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    Correction of seafloor magnetotelluric data for topographic effects during inversion

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    2004JB003463.pdf (1.659Mb)
    Date
    2005-12-14
    Author
    Baba, Kiyoshi  Concept link
    Chave, Alan D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3502
    As published
    https://doi.org/10.1029/2004JB003463
    DOI
    10.1029/2004JB003463
    Keyword
     Marine magnetotellurics; Topographic correction; Modeling and inversion 
    Abstract
    The large contrast in electrical conductivity between seawater and the underlying seafloor accumulates boundary electric charges which can severely distort observed electric and magnetic fields. For marine magnetotelluric (MT) studies, correcting this topographic effect is critical to obtaining accurate conductivity models for the mantle. Previously, correction for topography was based on the thin sheet approximation which breaks down at periods under ∼1000 s in the deep ocean. This paper introduces an analysis method for seafloor MT data which combines removal of three-dimensional (3-D) topographic effects with inversion of the data for 2-D structure. The observed MT impedance is first corrected to a flat-lying seafloor datum using the observed bathymetry without invoking the thin sheet approximation. The corrected MT response is then inverted in a flat seafloor model space. Because of coupling between topographic effects and deeper structure, the correction and inversion steps are iterated until changes in each become small. The procedure is verified using synthetic and real data. Tests for synthetic 3-D topography over a half-space show that the method closely recovers the true half-space model after a few iterations. The procedure is also applied to real data collected in the Mantle Electromagnetic and Tomography (MELT) experiment on the East Pacific Rise at 17°S.
    Description
    Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 110 (2005): B12105, doi:10.1029/2004JB003463.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Article: Baba, Kiyoshi, Chave, Alan D., "Correction of seafloor magnetotelluric data for topographic effects during inversion", Journal of Geophysical Research 110 (2005): B12105, DOI:10.1029/2004JB003463, https://hdl.handle.net/1912/3502
     

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