Publication: Interpretation of two-dimensional magnetotelluric profile data with three-dimensional inversion: Synthetic examples
Issued Date
2005-03-01
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ISSN
0956540X
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2-s2.0-15944408854
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Mahidol University
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SCOPUS
Bibliographic Citation
Geophysical Journal International. Vol.160, No.3 (2005), 804-814
Suggested Citation
Weerachai Siripunvaraporn, Gary Egbert, Makoto Uyeshima Interpretation of two-dimensional magnetotelluric profile data with three-dimensional inversion: Synthetic examples. Geophysical Journal International. Vol.160, No.3 (2005), 804-814. doi:10.1111/j.1365-246X.2005.02527.x Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/16492
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Title
Interpretation of two-dimensional magnetotelluric profile data with three-dimensional inversion: Synthetic examples
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Abstract
Traditional methods for interpretation of magnetotelluric (MT) profile data are based on 2-D inversion, under the assumption that 3-D complications in the data can be treated as 'geological noise'. We show with synthetic models that fitting 3-D data with a 2-D inversion can result in spurious features, especially if transverse electric (TE) data are used. Inversion of a single profile of MT data with a 3-D algorithm results in significantly more realistic images of structure beneath the data profile, and also allows some resolution of nearby off-profile structure. We also consider the importance of including the on-diagonal impedance tensor terms, Zxxand Zyy, in the inversion. In synthetic test cases, fitting these diagonals improves the accuracy of images of off-profile structure, particularly near the edge of a conductive feature. © 2005 RAS.