No reports of damage after magnitude 6.4 earthquake strikes northern Argentina
A 6.4-magnitude earthquake struck northern Argentina in the early hours of Monday morning, the US Geological Survey said.
The tremor hit at 2:07am local time 21 miles east-southeast of Suncho Corral in Santiago del Estero province.
There were no immediate reports of casualties or damage.
Suncho Corral lies about 630 miles northwest of the capital Buenos Aires.