Methods and results of determination of movements and deformations of the Earth’s crust according to GNSS data at the Nizhne-Kansk geodynamic test network in the area of radioactive waste disposal [Методика и результаты определения движений и деформаций земной коры по данным ГНСС на Нижне-Канском геодинамическом полигоне в районе захоронения радиоактивных отходов]

The methods and results of determining the current movements and deformations of the Earth’s crust by means of global navigation satellite systems (GNSS) at a geodynamic test site in the area of deep burial of radioactive waste in Krasnoyarskiy Kray are considered. Approaches to observations and data processing are aimed at obtaining the most accurate results of deformation monitoring. The method of repeated observations ensures the weakening of one-directional measurement errors of a seasonal and local nature due to the organization of work at one and the same time of the year, and using at each point the same set of measuring equipment in all repetitions. Techniques to improve the objectivity of the interpretation of results are applied. The measurement processing technique is an adjustment of the differences of the time-varying increments of the coordinates of the baseline vectors with regard to their covariance matrices. The result of processing is the vectors of spatial displacements and horizontal deformations of the triangles of the control observation network. To determine the deformations, the triangles of Delaunay triangulation are selected. To eliminate the effect of triangles unequality, they are scaled by assigning them to the average area of the triangle. New results of the determination of deformations accumulated in the region of the Nizhnekanskiy Massif from 2012 to 2016 are described. The magnitude of the deformations of the order of 10 –5 indicate a high mobility of tectonic faults of the studied territory. © 2019 Space Research Institute of the Russian Academy of Sciences. All rights reserved.