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Two‐dimensional magnetotelluric inversion using reflection seismic data as constraints and application in the COSC project
Author(s) -
Yan Ping,
Kalscheuer Thomas,
Hedin Peter,
Garcia Juanatey Maria A.
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl072953
Subject(s) - geology , magnetotellurics , inversion (geology) , precambrian , seismology , reflection (computer programming) , geophysics , paleontology , tectonics , computer science , electrical engineering , electrical resistivity and conductivity , programming language , engineering
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 décollement 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 décollement and the underlying Precambrian basement.