Idaho earthquakes

M3.3 earthquake 20 km ESE of Challis, Idaho

A magnitude 3.3 earthquake struck 20 km ESE of Challis, Idaho on Mon, Jul 8, 1985, 8:30 AM MDT (14:30 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.5 37 km WSW of Salmon, 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
3.3 (ml), minor
Local time
UTC
1985-07-08 14:30:43 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
44.437° N, 113.992° 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: 16 in the 60 days after this one and 2 in the 30 days before it.

After

  1. 3.026 km SE of Stanley, Idaho · 15043 days ago · 5 km deep · 73 km away
  2. 2.824 km SSE of Clayton, Idaho · 15043 days ago · 5 km deep · 52 km away
  3. 3.537 km WSW of Salmon, Idaho · 15042 days ago · 5 km deep · 77 km away
  4. 3.638 km WSW of Salmon, Idaho · 15042 days ago · 5 km deep · 73 km away
  5. 3.624 km SSE of Stanley, Idaho · 15040 days ago · 5 km deep · 82 km away
  6. 3.511 km ESE of Challis, Idaho · 15039 days ago · 5 km deep · 10 km away
  7. 3.120 km ENE of Clayton, Idaho · 15031 days ago · 5 km deep · 19 km away
  8. 2.827 km SE of Clayton, Idaho · 15022 days ago · 5 km deep · 45 km away
  9. 3.010 km SSW of Challis, Idaho · 15014 days ago · 5 km deep · 24 km away
  10. 3.123 km E of Clayton, Idaho · 15013 days ago · 5 km deep · 21 km away
  11. 2.75 km ESE of Challis, Idaho · 15005 days ago · 5 km deep · 15 km away
  12. 3.117 km N of Clayton, Idaho · 15000 days ago · 5 km deep · 34 km away
  13. 3.62 km SSE of Challis, Idaho · 15000 days ago · 5 km deep · 18 km away
  14. 3.112 km SW of Challis, Idaho · 15000 days ago · 5 km deep · 29 km away
  15. 3.38 km S of Challis, Idaho · 14997 days ago · 5 km deep · 19 km away
  16. 3.021 km ESE of Clayton, Idaho · 14993 days ago · 5 km deep · 28 km away

Before

  1. 3.015 km S of Clayton, Idaho · 15062 days ago · 5 km deep · 47 km away
  2. 3.01 km ESE of Challis, Idaho · 15077 days ago · 5 km deep · 19 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0002gku. Read Tue, Sep 22, 2026, 10:02 AM UTC.