Map of Geoelectric Sections of the south of Russia and the Caucasus

Abstract

Detailed knowledge of the electrical properties, structure and spatial arrangement of various rock complexes is necessary in solving problems of radiation and propagation of electromagnetic waves in inhomogeneous media with interfaces of complex shapes. The maps of electrical properties (conductivity or geoelectric sections) of continents and countries constructed on various scales according to certain criteria can serve as initial information for models of the electrical condition of the underlying medium. The electrical inhomogeneous geological medium distorts amplitude-phase structure of an electromagnetic field. Essential increase of accuracy of calculations of an electromagnetic field in a wide frequency band (from VLF and up to MF-SF) became possible with use predictive maps of geoelectric sections (GES), taking into account for the layered structure of the underlying medium. These maps reflect the areal distribution of various GES types, with the electrical resistivity, dielectric permittivity and thickness specified for each layer of GES. These parameters enable the calculation of values of surface impedance, attenuation function and field level in a wide range of frequencies. These values are necessary for prediction of electromagnetic waves propagation conditions. The article contains the results of geoelectric mapping of the territory of the south of Russia and the Caucasus. The methodology of geoelectric mapping is considered. A map of GES of the south of Russia and the Caucasus at a scale of 1:2 500 000 is created. This map makes it possible to increase the accuracy of the calculation of electromagnetic fields by 1,5 to 3 times in comparison with the existing Morgan-Maxwell map.