Abstract
Analysis of magnetotelluric (MT) sounding studies in western Yakutia showed that amplitude curves are strongly affected by the regional distribution of electrical conductivity heterogeneities of the sedimentary cover, while phase curves are distorted to a lesser extent. The distribution of the longitudinal conductance in the sedimentary cover is constructed, and MT fields and resistivity and phase curves are modeled. Based on combined analysis of experimental and model data and results of inversion of corrected curves, an interpretation of main anomalies of MT fields is given and a regional crustal anomaly of the electrical conductivity is discovered.
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