Idaho earthquakes

M3.8 earthquake 5 km S of Challis, Idaho

A magnitude 3.8 earthquake struck 5 km S of Challis, Idaho on Mon, Feb 11, 1985, 9:07 AM MST (16:07 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.

Challis forecastMore in Idaho

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
3.8 (ml), minor
Local time
UTC
1985-02-11 16:07:03 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
44.457° N, 114.233° 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 7 in the 30 days before it.

After

  1. 3.219 km NNW of Leadore, Idaho · 15197 days ago · 5 km deep · 79 km away
  2. 3.023 km S of Leadore, Idaho · 15190 days ago · 5 km deep · 68 km away
  3. 3.33 km E of Challis, Idaho · 15184 days ago · 10 km deep · 6 km away
  4. 3.14 km SE of Challis, Idaho · 15182 days ago · 10 km deep · 4 km away
  5. 4.56 km NE of Challis, Idaho · 15164 days ago · 10 km deep · 11 km away
  6. 3.18 km SSE of Clayton, Idaho · 15159 days ago · 10 km deep · 32 km away
  7. 3.539 km ESE of Challis, Idaho · 15158 days ago · 5 km deep · 38 km away
  8. 3.441 km ESE of Challis, Idaho · 15158 days ago · 5 km deep · 39 km away
  9. 3.126 km NW of Clayton, Idaho · 15156 days ago · 10 km deep · 31 km away
  10. 3.130 km NW of Mackay, Idaho · 15150 days ago · 5 km deep · 48 km away
  11. 3.214 km ENE of Clayton, Idaho · 15140 days ago · 10 km deep · 17 km away

Before

  1. 3.014 km NNW of Clayton, Idaho · 15198 days ago · 5 km deep · 23 km away
  2. 3.710 km SSE of Challis, Idaho · 15202 days ago · 10 km deep · 6 km away
  3. 4.76 km NE of Challis, Idaho · 15202 days ago · 10 km deep · 11 km away
  4. 3.410 km N of Clayton, Idaho · 15203 days ago · 10 km deep · 19 km away
  5. 3.88 km WSW of Challis, Idaho · 15203 days ago · 10 km deep · 9 km away
  6. 3.722 km NNE of Challis, Idaho · 15222 days ago · 10 km deep · 28 km away
  7. 3.415 km N of Challis, Idaho · 15227 days ago · 10 km deep · 21 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002btu. Read Tue, Sep 22, 2026, 6:56 AM UTC.