On the Accuracy of Determining the Velocities of Geodetic Points

G. E. Melnik, I. A. Oshchepkov

Transactions of IAA RAS, issue 69, 26–38 (2024)

DOI: 10.32876/ApplAstron.69.26-38

Keywords: geodesy, geodynamics, lithospheric plates, GNSS, coordinate systems, plate motion models

Abstract

The aim of this study is to investigate the accuracy of determining the velocities of geodetic points on the Earth's surface with tectonic processes being taken into account. This aspect is of particular importance as the constant displacements caused by tectonic activity can be determined either through repeated geodetic observations or through modeling tectonic plate motion. It is noted that each of these approaches has its advantages and disadvantages, but the main focus is on assessing the accuracy of velocity determination, as the motion parameters of points are crucial elements in modern coordinate systems. The research methodology is based on data obtained from continuously operating GNSS stations. These data provide a comprehensive picture of the motion of geodetic points and are essential for studying tectonic activity. The study includes the analysis and the comparison of velocities derived from time series of geocentric coordinates with velocities obtained from models of tectonic plate motion. As a result of this study, it has been found that although overall tectonic plate motion models yield similar results, each model has its own peculiar features. It has been observed that the largest errors are associated with plate boundary zones where significant deformations of the Earth's surface occur. These findings significantly contribute to understanding the processes occurring in the Earth's crust and the approaches for establishing and improving coordinate systems.

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