Validating crustal velocities derived from the IDS contribution to ITRF201
Abstract:In the context of the ITRF2014, the IDS Combination Center delivered 1140 weekly SINEX files to the IERS containing DORIS station positions and Earth orientation parameters from January 1993 to December 2014 (series IDS 09). For each DORIS station, we computed the mean position and velocity by stacking the IDS 09 weekly solutions and combining them with both DORIS internal local ties (3-D vector between two successive beacon installations at the same DORIS site) from IGN and a discontinuity file.
The first objective of this study is to compare DORIS horizontal velocities to estimations from tectonic models such as GEODVEL and NNR-MORVEL56. The second purpose is to evaluate DORIS vertical velocities with respect to Global Isostatic Adjustment models (for Greenland, Fennoscandia, Iceland and Antarctica sites) such as ICE-6G_C, and with respect to the latests GPS solution at the University of La Rochelle. Sites showing large differences in either horizontal (ex: Arequipa, Dionysos/Gavdos, Goldstone, Manila and Santiago) or vertical velocities (ex: Rothera, Thule and Yellowknife) will be of special concern.