M3.3 earthquake 3 km E of Challis, Idaho
A magnitude 3.3 earthquake struck 3 km E of Challis, Idaho on Mon, Feb 25, 1985, 4:46 AM MST (11:46 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
- 3.3 (ml), minor
- Local time
- UTC
- 1985-02-25 11:46:06 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 44.501° N, 114.190° 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: 11 in the 60 days after this one and 8 in the 30 days before it.
After
- 3.14 km SE of Challis, Idaho · 15182 days ago · 10 km deep · 2 km away
- 4.56 km NE of Challis, Idaho · 15164 days ago · 10 km deep · 6 km away
- 3.18 km SSE of Clayton, Idaho · 15159 days ago · 10 km deep · 38 km away
- 3.539 km ESE of Challis, Idaho · 15158 days ago · 5 km deep · 36 km away
- 3.441 km ESE of Challis, Idaho · 15158 days ago · 5 km deep · 38 km away
- 3.126 km NW of Clayton, Idaho · 15156 days ago · 10 km deep · 35 km away
- 3.130 km NW of Mackay, Idaho · 15150 days ago · 5 km deep · 50 km away
- 3.214 km ENE of Clayton, Idaho · 15140 days ago · 10 km deep · 22 km away
- 3.030 km WNW of Mackay, Idaho · 15136 days ago · 5 km deep · 60 km away
- 3.3Idaho-Montana border region · 15133 days ago · 10 km deep · 66 km away
- 3.34 km SW of Challis, Idaho · 15130 days ago · 10 km deep · 7 km away
Before
- 3.023 km S of Leadore, Idaho · 15190 days ago · 5 km deep · 65 km away
- 3.219 km NNW of Leadore, Idaho · 15197 days ago · 5 km deep · 73 km away
- 3.85 km S of Challis, Idaho · 15198 days ago · 10 km deep · 6 km away
- 3.014 km NNW of Clayton, Idaho · 15198 days ago · 5 km deep · 28 km away
- 3.710 km SSE of Challis, Idaho · 15202 days ago · 10 km deep · 9 km away
- 4.76 km NE of Challis, Idaho · 15203 days ago · 10 km deep · 6 km away
- 3.410 km N of Clayton, Idaho · 15203 days ago · 10 km deep · 24 km away
- 3.88 km WSW of Challis, Idaho · 15203 days ago · 10 km deep · 12 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002c7k. Read Tue, Sep 22, 2026, 9:09 AM UTC.