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Accounting for near-surface inhomogeneities over a horizontally layered section in magnetotelluric sounding |
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| Institution: | 1. V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences, ul. Baltiiskaya 43, Vladivostok, 690041, Russia;2. School of Natural Sciences, Far Eastern Federal University, ul. Sukhanova 8, Vladivostok, 690950, Russia;3. Mining Institute, Far Eastern Branch of the Russian Academy of Sciences, ul. Turgeneva 51, Khabarovsk, 680000, Russia;1. The University of Texas at Austin, Jackson School of Geosciences, Austin, TX 78712, USA;2. Geological Survey of Canada, Calgary, Alberta T2L 2A7, Canada;3. Sonoma State University, Department of Geology, Rohnert Park, CA 94928, USA;1. Sobolev Institute of Geology and Mineralogy, Siberian Branch Russian Academy of Sciences, Koptyuga Pr. 3, Novosibirsk 630090, Russian Federation;2. Diamond and Precious Metal Geology Institute, Siberian Branch Russian Academy of Sciences, Lenina Pr. 39, Yakutsk 677000, Russian Federation;3. School of Physical Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia;4. Research School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia |
| Abstract: | This paper presents a numerical model for the effect of near-surface inhomogeneities over a one-dimensional horizontally layered geoelectric section and the distortions they cause during magnetotelluric sounding (MTS). The electromagnetic field within the layer of near-surface inhomogeneities is calculated using the Trefftz method. Expressions are derived for the boundary conditions on the day surface and on the roof of the underlying inhomogeneity of a horizontally layered medium. These boundary conditions allow for the excitation of TM-mode fields by subsurface inhomogeneities and their penetration into the atmosphere and the underlying medium. The spatial distribution and characteristics of galvanic and inductive distortions over different time periods during MTS have been studied. Experimental data show that accounting for galvanic distortions is possible with synchronous recording of the distribution of components of the electric and magnetic fields in a limited area of the Earth’s surface. |
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