M4.3 earthquake 17 km ESE of Alpine, Wyoming
A magnitude 4.3 earthquake struck 17 km ESE of Alpine, Wyoming on Thu, Aug 22, 1985, 12:17 AM MDT (06:17 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M4.6 14 km SSE of Hoback, Wyoming. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 1985-08-22 06:17:39 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 43.125° N, 110.814° 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: 6 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.412 km ESE of Alpine, Wyoming · 15005 days ago · 5 km deep · 4 km away
- 3.212 km E of Alpine Northeast, Wyoming · 15005 days ago · 5 km deep · 7 km away
- 4.210 km ESE of Alpine Northeast, Wyoming · 14997 days ago · 5 km deep · 8 km away
- 3.66 km ESE of Alpine, Wyoming · 14991 days ago · 5 km deep · 10 km away
- 4.614 km SSE of Hoback, Wyoming · 14990 days ago · 5 km deep · 8 km away
- 3.59 km SE of Alpine, Wyoming · 14977 days ago · 8 km deep · 9 km away
Before
Earthquakes todayWyoming earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002j07. Read Tue, Sep 22, 2026, 5:08 AM UTC.