Geophysical processes and biosphere: article

Аnnotation: When carrying out geophysical studies, in particular when searching for earthquake precursors, the problem arises of studying the geoelectric structure of the medium at the observation site and its changes in time. This paper develops an approach to solving this problem on the basis of the use of data from long-term monitoring of the medium by vertical electric sounding (VES) methods using a stationary multi-electrode array. The data of the daily VES in the central part of the Garm research area over 12 years are used. According to these data, about 4,000 individual VEZ curves were constructed, and on them - 36 decade average ones. These 36 curves were used to solve the inverse problem within the framework of the horizontal-layered model using the IPI package. On the basis of interpreting the inverse problem solutions, the 4-, 5-, 6- and 7-layer models of the geoelectric section were constructed. These models are compared with the use of different quality criteria. As a result, a 4-layer model is chosen, which can be considered as the best geoelectric section in the sense of minimizing the residual of the solution of the inverse problem, the horizontal-layered approximation of the real (average for the seasons of the year) geoelectric section. Comparison of the available geological and geophysical data with each other and with the results of solving the inverse problem of the VES shows that the 4-layer model of the section is in good agreement with the geological data (drilling, geological mapping), geoelectric (time domain electromagnetic sounding, VES profile) and other studies, carried out at the observation site.