M2.8 earthquake 8 km SSW of Challis, Idaho
A magnitude 2.8 earthquake struck 8 km SSW of Challis, Idaho on Tue, Sep 24, 1985, 2:19 AM MDT (08:19 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M3.3 7 km SE 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
- 2.8 (ml), micro
- Local time
- UTC
- 1985-09-24 08:19:29 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.434° N, 114.276° 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 6 in the 30 days before it.
After
- 2.414 km NE of Clayton, Idaho · 14962 days ago · 5 km deep · 10 km away
- 2.415 km S of Challis, Idaho · 14961 days ago · 5 km deep · 8 km away
- 3.37 km SE of Challis, Idaho · 14958 days ago · 5 km deep · 8 km away
- 3.18 km SE of Challis, Idaho · 14958 days ago · 5 km deep · 10 km away
- 3.06 km NW of Challis, Idaho · 14948 days ago · 5 km deep · 13 km away
- 4.117 km SE of Challis, Idaho · 14938 days ago · 5 km deep · 17 km away
- 3.215 km SSE of Challis, Idaho · 14938 days ago · 5 km deep · 11 km away
Before
- 2.819 km E of Clayton, Idaho · 14974 days ago · 5 km deep · 21 km away
- 3.021 km ESE of Clayton, Idaho · 14994 days ago · 5 km deep · 27 km away
- 3.38 km S of Challis, Idaho · 14998 days ago · 5 km deep · 4 km away
- 3.112 km SW of Challis, Idaho · 15000 days ago · 5 km deep · 6 km away
- 3.62 km SSE of Challis, Idaho · 15000 days ago · 5 km deep · 7 km away
- 3.117 km N of Clayton, Idaho · 15000 days ago · 5 km deep · 11 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002k2k. Read Tue, Sep 22, 2026, 5:19 PM UTC.