The temblor occurred 46 km (28 miles) west of Illapel, Chile, and 229 km (142 miles) northwest of Santiago, Chile's capital. It occurred as the result of thrust faulting on the interface between the Nazca and South America plates in central Chile, the USGS said.
At least 13 people were killed as a result of the quake, according to the Chilean government. One million Chileans were evacuated due to tsunami warnings. The tsunami warnings in the immediate area have been canceled.