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New constraints on Antarctic plate motion and deformation from GPS data / Marie-Noëlle Bouin in Journal of geophysical research : Solid Earth, vol 105 n° B12 ([10/12/2000])  

Public [article]  inJournal of geophysical research : Solid Earth > vol 105 n° B12 [10/12/2000] . - 17 p. Titre : New constraints on Antarctic plate motion and deformation from GPS data Type de document : Article/Communication Auteurs : Marie-Noëlle Bouin , Auteur ; Christophe Vigny, Auteur Année de publication : 2000 Article en page(s) : 17 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] Antarctique [Termes IGN] déformation de la croute terrestre [Termes IGN] données GPS [Termes IGN] séisme [Termes IGN] station GPS [Termes IGN] système de référence géodésique [Termes IGN] tectonique des plaques Résumé : (Auteur) Four years (1995~1998) of continuous Global Positioning System (GPS) data recorded by 11 permanent International GPS Service (IGS) stations in Antarctica and surrounding regions have been processed using an optimized method for regional geodetic networks. The 4year time series has allowed us to extract nonlinear variations and constant horizontal velocities for all the stations. In December 1997 we have set up a permanent GPS station at Dumont d'Urville in Terre Adélie The resulting data, along with those of the Scientific Committee on Antarctic Research (SCAR) campaigns (1995 and 1996) are included in our processing. A co-seismic displacement (1 to 2 cm) is detected in the horizontal components of this station. We relate this to the March 25, 1998, Mw=8.1 Balleny Islands earthquake for which a dislocation model yields prediction in the right direction. For the six Antarctic stations the horizontal rates are very consistent with the rigid plate rotation, all the residual velocities are negligible (less than 2 mm/yr), except at O'Higgins in the head of the peninsula (7 mm/yr toward the continent). The position of the rotation pole (62.0'N, 146.7°W) and its rate (0.264°/Ma) are significantly different from the NNRNuvel1A predictions for the Antarctic tectonic plate but are consistent with the Australian relative motion. The high horizontal residual in the peninsula area, where iceberg calving rates and ice shelf disintegration have recently increased, can be interpreted as the horizontal component of the elastic crustal response to the load variations. Numéro de notice : A2000-270 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2000JB900285 Date de publication en ligne : 10/12/2000 En ligne : https://doi.org/10.1029/2000JB900285 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34435 [article]