Data provided by coral growth for sismotectonic studies in Futuna (French Overseas Territory of Wallis and Futuna, southwest Pacific)

The morphology and growth analysis of coral microatolls using X-rays indica tes that after a subsidence of 3 cm from 1977 to 1993, an uplift of 5 cm oc curred in 1993 in the southeast of Futuna (southwest Pacific). These vertic al motions are related to the strain accumulation followed by their relaxat ion during the earthquake (Mw: 6.4) on 12 March 1993 The locations publishe d by the global network are nor in agreement with the aftershocks recorded locally and the co-seismic uplifts observed on the reefs. The latter indica te instead that the rupture area is located below the southwest of Futuna a t an average depth of 8 km. ((C) 1999 Academie des sciences / Editions scie ntifiques et medicales Elsevier SAS.).