The Velocities of Modern Horizontal Movements of Earth Crust in the South Sector of Yenisei Ridge According to GNSS Obse
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MOLOGY
The Velocities of Modern Horizontal Movements of Earth Crust in the South Sector of Yenisei Ridge According to GNSS Observations Academician A. D. Gvishiania,b, V. N. Tatarinova,b, V. I. Kaftana, A. I. Manevicha,c*,
B. A. Dzeboeva, and I. V. Loseva,c
Received April 30, 2020; revised May 3, 2020; accepted May 5, 2020
Abstract—The paper presents the results of GNSS observations, provided by the authors in 2010-2019 years, in the zone of contact of tectonic structures of the Siberian platform, West-Siberian plate and West-Sayan orogenic area. We presented the first time assessment of the velocities of modern horizontal movements and the structural-kinematic model of block movements in a southern sector of the Yenisei Ridge. This model enables to assess the geodynamic safety of disposal of high-level radioactive waste in granite gneisses rocks of the Nizhne-Kansk massif. Keywords: modern horizontal crustal movements, Siberian Platform, West Siberian Plate, Lower Kan massif, GNSS observations, radioactive waste DOI: 10.1134/S1028334X20070077
The southern part of the Yenisei Ridge is located at the junction of large regional tectonic structures, namely, the ancient Siberian Platform, the epi-Hercynian West Siberian Plate, and the West Sayan orogenic fold zone [1]. Within the boundaries of the Nizhne-Kansk granite–gneiss massif, which directly borders on the Atamanovskiy branch of the Yenisei Ridge, the building of an underground research laboratory (URL) for validating the safety of disposal of high-level radioactive waste (RAW) began in 2019 [2]. In 2010, researchers of the Mining and Chemical Combine at Zheleznogorsk and the Geophysical Center, Russian Academy of Sciences, organized a satellite geodetic network within the boundaries of the Nizhne-Kansk massif; this network included 30 GNSS stations intended for observations of modern crustal movements (MCMs) [3]. Seven observation cycles were carried out using this network, and the time series obtained for the period from 2010 to 2019 reflecting changes in the coordinates of GNSS stations were analyzed. To determine the displacement vectors and deformation rates, we used the methods and algorithms a Geophysical
Center, Russian Academy of Sciences, Moscow, 119296 Russia b Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, 123995 Russia c Mining Institute, National University of Science and Technology MISiS, Moscow, 125009 Russia *e-mail: [email protected]
described in [4, 5]. The basis for processing of the GNSS data and their interpretation were base-line vectors and their correlation matrices obtained from statistical processing and diagnostic equalizing of the measurements cycles conducted from 2010 to 2019. We obtained the time series of displacements for 23 geodetic stations. Table 1 provides the calculated displacement velocity for the GNSS stations presented in Fig. 1 (the velocities are calculated for the first time). The root mean square (RMS) errors in determination of their plan-view position for particular measureme
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