M3.7 earthquake 13 km NNE of Challis, Idaho
A magnitude 3.7 earthquake struck 13 km NNE of Challis, Idaho on Wed, Feb 26, 1986, 8:05 AM MST (15:05 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M4.1 19 km SSE of Challis, Idaho. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.7 (ml), minor
- Local time
- UTC
- 1986-02-26 15:05:49 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.627° N, 114.192° 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
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 5 in the 30 days before it.
After
- 3.110 km S of Challis, Idaho · 14793 days ago · 5 km deep · 25 km away
- 4.119 km SSE of Challis, Idaho · 14778 days ago · 5 km deep · 32 km away
- 3.019 km E of Clayton, Idaho · 14772 days ago · 5 km deep · 38 km away
- 3.524 km E of Clayton, Idaho · 14769 days ago · 5 km deep · 40 km away
- 3.022 km SSE of Challis, Idaho · 14768 days ago · 5 km deep · 34 km away
- 2.89 km S of Stanley, Idaho · 14765 days ago · 5 km deep · 80 km away
- 2.631 km ESE of Leadore, Idaho · 14759 days ago · 5 km deep · 94 km away
Before
- 2.715 km SSE of Challis, Idaho · 14835 days ago · 5 km deep · 27 km away
- 2.819 km ESE of Clayton, Idaho · 14839 days ago · 5 km deep · 51 km away
- 3.319 km SE of Clayton, Idaho · 14847 days ago · 5 km deep · 54 km away
- 3.736 km ESE of Clayton, Idaho · 14847 days ago · 5 km deep · 53 km away
- 4.037 km NW of Mackay, Idaho · 14847 days ago · 5 km deep · 56 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002rb5. Read Tue, Sep 22, 2026, 7:24 AM UTC.