Abstract
In the paper the approach based on considerable non-uniformity of electric properties of lithosphere both by depth and by area is developed. Geoelectric sections (GES) of various types of continental lithosphere (rift hollows, crystalline massif, permafrost) to large depths are examined. The substantiation of models of the lithosphere electric conductivity in seismically active and stable areas is considered. The main attention is given to areas of crystalline massif and zones of geoelectric non-uniformities (tectonic faults) attributed to seismic generating structures. The GES of seismoactive area (to the depth of about 60 km, up to 13-15 layers of GES) are studied on an example of the Baikal Rift Zone (BRZ).
Highlights
In the last 10-15 years, a new research direction of geophysics – seismoelectromagnetism [1,2,3,4,5,6] which includes a high-resolution probing of inhomogeneous medium and geophysical monitoring of seismoelectromagnetic emissions in the ULF - VLF - LF bands was formed
The results of geoelectrical mapping by means of air-variant method in VLF range of radiowaves, radio-impedance sounding in ELF-VLF-LF-MF ranges and vertical electric sounding (VES) [20] give sufficiently detailed information concerning surface electric conductivity
The apparent resistivity ρa is equal to about 115 thousands Ohm⋅m even at small base line AB/2
Summary
In the last 10-15 years, a new research direction of geophysics – seismoelectromagnetism [1,2,3,4,5,6] which includes a high-resolution probing of inhomogeneous medium and geophysical monitoring of seismoelectromagnetic emissions in the ULF - VLF - LF bands was formed Researches in this direction are carried out in Japan, USA, China, Greece, Italy, France, Mexico, India and some other countries. An important part of seismoelectromagnetism is the study of the electrical properties (conductivity σ and permittivity ε) crustal seismic areas. This is due to the fact that earthquakes as pulsed mechanical processes always take place in the Earth's crust. The subject is relevant and is in line with global research priorities in the seismoelectromagnetism area
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