GEOPHYSICAL RESEARCH, 2018, vol. 19, no. 4, pp. 64-79. https://doi.org/10.21455/gr2018.4-5

UDC 550.242.1

Abstract  References   Full text (in Russian)

MODERN GEODYNAMICS OF THE SOUTHERN OF THE YENISEI RIDGE DERIVED FROM THE RESULTS OF SATELLITE OBSERVATIONS

V.N. Tatarinov(1,2), V.N. Morozov(1), A.I. Kaftan(1), A.I. Manevich(1)

(1) Geophysical Center of RAS, Moscow, Russia

(2) Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow, Russia

Abstract. The modern movement of the Earth's crust is studied for the northern part of the Nizhne-Kansky massif (Krasnoyarsk region), where it is planned to build an underground depository for radioactive waste in geological formations. The results are presented. The surveys based on GPS/GLONASS systems were conducted in 2010–2016 and allowed us to obtain new knowledge about the modern geodynamic regime of the region located in the contact zone of the largest tectonic structures of the Siberian Platform, the West Siberian Plate, and the Altai-Sayan orogen. The cyclic nature of modern geodynamic motions has been experimentally proved. A sharp activation of the tectonic regime was revealed in 2013–2014 that manifested itself in a change in the sign of compression and tension strains on the right and left banks of the Yenisei River in the contact zone of the Siberian platform and the West Siberian plate.

Maximum movement velocities were fixed at points located in the zone of dynamic influence of the Muratov and Pravoberezhnyi faults. Due to the cyclic effect, the absolute velocity values decrease with increasing the time of observations. Over the six-year observation period, they very rarely exceeded the value of ±5 mm/year. Comparing the values of strain rates with the criteria published for identifying hazardous faults, it can be argued that the area is rather geodynamically stable, the maximum strain rates there do not exceed 5×10–7 year-1.

Keywords: modern crustal movements, satellite systems GPS/GLONASS, monitoring, radioactive waste.

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