Abstract
The paper presents the results of experiments carried out at the regime points of magnetotelluric monitoring both on the territory of the Bishkek geodynamic test site (Northern Tien Shan) and on a series of monitoring profiles in various geological conditions. Previous studies indicate the relationship of variations in the electromagnetic and seismic fields, lunisolar tidal effects, seismic regime with the processes of fracturing. The purpose of this work is to establish the features of the relationship between the spatio-temporal distribution of seismicity and the distribution of geoelectric inhomogeneities in the Earth’s crust (fault-block tectonics of the region). Based on the analysis of the results of the interpretation of magnetotelluric data (2D inversion) and new detailed seismotomographic constructions, the verification of geoelectric models was carried out, the analysis of the distribution of hypocenters of seismic events was carried out. Special attention was paid to the confinement of earthquakes to listric fault structures. The relationship between the distribution of the hypocenters of seismic events and the spatial position of the electrical conductivity anomalies is confirmed by the authors explanation of the physical nature of the identified conducting structures, based on hypotheses of fluidization and partial melt of the Earth’s crust.
Highlights
The paper presents the results of experiments carried out at the regime points of magnetotelluric monitoring both on the territory of the Bishkek geodynamic test site (Northern Tien Shan) and on a series of monitoring profiles in various geological conditions
This paper considers a comparison of the results of the main deep geophysical methods for studying the Earth's crust and the upper mantle - magnetotelluric sounding and seismic tomography, as well as the distribution of seismic events to identify blocks and layers of the Earth's crust with anomalous physical parameters, identifying zones of fracturing or decompaction of rocks, which may be associated with fluid-saturated areas
An example of the analysis of the comparison of the field distribution of the hypocenters of seismic events, the geoelectric model and the tectonic structure of the Central Tien Shan is shown in Figure 3 [11]
Summary
The paper presents the results of experiments carried out at the regime points of magnetotelluric monitoring both on the territory of the Bishkek geodynamic test site (Northern Tien Shan) and on a series of monitoring profiles in various geological conditions. Based on a comparison of the deep sections of the seismicity distribution field and the geoelectric structure of the zones of dynamic influence of fault structures, the author concluded that there is no compelling reason to connect the distribution of earthquake hypocenters to the near-surface fault zones for the study area.
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