A magnitude 5.7 earthquake occurred at 10:57:00 UTC (04:57:00 local time) on 31 December 2015, at 68 km (42 mi) S of Masachapa, Nicaragua, 77 km (48 mi) SSW of San Rafael del Sur, Nicaragua, 87 km (54 mi) SSW of Diriamba, Nicaragua, 88 km (55 mi) SSW of Jinotepec, Nicaragua and 114 km (71 mi) SSW of Managua, Nicaragua. Initial estimates from the United States Geological Survey (USGS) located the epicentre of the event at 11.175ºN, 86.637ºW, and at a depth of 36.5 km (22.7 mi).