Abstract
A laterally uniform Earth model excited by a plane wave has been proposed by Tikhonov and Cagniard (T-C) for magnetotelluric sounding. The T-C model applicability for an Earth model with a non-uniform surface layer is discussed. The analytical expression for the kernel of integral transformation of the horizontal electric field into a magnetic one at the surface of a stratified section is derived. It is shown that the T-C model is applicable if L f ⪢ max(| λ 0|, | λ L |), where L f is the characteristic field scale, λ 0=Z 0 −/(−iωμ 0), λ L=[ J/(S −1+Z 0)] 1 2 , S is conductance of subsurface layer, and Z 0 − and J are the impedance and transverse resistance of a laterally uniform stratified basement. The influence of spatial filtration of the electromagnetic field on MT-impedance evaluation is discussed.
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