A powerful earthquake struck in northwestern Argentina near the border with central Chile late Monday, shaking people in parts of both countries. There were no early reports of injuries as some power outages were reported in the quake area.
The U.S. Geological Survey said the tremor had a preliminary magnitude of 6.4. Its epicenter was 27.6 kilometers (17 miles) southwest of the town of Porcito and struck at a depth of 14 kilometers (nearly nine miles).
The quake was followed a magnitude 5.0 aftershock about a quarter hour later, the USGS said.