Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.160..804s&link_type=abstract
Geophysical Journal International, Volume 160, Issue 15, pp. 804-814.
Astronomy and Astrophysics
Astronomy
17
3-D Effects, 3-D Inversion, Electromagnetic Induction, Magnetotellurics
Scientific paper
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, Zxx and 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.
Egbert Gary
Siripunvaraporn Weerachai
Uyeshima Makoto
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