Understanding 1D magnetotelluric apparent resistivity and phase

Alexandra Marsenić

Journal of Electromagnetic Waves and Applications, 2020, vol. 34, issue 2, 246-258

Abstract: A novel approach is applied on 1D magnetotelluric problem, based purely on physical considerations of processes on a layered half-space. Relations for apparent resistivity and impedance phase as functions of frequency were derived on grounds of knowledge of a given model. These are considered to be the best benefit coming from the analysis. Two different systems of a layered half-space were examined theoretically and the results were compared with those gained by the traditionally used recursion formula. The obtained dependences faithfully reflect all prescribed physical features. Understanding of these behaviours can significantly contribute to correct interpretation of measured data. Inflection points of the impedance phase appeared to be the proper diagnostic tool for detection of transitions in conductivity. They provide the pairs frequency – apparent resistivity as an input for inversion. It relies on the derived formulas and for well localized changes gives output in the form of layers' thicknesses and their resistivities.

Date: 2020
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DOI: 10.1080/09205071.2019.1699452

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