike.

Journal

Geophysical Journal InternationalOxford University Press

Published: Mar 1, 2014

Keywords: Numerical solutions Inverse theory Magnetotellurics

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