M5.6 earthquake 172 km W of Altai, Mongolia
A magnitude 5.6 earthquake struck 172 km W of Altai, Mongolia on Thu, Oct 20, 1949, 8:21 AM GMT+6 (02:21 UTC), 35 km (22 mi) below the surface.
A larger quake followed: M5.9 203 km W of Altai, Mongolia. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.6 (mw), moderate
- Local time
- UTC
- 1949-10-20 02:21:31 UTC
- Depth
- 35.0 km (21.7 mi), shallow
- Epicenter
- 46.376° N, 94.012° E
- Region
- Mongolia
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
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
- ±0.20
- 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 todayMongolia earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem896941. Read Wed, Sep 23, 2026, 4:31 AM UTC.