A strong 6.3-magnitude earthquake struck offshore northern Chile Tuesday, the US Geological Survey said, just a week after the region was rocked by a major 7.7-magnitude earthquake which killed two, injured 15,000 and damaged an estimated 4,000 structures.

The quake struck at 2:55 pm (1755 GMT) and was centered offshore 93 kilometers (58 miles) north of Antofagasta, Chile, in the same area as last Wednesday's quake and several powerful aftershocks in subsequent days, according to the USGS.