The magnetotelluric dispersion relations over 2-D structures |
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| Authors: | Gaston Fischer P-A Schnegg |
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| Institution: | institut de Géologie, Universitéde Neuch tel, CH-2000 Neuchtel, Switzerland |
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| Abstract: | The causal properties of the magnetotelluric response, first derived by Weidelt, and Fischer & Schnegg in the 1-D limit, are confirmed numerically in the 2-D limit for the particular structure consisting of two uniform quarter spaces. This finding is of interest from several points of view: (1) the dispersion relations in their 1-D form seem to retain their validity for all 2-D tensor elements, irrespective of any rotation of the coordinate system chosen at the surface; in particular, (2) they appear equally valid for the E- and B-polarization configurations. (3) Whereas the question recently debated in the literature (whether the Earth can always be considered as a linear, passive and causal system) is perhaps not yet entirely resolved, the present empirical demonstration suggests that it may in general be safe to apply the 1-D dispersion relations to structures with 2-D character. |
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| Keywords: | Key words: magnetotellurics |
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