M3.1 earthquake 4 km SE of Challis, Idaho
A magnitude 3.1 earthquake struck 4 km SE of Challis, Idaho on Wed, Feb 27, 1985, 12:29 AM MST (07:29 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.5 6 km NE 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
- 3.1 (ml), minor
- Local time
- UTC
- 1985-02-27 07:29:07 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 44.480° N, 114.187° 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: 10 in the 60 days after this one and 9 in the 30 days before it.
After
- 4.56 km NE of Challis, Idaho · 15169 days ago · 10 km deep · 8 km away
- 3.18 km SSE of Clayton, Idaho · 15164 days ago · 10 km deep · 36 km away
- 3.539 km ESE of Challis, Idaho · 15163 days ago · 5 km deep · 35 km away
- 3.441 km ESE of Challis, Idaho · 15163 days ago · 5 km deep · 37 km away
- 3.126 km NW of Clayton, Idaho · 15161 days ago · 10 km deep · 35 km away
- 3.130 km NW of Mackay, Idaho · 15155 days ago · 5 km deep · 48 km away
- 3.214 km ENE of Clayton, Idaho · 15145 days ago · 10 km deep · 20 km away
- 3.030 km WNW of Mackay, Idaho · 15141 days ago · 5 km deep · 58 km away
- 3.3Idaho-Montana border region · 15138 days ago · 10 km deep · 64 km away
- 3.34 km SW of Challis, Idaho · 15135 days ago · 10 km deep · 7 km away
Before
- 3.33 km E of Challis, Idaho · 15189 days ago · 10 km deep · 2 km away
- 3.023 km S of Leadore, Idaho · 15195 days ago · 5 km deep · 64 km away
- 3.219 km NNW of Leadore, Idaho · 15202 days ago · 5 km deep · 74 km away
- 3.85 km S of Challis, Idaho · 15203 days ago · 10 km deep · 4 km away
- 3.014 km NNW of Clayton, Idaho · 15203 days ago · 5 km deep · 27 km away
- 3.710 km SSE of Challis, Idaho · 15208 days ago · 10 km deep · 7 km away
- 4.76 km NE of Challis, Idaho · 15208 days ago · 10 km deep · 8 km away
- 3.410 km N of Clayton, Idaho · 15208 days ago · 10 km deep · 23 km away
- 3.88 km WSW of Challis, Idaho · 15208 days ago · 10 km deep · 12 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002c91. Read Sun, Sep 27, 2026, 2:16 PM UTC.