Idaho earthquakes

M2.1 earthquake 21 km E of Challis, Idaho

A magnitude 2.1 earthquake struck 21 km E of Challis, Idaho on Thu, Aug 20, 2015, 4:11 PM MDT (22:11 UTC), 13 km (8 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M3.3 10 km SE 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
2.1 (mc), micro
Local time
UTC
2015-08-20 22:11:48 UTC
Depth
12.8 km (8.0 mi), shallow
Epicenter
44.478° N, 113.965° W
Region
Idaho
Tsunami flag
No
Status
Automatic solution, may be revised

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

An automatic solution; a seismologist may revise it.

Location uncertainty
About 2.1 km horizontally, 3.0 km in depth
Magnitude uncertainty
±0.50
Station coverage gap
65°
Stations used
19

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 35 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 2.15 km NNW of Challis, Idaho · 4058 days ago · 11 km deep · 24 km away
  2. 1.910 km SE of Challis, Idaho · 4057 days ago · 11 km deep · 14 km away
  3. 2.339 km NNW of Challis, Idaho · 4056 days ago · 15 km deep · 54 km away
  4. 2.711 km SE of Challis, Idaho · 4047 days ago · 5 km deep · 14 km away · felt by 1
  5. 2.315 km SE of Challis, Idaho · 4047 days ago · 7 km deep · 12 km away
  6. 2.712 km SE of Challis, Idaho · 4046 days ago · 6 km deep · 12 km away
  7. 2.615 km SE of Challis, Idaho · 4046 days ago · 5 km deep · 13 km away
  8. 1.913 km SE of Challis, Idaho · 4046 days ago · 9 km deep · 14 km away
  9. 1.636 km SSW of Salmon, Idaho · 4046 days ago · 10 km deep · 49 km away
  10. 1.515 km SE of Challis, Idaho · 4046 days ago · 7 km deep · 12 km away
  11. 1.912 km ESE of Challis, Idaho · 4042 days ago · 4 km deep · 11 km away
  12. 2.411 km SE of Challis, Idaho · 4041 days ago · 11 km deep · 12 km away
  13. 2.524 km SE of Challis, Idaho · 4039 days ago · 10 km deep · 18 km away
  14. 2.524 km NW of Clayton, Idaho · 4038 days ago · 8 km deep · 56 km away
  15. 1.913 km SE of Challis, Idaho · 4034 days ago · 13 km deep · 12 km away
  16. 2.030 km E of Clayton, Idaho · 4032 days ago · 5 km deep · 29 km away
  17. 3.310 km SE of Challis, Idaho · 4031 days ago · 10 km deep · 13 km away · felt by 4
  18. 2.013 km W of Clayton, Idaho · 4029 days ago · 9 km deep · 54 km away
  19. 1.513 km W of Clayton, Idaho · 4029 days ago · 10 km deep · 55 km away
  20. 1.914 km W of Clayton, Idaho · 4027 days ago · 6 km deep · 55 km away
  21. 2.826 km W of Challis, Idaho · 4027 days ago · 5 km deep · 48 km away
  22. 1.8southern Idaho · 4027 days ago · 10 km deep · 24 km away
  23. 1.64 km NNW of Challis, Idaho · 4026 days ago · 8 km deep · 24 km away
  24. 1.629 km N of Sun Valley, Idaho · 4017 days ago · 7 km deep · 67 km away
  25. 2.011 km SE of Challis, Idaho · 4014 days ago · 6 km deep · 12 km away
  26. 2.122 km WNW of Clayton, Idaho · 4010 days ago · 7 km deep · 56 km away
  27. 1.522 km WNW of Clayton, Idaho · 4010 days ago · 4 km deep · 57 km away
  28. 1.94 km NNW of Challis, Idaho · 4010 days ago · -1 km deep · 24 km away
  29. 2.014 km SE of Challis, Idaho · 4008 days ago · 10 km deep · 12 km away · felt by 1
  30. 1.929 km N of Sun Valley, Idaho · 4008 days ago · 10 km deep · 67 km away
  31. 1.814 km SE of Challis, Idaho · 4007 days ago · 11 km deep · 12 km away
  32. 1.632 km ESE of Clayton, Idaho · 4005 days ago · 4 km deep · 32 km away
  33. 2.113 km SE of Challis, Idaho · 3999 days ago · 10 km deep · 11 km away
  34. 1.722 km ESE of Challis, Idaho · 3999 days ago · 9 km deep · 7 km away
  35. 2.5southern Idaho · 3999 days ago · 4 km deep · 15 km away

Before

  1. 1.68 km NE of Stanley, Idaho · 4061 days ago · 6 km deep · 76 km away
  2. 2.09 km NNE of Stanley, Idaho · 4061 days ago · 13 km deep · 75 km away
  3. 1.87 km NW of Challis, Idaho · 4062 days ago · 6 km deep · 28 km away
  4. 1.96 km NW of Challis, Idaho · 4063 days ago · 4 km deep · 27 km away
  5. 1.630 km WNW of Mackay, Idaho · 4064 days ago · 12 km deep · 47 km away
  6. 2.010 km NW of Challis, Idaho · 4082 days ago · 9 km deep · 30 km away
  7. 2.311 km NW of Challis, Idaho · 4083 days ago · 11 km deep · 31 km away
  8. 2.238 km NNE of Challis, Idaho · 4085 days ago · 14 km deep · 36 km away
  9. 2.113 km SE of Challis, Idaho · 4086 days ago · 14 km deep · 12 km away
  10. 1.914 km SE of Challis, Idaho · 4086 days ago · 13 km deep · 12 km away
  11. 2.311 km SE of Challis, Idaho · 4086 days ago · 10 km deep · 13 km away
  12. 2.613 km NW of Challis, Idaho · 4088 days ago · 9 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb15831685. Read Wed, Sep 30, 2026, 1:51 PM UTC.