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Effect of approximating 2-D geoelectric fault plane by using 1-D inversion result in magnetotelluric sounding



Effect of approximating 2-D geoelectric fault plane by using 1-D inversion result in magnetotelluric sounding



Shiyou Diqiu Wuli Kantan = Oil Geophysical Prospecting 32(4): 589-595



Nowadays, 1-D inversion is still the most commonly-used method in interpretation of magnetotelluric sounding data. Unfortunately, the contour map derived from the 1-D inversion method can hardly display the shape and size of 2-D geoelectric fault plane. If we introduce cutoff resistivity, the shape and size of geoelectric fault plane can be determined roughly. In this paper, finite element method is taken to obtain the apparent resistivity sounding curves relating to magnetotelluric TE and TM polorizations over four kinds of 2-D geoelectric fault planes. The inversion involves Bostick method and least-square iterative method.

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