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Abstract
The accuracy of GPS data analysis for the vertical component has reached a level where the vertical crustal deformation due to the ocean tidal loading should be taken into consideration. Ocean loading affects in particular the results of the GPS analysis for those observation sets covering less than 24 hours. Especially in these cases, a correction for this phenomenon should be performed during the data analysis. On the other hand, it is possible to estimate the ocean loading effect from GPS data sets. In this way it is possible to validate models for the loading deformation derived from global ocean tide models.