M2.0 earthquake 41 km SSE of Mammoth, Wyoming
A magnitude 2.0 earthquake struck 41 km SSE of Mammoth, Wyoming on Fri, Apr 12, 1985, 4:28 AM MST (11:28 UTC), 2 km (1 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.0 (md), micro
- Local time
- UTC
- 1985-04-12 11:28:44 UTC
- Depth
- 1.9 km (1.2 mi), shallow
- Epicenter
- 44.645° N, 110.449° W
- Region
- Montana
- 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.
- Location uncertainty
- About 0.6 km horizontally, 3.8 km in depth
- Depth from
- From location
- Station coverage gap
- 66°
- Stations used
- 17
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 1 in the 30 days before it.
After
- 1.821 km SSW of Mammoth, Wyoming · 15125 days ago · 12 km deep · 33 km away
- 1.9Idaho-Montana border region · 15121 days ago · 12 km deep · 61 km away
- 1.62 km NNW of Hebgen Lake Estates, Montana · 15113 days ago · 13 km deep · 61 km away
- 1.614 km E of Hebgen Lake Estates, Montana · 15105 days ago · 10 km deep · 47 km away
- 1.550 km SSE of Mammoth, Wyoming · 15089 days ago · 2 km deep · 9 km away
- 1.66 km NE of West Yellowstone, Montana · 15085 days ago · 10 km deep · 47 km away
- 1.913 km E of Hebgen Lake Estates, Montana · 15083 days ago · 10 km deep · 48 km away
- 1.774 km NNE of Kelly, Wyoming · 15081 days ago · 9 km deep · 45 km away
Before
Earthquakes todayMontana earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event uu50020965 (also filed as usp0002dr3). Read Tue, Sep 22, 2026, 10:28 PM UTC.