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dc.contributor.authorHering, P.
dc.contributor.authorBrown, Colin
dc.contributor.authorJunge, A.
dc.identifier.citationHering, P., Brown, C., & Junge, A. (2019). Magnetotelluric Apparent Resistivity Tensors for Improved Interpretations and 3-D Inversions. Journal of Geophysical Research: Solid Earth, 124(8), 7652-7679. doi: 10.1029/2018jb017221en_IE
dc.description.abstractThe complex magnetotelluric (MT) apparent resistivity tensor can be decomposed into two real tensors, the apparent resistivity and the resistivity phase tensors, which represent relationships between the observed electric field at a point on the Earth's surface and an associated apparent current density. We explain the differences between these tensors and conventional estimates of apparent resistivity and phase for simple resistivity environments and demonstrate, using canonical models in 1-D and 2-D environments, that both tensors are more sensitive to vertical and horizontal resistivity gradients than their conventional counterparts. The properties of the new tensors are explained using electromagnetic induction theory and the effects of associated charges at resistivity boundaries. We introduce a new way to plot tensor ellipses, which brings significant improvements to the interpretation of MT data, using appropriate visualization software. The apparent resistivity tensor gives information about the magnitude and direction of apparent resistivity subsurface structures and has a strong response to vertical resistivity contrasts. The resistivity phase tensor is highly sensitive to vertical boundaries and the associated fields in the TM mode. It is also free from static distortions under the same conditions implied for the conventional phase tensor. These findings have prompted a study in the potential of the new tensors for 3-D inversions. The results from a 3-D inversion of a canonical oblique conductor straddling two quarter spaces show distinct improvements in resolving the boundaries of the conductor and open a promising field for future studies.en_IE
dc.description.sponsorshipColin Brown was supported by the Griffith Geoscience Award from the Department of Communications, Energy and Natural Resources under the National Geoscience Programme 2007–2013. The views and recommendations contained in this study reflect the views of the authors and do not necessarily reflect the views and opinions of the Irish Minister for Communications, Energy and Natural Resources. The results are all based on synthetic studies, and no data have been used. The reviews by two anonymous reviewers and the comments from Max Moorkamp significantly improved the manuscript.en_IE
dc.publisherAmerican Geophysical Union (AGU)en_IE
dc.relation.ispartofJournal Of Geophysical Research-Solid Earthen
dc.subjectPHASE TENSORen_IE
dc.subjectTIPPER VECTORen_IE
dc.titleMagnetotelluric apparent resistivity tensors for improved interpretations and 3-D inversionsen_IE
dc.contributor.funderGriffith Geoscience Award, Department of Communications, Energy and Natural Resources, Irelanden_IE
dc.local.contactColin Brown, Ryan Institute, Room 223, Martin Ryan Building, Nui, Galway. 2691 Email:

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