INFLUENCES ON VERTICAL SHALLOW CRUST DEFORMATIONS IN THE CARPATHIAN-DANUBIAN-PONTIC AREA, AN EARTH SCIENCE INTEGRATED THEMATIC SERVICE CASE STUDY

We describe a comprehensive analysis of permanent Romanian Global Navigation Satellite System (GNSS) sites' on vertical position time series from data spanning 3-20 years. The GPS observations were computed using Gipsy X software, we apply Global Positioning System (GPS) Imaging, a new technique for robust estimation of the vertical velocity field of the Earth's surface, and the final estimates to obtain the stations' vertical deformations velocities were analyzed using Maximum Likelihood Estimation (MLE) and Median Interannual Difference Adjusted for Skewness (MIDAS) trend estimator which is insensitive to undocumented steps, outliers, seasonality, and heteroscedasticity. We focus on the known national GPS observation level model in the Carpathian-Danubian-Pontic area to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates at 45 degrees latitudes. Finally, we interpolate the data using weighted median estimation on a grid. The resulting velocity field is temporally and spatially robust, and edges in the field remain sharp. Our investigation results into a case study and an integrated thematic service of influences that could be applied to the revised analysis strategies of vertical deformations over the Romanian region.