M4.0 earthquake 82 km SW of San Antonio, Chile

A magnitude 4.0 earthquake struck 82 km SW of San Antonio, Chile on Fri, Apr 23, 2021, 12:13 AM GMT-4 (04:13 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.1 57 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.

1 person reported to the USGS what they felt; the strongest reported shaking was I, not felt shaking.

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 17 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us6000e3v3. Read Sat, Oct 3, 2026, 8:11 AM UTC.