Abstract
Observatory magnetic data can be used to eliminate the errors caused by the mis-orientation of receivers and noise in magnetotelluric data. Based on the experience on land data, we propose that magnetic observatory data may be used to find the correct orientation of the receivers in the oceanic floor (which is unknown for MMT system without electronic compass), comparing, at different angle values, coherences between magnetic observatory data and single site data. Knowing orientation of the receiver, we use remote reference to generate apparent resistivity and phase of sites. In this work, magnetic data from Vassouras Magnetic Observatory (VSS, Observatorio Nacional, SE Brazil) were used as remote reference (RR) for marine magnetotelluric (MMT) data acquired in Santos basin, to find the right orientation of receivers used in the measurement. To test this procedure, we have compared array data acquired in Para State, near Tatuoca magnetic observatory, which have known directions, with magnetic data from Tatuoca Observatory(RR in this case), to test the procedure before applying on MMT data.
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