Updated

A magnitude-6.2 earthquake shook Chile's northern Pacific shore just hours after a stronger quake hit the same region and prompted a preventive evacuation of coastal areas due to fear of a possible tsunami.

The quake at 11:11 p.m. Sunday (0511 GMT Monday) was the strongest of more than 50 aftershocks that followed a magnitude-6.7 quake Sunday afternoon, according to the U.S. Geological Survey.

Most have been imperceptible but a few have shaken residents of the northern Chilean towns, leading some to sleep in their cars or outdoors.

The big quake caused only minor reported damage, though officials briefly evacuated more than 100,000 people from coastal zones.

Chile's Emergency Office called for a return to normalcy and said offices and schools would be open on Monday.

"We're a seismic country and we have to return to our daily lives, we have to continue working," said the agency's national director, Ricardo Toro.

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.