GNSS data analysis and updated geodetic velocity field in Greece

Abstract

In this study an updated crustal velocity field for the Greece area was estimated using a time series analysis that covers a duration of 16 years from 227 Global Navigation Satellite System (GNSS) permanent stations. The GNSS processing was carried out using GNSS Analysis software at MIT (GAMIT) and the velocity field expressed with respect to Eurasian plate. For the time-series analysis, we applied a robust Median Interannual Difference Adjusted for Skewness (MIDAS) trend estimator to mitigate the effects of discontinuities due to geophysical phenomena on the estimation of geodetic velocities and their uncertainties. We also compare our geodetic velocities with five previous publications, where we found consistency at the mm/year level, leading to reliable results for the geodynamic behavior of the Greek area, providing a dense velocity field.