Calmant Stéphane auteur aut IRD Pelletier Bernard auteur aut IRD Pillet Robert auteur aut IRD Régnier Marc auteur aut IRD Lebellegard Pierre auteur aut IRD Maillard D. auteur aut IRD Taylor F. auteur aut IRD Bevis M. auteur aut IRD Recy Jacques auteur aut IRD text journalArticle eng text/pdf reformatted digital access On July 13, 1994, an earthquake Ms = 7.3 occurred at Malekula, in the New Hebrides archipelago. The GPS data collected across the New Hebrides trench between 1990 and 1996 were processed in order to separate the interseismic and coseismic motions from the drifts related to the convergence with the Australian plate. The GPS-derived coseismic displacements at the GPS site in Malekula are 49 = 15 mm southward, 230 = 30 mm westward and 170 = 37 mm downward, when the CMT-derived displacements are 50 mm southward, 210 mm westward and 150 mm downward. Taking into account the interseismic strain accumulation (25 mm/yr at the source established from historical seismicity, 7.5 mm/yr at the GPS site), the strain-free convergence rate at Malekula is 49 = 3 mm/yr. Other GPS-derived convergence rates are 95 = 1 mm/yr at Efate and 37 = 2 mm/yr at Santo. These rates imply a regional right-lateral motion between the Efate and the Santo-Malekula segments. In contrast, the focal mechanism of the earthquake mostly indicates a lift-lateral motion. Therefore, we hypothesize that the earthquake is related to variations in the interplate coupling along the converging boundary of the Santo-Malekula segment. (Résumé d'auteur) specialized SEISME SUBDUCTION MARGE CONTINENTALE COMPRESSION TECTONIQUE CONTRAINTE EPICENTRE GPS VANUATU MALEKULA 066SISMO 24 23 3077-3080 1997 0094-8534 https://www.documentation.ird.fr/hor/fdi:010019281 10.1029/97GL02962 0094-8534 [F B010019281] https://www.documentation.ird.fr/hor/fdi:010019281 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_51-52/010019281.pdf IRD - Base Horizon / Pleins textes 1999-10-11 2018-06-15 fdi:010019281 fre