Distortion of magnetotelluric sounding curves by three‐dimensional structures
Name
Park-1985-Distortion of.pdf
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Author(s)
Park, Stephen K.
Date Issued
May 1985
Journal
Geophysics
Publisher
Society of Exploration Geophysicists
Citation
Park, Stephen K. “Distortion of Magnetotelluric Sounding Curves by Three‐dimensional Structures.” GEOPHYSICS 50, no. 5 (May 1985): 785–797. © 1985 Society of Exploration Geophysicists
Version
Final published version
Abstract
Distortions of magnetotelluric fields caused by threedimensional (3-D) structures can be severe and are not predictable using one-dimensional or two-dimensional modeling. I used a 3-D modeling algorithm based upon an extension of a generalized thin sheet analysis due to Ranganayaki and Madden (1980) to examine field distortions in crustal environments. Three major physical mechanisms cause these distortions. These mechanisms are resistive coupling between the electrical mantle and upper crust, resistive coupling between conductive features within the upper crust, and local induction of current loops within good conductors. Each mechanism produces different spatial and frequency effects upon the background field, so identification of the dominant
mechanism can be used as an interpretational aid. I finally use this analysis to identify distortion mechanisms seen in magnetotelluric data from Beowawe, Nevada to aid in an interpretation of that area.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1190/1.1441953
