A 7.4 magnitude earthquake struck off the southern coasts of Chile and Argentina on Friday, the United States Geological Survey said.

A 7.4 magnitude earthquake strikes off the southern coasts of Chile and Argentina, the United States Geological Survey says.

A major, 7.4-magnitude earthquake struck in the South Atlantic Ocean on Friday, prompting an alert for a potential tsunami along parts of the Chilean coast, according to monitoring agencies in the United States.