M4.0 earthquake 18 km SW of San Antonio, Chile

A magnitude 4.0 earthquake struck 18 km SW of San Antonio, Chile on Sun, Oct 16, 2016, 9:35 PM GMT-3 (00:35 UTC), 34 km (21 mi) below the surface.

A larger quake followed: M6.0 88 km WSW of San Antonio, Chile. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

The USGS’s account of the effects of this earthquake.

Felt (IV) at Curacavi; (III) at Cartagena, Melipilla, San Antonio and Santo Domingo; (II) at Santiago.

From the USGS event page for us20007enn. U.S. Geological Survey text and figures are in the public domain.

2 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 2 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us20007enn. Read Fri, Oct 2, 2026, 9:41 AM UTC.