Chile earthquakes

M5.1 earthquake 81 km WSW of San Antonio, Chile

A magnitude 5.1 earthquake struck 81 km WSW of San Antonio, Chile on Mon, Apr 19, 2021, 7:13 AM GMT-4 (11:13 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.5 82 km WSW of San Antonio, Chile. This one was a foreshock.

San Antonio forecast More in Chile

Map

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

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The earthquake

Magnitude: 5.1 (Mww, W-phase moment), moderate
Magnitude from: USGS National Earthquake Information Center
Local time: Mon, Apr 19, 2021, 7:13 AM GMT-4
UTC: 2021-04-19 11:13:28 UTC
Depth: 10.0 km (6.2 mi), shallow
Epicenter: 33.971° S, 72.366° W
Region: Chile
Felt reports: 17
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
5.1	Mww, W-phase moment	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.071 · 19 stations
5.2	Mw, moment	ISC-GEM global catalog	Final · ±0.1
5.0	Mwr, regional moment	USGS National Earthquake Information Center	Moment tensor · Reviewed
4.9	Mww, W-phase moment	USGS, automatic first solution	First automatic solution · Preliminary

Did you feel it?

17 people reported to the USGS what they felt; the strongest reported shaking was VI, strong shaking.

Fault motion and ground failure

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

Faulting: Oblique reverse
Moment magnitude: 5.1 Mww
Nodal plane 1: Strike 26°, dip 23°, rake 125°
Nodal plane 2: Strike 169°, dip 71°, rake 76°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 4.0 km horizontally, 1.7 km in depth
Magnitude uncertainty: ±0.07
Depth from: Operator assigned
Station coverage gap: 51°
Stations used: 99

Nearest places

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

Nearby

Within 100 km, magnitude 2.1 and up: 25 in the 60 days after this one and 2 in the 30 days before it.

After

Before

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us6000e2uw (also filed as usauto6000e2uw, iscgem620344949). Read Sun, Oct 4, 2026, 9:01 AM UTC.