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• W2056566008 abstract "Price's equation for thin sheet models, approximating the distribution of the surface conductance in Czechoslovakia, is solved to estimate the long period telluric distortions generated by near-surface inhomogeneous conductors. Yegorov's numerical approach is applied to obtain the distribution of the current function across the models and the telluric parameters in the case when no electrical connection with the substratum is allowed. Further, the bimodal induction in the same thin sheets is used for estimating the responses of the S-layer covering different layered structures, which correspond to deep geoelectrical models beneath two provinces of Czechoslovakia with different geological histories. The results are tested on simplified 2D models corresponding to specific geoelectrical structures in Czechoslovakia. The analyses performed allow to conclude that:1.(i)|qualitatively, the long period unimodal thin sheet modelling gives an approximately correct idea of the principal directions of telluric distortions; from the quantitative point of view, however, it leads to grossly exaggerated estimates of the anisotropy of the telluric distortions; in this respect the bimodal induction technique yields reliable results;2.(ii)|large eccentricities of experimental long period polar impedance diagrams in the Bohemian Massif cannot be explained by thin sheet effects; they are most likely of deep origin and may indicate regional inhomogeneity of the asthenospheric layer beneath Central Europe;3.(iii)|in the transition zone between the Bohemian Massif and West Carpathians, connected with electrical inhomogeneities reaching deep into the crust and upper mantle depths, both the bimodal and more so the unimodal thin sheet modelling fail in fitting the experimental magnetotelluric data. (i)|qualitatively, the long period unimodal thin sheet modelling gives an approximately correct idea of the principal directions of telluric distortions; from the quantitative point of view, however, it leads to grossly exaggerated estimates of the anisotropy of the telluric distortions; in this respect the bimodal induction technique yields reliable results; (ii)|large eccentricities of experimental long period polar impedance diagrams in the Bohemian Massif cannot be explained by thin sheet effects; they are most likely of deep origin and may indicate regional inhomogeneity of the asthenospheric layer beneath Central Europe; (iii)|in the transition zone between the Bohemian Massif and West Carpathians, connected with electrical inhomogeneities reaching deep into the crust and upper mantle depths, both the bimodal and more so the unimodal thin sheet modelling fail in fitting the experimental magnetotelluric data." @default.
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• W2056566008 date "1990-01-01" @default.
• W2056566008 modified "2023-09-29" @default.
• W2056566008 title "Limitations of the unimodal thin sheet modelling of near-surface inhomogeneities in Czechoslovakia" @default.
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• W2056566008 doi "https://doi.org/10.1016/0031-9201(90)90252-s" @default.
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