Ph.D. Theses

Seismogeodynamics of Talysh structural zone

Ismailova Saida Siraj gizi

2507.01 - Geophysics, geophysical methods of reconnaissance of the minerals

One of the actual problems of studying the seismogeodynamics of the Talysh seismogenic zone is the identification of regularity spatio-temporal relationship seismically of active zones, which is carry information about the seismic process. In recent years, at the present stage the dense of highsensitivity digital seismic stations network in the amount of 35, allowing to register all seismic events with a magnitude M> 0.1 within the Talysh region, allowed to obtain new data on the mechanism of earthquake foci, which allowed more detailed study of the regularities of the modern deformation process in the lithosphere of Azerbaijan. The main purpose of dissertation work is the study of seismotectonic deformations of the Talysh seismogenic zone on the basis of modern approaches to seismological material processing analysis.

In the dissertation work on the basis of the method of calculating the tensor of the seismic moment of strong earthquakes in the studied region for the period 2003-2016. according to modern digital stations, a statistical analysis of the obtained solutions of the mechanisms of earthquake foci and the main types of tectonic shifts in seismogenic zones have been established. It is established, that most of the study area is subject to compression, shifts are noted in the area of Lerik and Yardimli. For the Talysh region, there are three main types of progress: reverse faults-thrusts (more than 50%), strikeslip and normal faults.

Analysis of the axes of compression of stronger earthquakes showed the predominance of the northeastern orientation, and the weaker SW-SW orientation. The predominant direction for the azimuths of the axes of compression of focal mechanisms is the north-north-east direction, and for the extension axes - east-south-east and also south-west.

The urgency of studying the stress-strain state of the earth crust is necessary for solving practical problems such as seismic hazard assessment of industrial and civil structures, development and operation of large deposits of minerals such as oil and gas.

In addition, a new approach to the construction of three-dimensional velocity models of the earth crust and the vp/vs ratio for a given territory is applied, which is relevant for seismological and tectonic studies. The new information obtained on the basis of the analysis of the newly calculated velocity models together with the new refined tectonic maps, largely supplements existing ideas about the features of the geological structure and the dynamic processes taking place in this region.