Moreira D. M. auteur aut IRD Calmant Stéphane auteur aut IRD Perosanz F. auteur aut IRD Xavier L. auteur aut IRD Rotunno O. C. auteur aut IRD Seyler Frédérique auteur aut IRD Monteiro A. C. auteur aut IRD text journalArticle eng text/pdf born digital access In large hydrological basins, water mass loading can produce significant crustal deformation. We compare the monthly vertical component of 18 GPS sites located in the Amazon basin, with the deflection models derived from Gravity Recovery and Climate Experiment (GRACE) observations on the one hand and derived from HYDL, a global hydrological model, on the other hand. The GPS data set includes the largest deflections by hydrological loading ever recorded at two stations located in the center of the basin. The main result of the study is that the GRACE solution produced by GRGS (Groupe de Recherche en Geodesie Spatiale, Toulouse, France) produces the best agreement with the Global Navigation Satellite Systems series with a correlation coefficient up to 0.9 in the center of the basin, although 70% at best of the RMS variation in the GPS series is accounted for. specialized BRESIL AMAZONIE 062 126 020 43 18 9604-9610 2016 0094-8276 https://www.documentation.ird.fr/hor/fdi:010068241 10.1002/2016gl070265 0094-8276 [F B010068241] https://www.documentation.ird.fr/hor/fdi:010068241 https://www.documentation.ird.fr/intranet/publi/2016/11/010068241.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-12-06 2021-04-07 fdi:010068241 fre