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Two-dimensional magnetotelluric inversion using reflection seismic data as constraints and application in the COSC project
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Zhejiang Univ, Sch Earth Sci, Hangzhou, Zhejiang, Peoples R China..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0003-3819-8182
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0003-1963-2588
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0002-6853-4864
2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 8, 3554-3563 p.Article in journal (Refereed) Published
Abstract [en]

We present a novel 2-D magnetotelluric (MT) inversion scheme, in which the local weights of the regularizing smoothness constraints are based on the envelope attribute of a reflection seismic image. The weights resemble those of a previously published seismic modification of the minimum gradient support method. We measure the directional gradients of the seismic envelope to modify the horizontal and vertical smoothness constraints separately. Successful application of the inversion to MT field data of the Collisional Orogeny in the Scandinavian Caledonides (COSC) project using the envelope attribute of the COSC reflection seismic profile helped to reduce the uncertainty of the interpretation of the main decollement by demonstrating that the associated alum shales may be much thinner than suggested by a previous inversion model. Thus, the new model supports the proposed location of a future borehole COSC-2 which is hoped to penetrate the main decollement and the underlying Precambrian basement.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2017. Vol. 44, no 8, 3554-3563 p.
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-324629DOI: 10.1002/2017GL072953ISI: 000401847500015OAI: oai:DiVA.org:uu-324629DiVA: diva2:1110685
Funder
Swedish Research Council, 2013-5780
Available from: 2017-06-16 Created: 2017-06-16 Last updated: 2017-06-16Bibliographically approved

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Kalscheuer, ThomasHedin, PeterJuanatey, María de los Garcia

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