The U.S. Geological Survey says a preliminary magnitude 7.1 earthquake has hit off the coast of South America near Antarctica.
The center of the activity was 48 km north of Bristol Island, South Sandwich Islands. There are active volcanoes on Bristol Island — the last recorded eruption was in 2016.
The event was first described by the agency as a 7.5.
Prelim M7.1 Earthquake South Sandwich Islands region Dec-11 02:26 UTC, updates https://t.co/iB8VYKMxq9
— USGS Big Quakes (@USGSBigQuakes) December 11, 2018
The US Tsunami Warning Center did not indicate a tsunami threat: “Based on all available data, there is no tsunami threat from this earthquake.”