GEOPHYSICAL RESEARCH, 2020, vol. 21, no. 1, pp. 24-32. https://doi.org/10.21455/gr2020.1-2
UDC 528.2; 550.34
Abstract References Full text (in Russian) Full text (in Englih)
SATELLITE MONITORING AND SEISMIC ACTIVITY OF THE NORTH-WEST OF RUSSIA
T.V. Guseva, I.S. Krupennikova, A.N. Mokrova, V.P. Perederin, N.K. Rozenberg
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Abstract. Results of GNSS observations (global navigation satellite system GPS/GLONASS) in 2006–2018 in the study the modern intraplate geodynamics of North-West of Russian Federation are analyzed.
In the study of modern movements and deformations of the earth's crust, the data of repeated satellite measurements carried out by the staff of the IFZ RAS in Karelia, Leningrad region, as well as measurements from 20 permanent stations of the International geodynamic network were used. In addition, the data obtained at the new geodynamic polygon located in the Kandalaksha Bay area, where several cycles of repeated measurements have been carried out since its foundation in 2015, are considered.
Repeated GNSS measurements confirmed that dome-shaped lifting, confined to the Baltic shield, continues with a velocity 10.4 mm/year. Within the Russian part of the territory the rate of uplifting reaches 6 mm/year. Horizontal displacements of GNSS stations in the ITRF have a North-East direction and average velocities (according to approximated data for 2006–2018) from 19.9 mm/year in the north to 23.9 mm/year in the south. The deformation field of the region is non-homogeneous, the extended compression and stretching zones replace each other, with values from (–0.8)×10–8 to 1.6×10–8.
According to the earthquake catalogue for the period 2000–2018, the seismic energy flux (PE) released as a result of local tectonic earthquakes was calculated. The distribution of velocities of seismic energy flux within the considered area is rather heterogeneous. In the western part, there is a region of meridional orientation, characterized by seismic activity up to 1010 J/year, confined to the extension zone with deformations up to 0.6×10–8 per year. In the Ladoga-Onega region, the seismic activity zone with PE about 106 J/year is extended from the South-West to the North-East and confined to the transition area of compression and extension.
The comparison of the displacements velocities, deformations and seismicity determines the quantitative characteristics of the modern geodynamics of the studied region.
Keywords: GNSS, satellite measurements, seismicity, movements, deformations, monitoring, Baltic shield, seismic energy flux.
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