Stability of Northern Eurasia Based on Satellite Geodesy Data

G. Melnik, G. Steblov
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Abstract

The geodynamics of Northern Eurasia has been analyzed based on repeated satellite positioning with GNSS stations throughout the Russian Federation territory from 2015 to the present. The study utilized two sources of data: observations from the stations of the Russian Fundamental Astro-Geodetic Network (FAGN) and stations of the International GNSS Service (IGS) with permanent satellite tracking. This data set allowed to estimate correctness of the block kinematics of the Eurasian plate in three tectonic plate motion models: NUVEL-1A, NNR-MORVEL-56, and ITRF2014. The analysis of the misfits between the observed and model velocities has shown that these misfits have a systematic component in the vicinity of the East European Platform which differs for each of three models. In addition to analyzing the block kinematics of the Eurasian plate, we also evaluated its internal stability. To do this, we calculated the areal deformations of Northern Eurasia using the finite element method. For this purpose, we added the observations processing results from the global data set of the Nevada Geodetic Laboratory to the processing results from two original data sets. Besides interplate boundary deformations which are consistent with existing ideas of the geodynamics of Northern Eurasia, the strain field analysis also revealed intraplate deformations distributed consistently with the configuration of the Northern Eurasia cratons.
基于卫星大地测量数据的欧亚大陆北部的稳定性
根据2015年至今在俄罗斯联邦全境的全球导航卫星系统台站进行的反复卫星定位,对欧亚大陆北部的地球动力学进行了分析。该研究利用了两个数据来源:俄罗斯基础天文大地测量网络(FAGN)台站的观测数据和国际全球导航卫星系统服务(IGS)台站的永久卫星跟踪数据。通过这组数据,可以估算出三个构造板块运动模型中欧亚板块运动学的正确性:NUVEL-1A、NNR-MORVEL-56 和 ITRF2014。对观测速度和模型速度之间的误差分析表明,这些误差在东欧地台附近有一个系统成分,三个模型中的每一个都不同。除了分析欧亚板块的块体运动学之外,我们还评估了其内部稳定性。为此,我们使用有限元方法计算了欧亚大陆北部的变形量。为此,我们将内华达大地测量实验室全球数据集的观测处理结果添加到两个原始数据集的处理结果中。除了板块间边界变形与现有的欧亚大陆北部地球动力学观点相一致外,应变场分析还揭示了板块内变形的分布与欧亚大陆北部板块的构造相一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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