Impedances for induction soundings of the Earth’s mantle |
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Authors: | Vladimir Yu Semenov Vladimir N Shuman |
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Institution: | 1.Institute of Geophysics,Polish Academy of Sciences,Warszawa,Poland;2.Institute of Geophysics,National Academy of Sciences of Ukraine,Kiev,Ukraine |
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Abstract: | Determination of impedances is necessary in order to eliminate some shortcoming of our knowledge about structures of the exciting
source fields and their fickleness. The experimental impedances for induction soundings result from the impedance boundary
conditions or heuristic models. The simplified models give just a rough idea of their domain of applicability. Impedances
can depend on many factors, including the exciting field structures of several source types which are present in the period
range of the mantle soundings (104−4×108 s). The problem in the mantle investigations arises if impedances measured by different methods have to be jointly inverted
in order to essentially prolongate the analyzed period range and hence to increase the reliability and depth of induction
soundings on land. The subject of our work is an analysis of the known magnetotelluric and magnetovariation impedances to
suggest a physically substantiated approach for their joint inversions. |
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