M3.9 earthquake 44 km NNW of Stanley, Idaho
A magnitude 3.9 earthquake struck 44 km NNW of Stanley, Idaho on Tue, Feb 21, 1978, 5:37 PM MST (00:37 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M4.1 25 km NNE of Lowman, Idaho. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.9 (mb), minor
- Local time
- UTC
- 1978-02-22 00:37:00 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.605° N, 115.070° W
- Region
- Idaho
- 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
- Stations used
- 14
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.032 km ENE of Challis, Idaho · 17741 days ago · 5 km deep · 94 km away
- 3.214 km W of Challis, Idaho · 17720 days ago · 5 km deep · 53 km away
- 4.125 km NNE of Lowman, Idaho · 17716 days ago · 5 km deep · 48 km away
Before
Earthquakes todayIdaho earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000t34. Read Tue, Sep 22, 2026, 8:45 PM UTC.