A magnitude 5.6 earthquake occurred at 06:55:30 UTC (02:55:30 local time) on 28 December 2015, at 26 km (16 mi) SW of Saint-Pierre, Martinique 32 km (20mi) W of Fort-de-France, Martinique, 82 km (51 mi) S of Roseau, Dominica and 78 km (46 mi) NNW of Castries, Saint Lucia. Initial estimates from the United States Geological Survey (USGS) located the epicentre of the event at 14.593ºN, 61.371ºW, and at a depth of 152.9 km.