A Reuters witness reported shaking buildings and loss of electricity in Santiago, which is north of the epicenter.

The earthquake struck 56 miles (90 km) northeast of Concepcion at a depth of 34 miles (55 km) at 3:34 a.m./1:34 EST/0643 GMT. The quake was initially reported at a magnitude of 8.3.

The Reuters witness reported a very strong shaking lasted for 10 to 30 seconds.