FACTORS FOR THE OCCURRENCE OF SMALL-FOCUS EARTHQUAKES IN THE MIDDLE AND LOWER KURA DEPRESSIONS
Journal Title: Scientific Work - Year 2023, Vol 17, Issue 2
Abstract
The hypocenters of the earthquakes that occurred in the Kura depression are confined to the zones of its junction with the surrounding mountain structures of the Lesser Caucasus and the Greater Caucasus, where tectonic faults with complex properties are developed. At the same time, a significant part of earthquakes occur in zones where there are no breaks in the Earth's crust, and these events are not accompanied by ripping of the earth's surface. According to the results of the structural interpretation of seismic data, it has been shown that there are no tectonic faults in the inner areas of the Kura depression, which are involved in the process of releasing elastic energy (stress) created as a result of the convergence of the Eurasian and Arabian lithospheric plates. It is shown that almost half of the total number of small focus earthquakes within the territory under consideration arise as a result of multidirectional spatial movement of blocks of a heterogeneous base (foundation) without provoking ruptures in the upper plastic geological medium and the Earth's surface. In some zones, such earthquakes also occur in the inner part of the Mesozoic stage of the geological section, which is also characterized by a heterogeneous structure. It is shown that some of the earthquake sources in the territory under consideration are formed as a result of thrusting of one mass onto another along planes that have a subhorizontal direction. Such processes occur in the Cenozoic interval of the earth's crust. It is shown that most of the discovered deposits in the territory covered by this study are associated with reservoirs created by paleo-river arteries and have no connection with tectonic faults. Thus, assumptions about the formation of hydrocarbon deposits with the participation of tectonic faults are not confirmed by the results of interpretation of seismic data. The studies were carried out with a joint integrated analysis of seismic data carried out in the period from 1993 to 2019 and seismological observations since 2003 to 2019.
Authors and Affiliations
Namaz Puti Yusubov
Keywords
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- EP ID EP755531
- DOI 10.36719/2663-4619/87/34-45
- Views 2
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