Correction for distortions of magnetotelluric fields: Limits of validity of the static approach |
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| Authors: | B Sh Singer |
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| Institution: | 1. The Institute of the Physics of the Earth, US Academy of Sciences Troitsk, 142092, Moscow Region, Russia
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| Abstract: | Subsurface inhomogeneities can be classified in three categories depending on the comparison of their sizes against the effective skin depth and “adjustment distance”. These categories are geological noise, local and regional inhomogeneities. Due to its random nature, geological noise leads to uncontrollable distortions of the magnetotelluric field. Such methods as curve shifting, distortion tensor techniques, decomposition and spatial filtering can effectively be used to correct for static shift caused by geological noise. It is shown that the effects of local and regional subsurface inhomogeneities reduce to static shifts of MT-curves when rather rigid conditions are satisfied. The methods used to suppress the effect of geological noise have limited applicability to local and regional inhomogeneities, which can be accurately accounted for only by modelling. |
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