GPS data were processed using GIPSY-OASIS 6.4 software, with orbits and clock estimated provided by the NASA Jet Propulsion Laboratory. Daily solutions were calculated using the precise point positioning method (33). Phase ambiguity resolution was performed (34), and ocean loading was removed using FES2004 (35). Tropospheric delay was estimated using the VMF1 (Vienna mapping function 1) mapping function (36), and ionospheric delay was estimated using the Ionex model (37). Stations were processed in the IGb08 reference frame.

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