M3.1 earthquake 12 km SW of Challis, Idaho
A magnitude 3.1 earthquake struck 12 km SW of Challis, Idaho on Wed, Aug 28, 1985, 2:20 PM MDT (20:20 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M3.3 8 km S 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
- 1985-08-28 20:20:37 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.425° N, 114.351° 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: 9 in the 60 days after this one and 6 in the 30 days before it.
After
- 3.38 km S of Challis, Idaho · 15005 days ago · 5 km deep · 10 km away
- 3.021 km ESE of Clayton, Idaho · 15000 days ago · 5 km deep · 29 km away
- 2.819 km E of Clayton, Idaho · 14981 days ago · 5 km deep · 23 km away
- 2.88 km SSW of Challis, Idaho · 14980 days ago · 5 km deep · 6 km away
- 2.414 km NE of Clayton, Idaho · 14969 days ago · 5 km deep · 12 km away
- 2.415 km S of Challis, Idaho · 14968 days ago · 5 km deep · 10 km away
- 3.37 km SE of Challis, Idaho · 14965 days ago · 5 km deep · 14 km away
- 3.18 km SE of Challis, Idaho · 14965 days ago · 5 km deep · 16 km away
- 3.06 km NW of Challis, Idaho · 14955 days ago · 5 km deep · 15 km away
Before
- 3.62 km SSE of Challis, Idaho · 15007 days ago · 5 km deep · 13 km away
- 3.117 km N of Clayton, Idaho · 15007 days ago · 5 km deep · 5 km away
- 2.75 km ESE of Challis, Idaho · 15012 days ago · 5 km deep · 16 km away
- 3.123 km E of Clayton, Idaho · 15020 days ago · 5 km deep · 26 km away
- 3.010 km SSW of Challis, Idaho · 15021 days ago · 5 km deep · 5 km away
- 2.827 km SE of Clayton, Idaho · 15029 days ago · 5 km deep · 43 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002j7s. Read Tue, Sep 29, 2026, 2:58 PM UTC.