Monitoring of relative changes in the electrical conductivity of rocks from observations of the magnetotelluric apparent resistivity (numerical modeling) |
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| Authors: | M E Sholpo |
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| Institution: | (1) Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, St. Petersburg Branch, Russian Academy of Sciences, Muchnoi per. 2, St. Petersburg, 191023, Russia |
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| Abstract: | A method for direct conversion of observed variations in the magnetotelluric (MT) apparent resistivity ρa into relative variations in the resistivity of elements of a well-studied geoelectric structure is proposed. The method is tested on a 1-D model structure consisting of seven horizontal layers in three of which the conductivity can vary within certain limits. It is inferred that the frequency range and the accuracy of methods of magnetotelluric sounding presently applied to the construction of transfer operators are sufficient for determining relative changes in the resistivity of rocks; the latter, as distinct from ρa, can serve as an effective prognostic parameter. The method can be extended to more complex geoelectric structures. |
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