A strong aftershock 6.2 in magnitude struck offshore northern Chile early on Monday, the U.S. Geological Survey said, following a 6.7 magnitude earthquake nearby on Sunday that caused only minor damage but led to brief evacuations along the coast.
The aftershock struck 76 kilometres west-northwest of Iquique at 2:11 a.m. local time at a relatively shallow depth of 11 kilometres, USGS said.
There were no immediate reports of damage or injuries.
Following the earlier quake, Chile's massive copper mines, clustered in the mineral-rich North, appeared to be fine. Collahuasi, a partnership between Glencore Xstrata and Anglo American, located in the area, said operations were normal.
The Pacific Tsunami Warning Centre said following the earlier quake that there was no tsunami expected.
Chile is one of the world's most earthquake-prone countries. A magnitude-8.8 quake and the tsunami it unleashed in 2010 killed more than 500 people, destroyed 220,000 homes, and washed away docks, riverfronts and seaside resorts.
The strongest earthquake ever recorded also happened in Chile, a magnitude-9.5 tremor in 1960 that killed more than 5,000 people.