M3.3 earthquake 8 km S of Challis, Idaho
A magnitude 3.3 earthquake struck 8 km S of Challis, Idaho on Fri, Aug 30, 1985, 6:28 PM MDT (00:28 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M4.1 17 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
- 3.3 (ml), minor
- Local time
- UTC
- 1985-08-31 00:28:49 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.427° N, 114.229° 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 7 in the 30 days before it.
After
- 3.021 km ESE of Clayton, Idaho · 14993 days ago · 5 km deep · 25 km away
- 2.819 km E of Clayton, Idaho · 14974 days ago · 5 km deep · 19 km away
- 2.88 km SSW of Challis, Idaho · 14973 days ago · 5 km deep · 4 km away
- 2.414 km NE of Clayton, Idaho · 14961 days ago · 5 km deep · 10 km away
- 2.415 km S of Challis, Idaho · 14961 days ago · 5 km deep · 7 km away
- 3.37 km SE of Challis, Idaho · 14958 days ago · 5 km deep · 5 km away
- 3.18 km SE of Challis, Idaho · 14958 days ago · 5 km deep · 7 km away
- 3.06 km NW of Challis, Idaho · 14947 days ago · 5 km deep · 14 km away
- 4.117 km SE of Challis, Idaho · 14938 days ago · 5 km deep · 13 km away
- 3.215 km SSE of Challis, Idaho · 14937 days ago · 5 km deep · 8 km away
Before
- 3.112 km SW of Challis, Idaho · 15000 days ago · 5 km deep · 10 km away
- 3.62 km SSE of Challis, Idaho · 15000 days ago · 5 km deep · 6 km away
- 3.117 km N of Clayton, Idaho · 15000 days ago · 5 km deep · 15 km away
- 2.75 km ESE of Challis, Idaho · 15005 days ago · 5 km deep · 8 km away
- 3.123 km E of Clayton, Idaho · 15013 days ago · 5 km deep · 20 km away
- 3.010 km SSW of Challis, Idaho · 15014 days ago · 5 km deep · 5 km away
- 2.827 km SE of Clayton, Idaho · 15022 days ago · 5 km deep · 41 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002j9w. Read Tue, Sep 22, 2026, 10:29 AM UTC.