M7.7 earthquake 123 km W of Río Grande, Argentina
A magnitude 7.7 earthquake struck 123 km W of Río Grande, Argentina on Sat, Dec 17, 1949, 3:53 AM GMT-3 (06:53 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 7.7 (mw), major
- Local time
- UTC
- 1949-12-17 06:53:32 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 53.972° S, 69.562° W
- Region
- Argentina
- Strongest shaking
- VIII, severe shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- VIII, severe shaking
- Peak ground acceleration
- 31.4% of gravity
- Peak ground velocity
- 3.9 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Magnitude uncertainty
- ±0.25
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 1 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 iscgem897093. Read Tue, Sep 22, 2026, 10:24 AM UTC.