M4.6 earthquake Chile-Argentina border region
A magnitude 4.6 earthquake struck in the Chile-Argentina border region on Tue, Oct 26, 2021, 12:35 AM GMT-3 (03:35 UTC), 91 km (56 mi) below the surface.
A larger quake followed: M5.7 Chile-Argentina border region. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (Mwr, regional moment), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-10-26 03:35:42 UTC
- Depth
- 90.6 km (56.3 mi), intermediate-depth
- Epicenter
- 32.807° S, 70.686° W
- Region
- Argentina
- Felt reports
- 67
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
67 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
- Strike-slip
- Moment magnitude
- 4.6 Mwr
- Nodal plane 1
- Strike 154°, dip 32°, rake 174°
- Nodal plane 2
- Strike 249°, dip 87°, rake 58°
How well it is located
Reviewed by a seismologist.
- Location uncertainty
- About 3.3 km horizontally, 3.2 km in depth
- Magnitude uncertainty
- ±0.05
- Depth from
- From location
- Station coverage gap
- 62°
- Stations used
- 98
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 3 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayArgentina earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000fxix. Read Sun, Oct 4, 2026, 6:53 PM UTC.