Abstract
A comprehensive analysis by the methods of natural electromagnetic fields, earthquake converted waves, and deep seismic sounding provided detailed constraints on the section of the crust and sedimentary cover in Ciscaucasia and revealed areas of the maximum crustal permeability on the Scythian plate and suture and underthrusting zones in the North Caucasus fold system. Based on seismic and electric evidence, the connected porosity is estimated at 1.5–3%, with the background value being smaller than 0.1%. These junction zones of the Scythian plate and fold block structures of the Main Caucasus Ridge are characterized by a decrease in the electrical resistivity by more than an order of magnitude, a more than fivefold drop in converted wave amplitudes, and a decrease in the converted and longitudinal wave velocities by up to 6%.
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