M3.3 earthquake 7 km SE of Challis, Idaho
A magnitude 3.3 earthquake struck 7 km SE of Challis, Idaho on Wed, Oct 9, 1985, 1:18 AM MDT (07:18 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
- 1985-10-09 07:18:00 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.448° N, 114.173° 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: 5 in the 60 days after this one and 4 in the 30 days before it.
After
- 3.18 km SE of Challis, Idaho · 14958 days ago · 5 km deep · 2 km away
- 3.06 km NW of Challis, Idaho · 14948 days ago · 5 km deep · 14 km away
- 4.117 km SE of Challis, Idaho · 14938 days ago · 5 km deep · 10 km away
- 3.215 km SSE of Challis, Idaho · 14938 days ago · 5 km deep · 8 km away
- 3.434 km SE of Clayton, Idaho · 14905 days ago · 5 km deep · 43 km away
Before
Earthquakes todayIdaho earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002kmd. Read Tue, Sep 22, 2026, 3:14 PM UTC.