Seismotectonic reactivation of the marginal suture zones of the Siberian craton

A comprehensive seismotectonic study of the tectonic structures of the Siberian Platform and its folded framing was carried out in order to identify the regional regularities of the processes of destruction of the Earth’s Crust and the dynamics of the formation of focal zones of strong earthquakes. The data on the geological and geophysical structure, the newest structural plan, quantitative characteristics of the newest and modern tectonic movements were analyzed. According to the degree of activity and orientation of geodynamic processes, regional principles for the classification of neotectonic structures with the rationale for their differentiation into classes were developed. The most active segments of the Verkhoyansk marginal suture and the Baikal-Stanovoy fold system are considered, which have a dynamic impact on the style of tectonic deformations of adjacent areas of the Siberian Platform, where strategic mineral deposits of the Republic of Sakha (Yakutia) are located. It is established that the most active structures are located in zones of the dynamic influence of marginal sutures. They are contrasted against the gradient field of modern vertical tectonic movements, but they are characterized by the mosaic field of the medium and low rates of modern movements. The level of their seismic activation and the kinematic type of seismotectonic deformations are modeled by global geodynamic processes taking place at the boundaries between the Eurasian, North American and Amur lithospheric plates. The weak activated structures of the Siberian Platform, which are characterized by the highest rates of modern movements, are heterogenic genesis. The dynamics of the formation of these high-gradient deformation zones may have been influenced by glacial isostatic movements. In order to correctly assess the degree of geodynamic activity of modern structures, special consideration should be given to all the factors that control seismogeodynamic processes, including tectonic stress accumulation, and the intensity of seismic events.

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