On applicability of the Tikhonov-Cagniard magnetotelluric model for sounding of a non-uniform medium

Details On applicability of the Tikhonov-Cagniard magnetotelluric model for sounding of a non-uniform medium On applicability of the Tikhonov-Cagniard magnetotelluric model for sounding of a non-uniform medium

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...53..343a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 53, Issue 3-4, p. 343-349.

Physics

4

Scientific paper

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 Lf >> max(λ0, λL), where Lf is the characteristic field scale, λ0=Z0-/(-iωμ0), λL=[J/(S-1+Z0)]1/2, S is conductance of subsurface layer, and Z0- 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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