The Impact of the Baltic Sea Non-tidal Loading on GNSS Station Coordinate Time Series: the Case of Latvia

Abstract

The objective of this study is to discover the geodynamic processes of the Earth's crust in the territory of Latvia occurred due to the effect of the Baltic Sea non-tidal loading, by way of using GNSS permanent station daily coordinate time series and tide gauge data to find correlations between two data sets for the period from 2012 up to 2018. For this study observations of 31 Latvian and 2 Estonian GNSS stations were used. Stations belong to the LatPos, EUPOS ®-Riga, EPN and EstPos networks. Station daily coordinate time series were computed using Bernese GNSS software v5.2 in a double-difference mode with 9 fiducial stations from International GNSS Service and EUREF Permanent GNSS Network. The analysis of obtained data significantly increases understanding of the Earth's surface displacements occurring due to the loading effect in Latvia.