The aftershocks were recorded at 10.52 UTC, 85 kilometres from the city of San Antonio. The centre of the earthquake lay at a depth of 10 kilometres.
No casualties have been reported so far.
According to USGS, the epicentre was located 115 km south-west of the city of Valparaiso with a population of about 282,000.
Authorities have not warned of a tsunami threat.