Nonlocal magnetotelluric responses of a 3D inhomogeneous Earth: processing regional data
V.V. Plotkin, A.Yu. Belinskaya, P.A. Gavrysh, A.I. Gubanov
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the RAS, 3, prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Regional magnetotelluric soundings; lateral inhomogeneity; conductivity; source structure; synchronous 2D array data; nonlocal response functions
Pages: 868-876
Abstract
Magnetotelluric responses of a 3D inhomogeneous earth excited by an arbitrary EM field are nonlocal, which is essential in processing regional MTS data. Due regard for this effect requires data acquisition by a dense synchronous 2D array. We suggest to invert the nonlocal MT responses applying correlation of the surface telluric and magnetic components recorded simultaneously at all stations. The new inversion algorithm has been tested using synthetic data that reproduce the conditions of the BEAR experiment.
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