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The non-inductive galvanic disturbances due to surcial bodies, lying smaller than high frequency skin depth, cause serious interpretational errors in magnetotelluric data. These frequency inde- pendent distortions result in a quasi-static shift between the apparent resistivity curves known as static shift. Two-dimensional modelling studies, for the eects of surcial bodies on magnetotel- luric interpretation, show that the transverse electric (TE) mode apparent resistivity curves are hardly aected compared to the transverse magnetic (TM) mode curves, facilitating the correction by using a curve shifting method to match low frequency asymptotes. But in the case of eld data the problem is rather complicated because of the random distribution of geometry and conductiv- ity of near surface inhomogeneities. Here we present the use of deep resistivity sounding (DRS) data to constrain MT static shift. Direct current sensitivity studies show that the behaviour of MT static shift can be estimated using DC resistivity measurements close to the MT sounding station to appreciable depths. The distorted data set is corrected using the MT response for DRS model and further subject to joint inversion with DRS data. Joint inversion leads to better estimation of MT parameters compared to the separate inversion of data sets.

Effects of galvanic distortions on magnetotelluric data: Interpretation and its correction using deep electrical data