M3.4 earthquake 12 km ESE of Alpine, Wyoming
A magnitude 3.4 earthquake struck 12 km ESE of Alpine, Wyoming on Thu, Aug 22, 1985, 2:44 PM MDT (20:44 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M4.2 10 km ESE of Alpine Northeast, Wyoming. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.4 (ml), minor
- Local time
- UTC
- 1985-08-22 20:44:12 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 43.129° N, 110.868° W
- Region
- Wyoming
- 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.
- Depth from
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 5 in the 60 days after this one and 2 in the 30 days before it.
After
- 3.212 km E of Alpine Northeast, Wyoming · 15005 days ago · 5 km deep · 6 km away
- 4.210 km ESE of Alpine Northeast, Wyoming · 14997 days ago · 5 km deep · 4 km away
- 3.66 km ESE of Alpine, Wyoming · 14990 days ago · 5 km deep · 6 km away
- 4.614 km SSE of Hoback, Wyoming · 14990 days ago · 5 km deep · 12 km away
- 3.59 km SE of Alpine, Wyoming · 14977 days ago · 8 km deep · 5 km away
Before
Earthquakes todayWyoming earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002j14. Read Tue, Sep 22, 2026, 4:02 AM UTC.