An earthquake of magnitude 6.9 struck the South Sandwich Islands region, the European-Mediterranean Seismological Centre (EMSC) said on Monday. The quake was at a depth of 10 km (6 miles), EMSC said. The quake occurred in the middle of the south Atlantic ocean, 2,960 km (1,839 miles) east-north-east of Punta Arenas, Chile, EMSC added. There was no immediate tsunami threat after the quake, according to the U.S. Tsunami Warning System.