ИСТИНА

Research on the Earth's deep structure and modern geodynamic processes is still under the attention of scientists. This work is aimed at developing a new approach to study the relationships between the electrical conductivity distribution nature and the spatial confinement of earthquakes hypocenters in seismically active regions such as the Tien Shan. The emergence of earthquake hypocenters is usually the result of increased environmental stress or the presence of decompression zones (faults). In this case, the concentration of seismicity in certain spatial coordinates can be considered as an indicator of modern geodynamic activity, rheological or geological boundaries. At the same time, visualization of the monitoring data processing results is necessary and convenient for quick analysis of a large array of obtained data. We considered a geoelectric model built along the profile of deep magnetotelluric sounding (DMTS) (end points of the profile lie within 41.3°-42.5°, the profile bending area is between longitudes 75.2°±0.2° E), which resistivity values are shown in colors. For this profile, from the KNET local network bulletins (2015-2019), a corresponding sample of the hypocenters of seismic events was made to compare their distribution with the geoelectric structure. Both graphs (geoelectric model and distribution of earthquake hypocenters) have an axial scale in kilometers - vertical characterizes depth, and horizontal refers to the profile length. Further analysis of such graphs shows that the boundaries of geoelectric heterogeneities correlate well with the earthquake hypocenters spatial distribution. The basis of a complex deep geological and geophysical model of the Earth's crust and upper mantle of the Tien Shan is a fault-block model constructed after the interpretation of geological and geophysical data. It indicates the presence of a certain relationship: the earthquakes hypocenters fall on the boundaries of objects and outline geological bodies, or are located inside certain zones. The distribution nature of the geoelectric heterogeneities and earthquake hypocenters along the profile proves the existence of mechanically weakened layers in the Tien Shan lithosphere. The study was supported by the State Assignment of the Research Station of the Russian Academy of Sciences in Bishkek (AAAA-A19-119020190063-2).