Idaho earthquakes

M2.8 earthquake 26 km W of Challis, Idaho

A magnitude 2.8 earthquake struck 26 km W of Challis, Idaho on Mon, Sep 21, 2015, 7:18 AM MDT (13:18 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.0 8 km ESE 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
2.8 (ml), micro
Local time
UTC
2015-09-21 13:18:42 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
44.542° N, 114.561° 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.

Location uncertainty
About 1.9 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.21
Depth from
Operator assigned
Station coverage gap
63°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 23 in the 30 days before it.

After

  1. 1.8southern Idaho · 4023 days ago · 10 km deep · 24 km away
  2. 1.64 km NNW of Challis, Idaho · 4023 days ago · 8 km deep · 24 km away
  3. 1.629 km N of Sun Valley, Idaho · 4013 days ago · 7 km deep · 66 km away
  4. 2.011 km SE of Challis, Idaho · 4011 days ago · 6 km deep · 37 km away
  5. 2.122 km WNW of Clayton, Idaho · 4007 days ago · 7 km deep · 22 km away
  6. 1.522 km WNW of Clayton, Idaho · 4007 days ago · 4 km deep · 23 km away
  7. 1.94 km NNW of Challis, Idaho · 4007 days ago · -1 km deep · 24 km away
  8. 2.014 km SE of Challis, Idaho · 4005 days ago · 10 km deep · 39 km away · felt by 1
  9. 1.929 km N of Sun Valley, Idaho · 4004 days ago · 10 km deep · 66 km away
  10. 1.814 km SE of Challis, Idaho · 4003 days ago · 11 km deep · 40 km away
  11. 1.632 km ESE of Clayton, Idaho · 4002 days ago · 4 km deep · 59 km away
  12. 2.113 km SE of Challis, Idaho · 3996 days ago · 10 km deep · 39 km away
  13. 1.722 km ESE of Challis, Idaho · 3996 days ago · 9 km deep · 48 km away
  14. 2.5southern Idaho · 3996 days ago · 4 km deep · 38 km away
  15. 2.07 km ESE of Challis, Idaho · 3994 days ago · 9 km deep · 34 km away
  16. 2.510 km ESE of Challis, Idaho · 3993 days ago · 11 km deep · 36 km away
  17. 3.08 km ESE of Challis, Idaho · 3992 days ago · 7 km deep · 34 km away · felt by 1
  18. 2.711 km NNW of Challis, Idaho · 3990 days ago · 4 km deep · 22 km away · felt by 1
  19. 2.110 km NNE of Stanley, Idaho · 3989 days ago · -1 km deep · 37 km away
  20. 2.411 km NNE of Stanley, Idaho · 3986 days ago · 8 km deep · 36 km away
  21. 1.615 km SE of Challis, Idaho · 3984 days ago · 6 km deep · 40 km away
  22. 1.914 km SE of Challis, Idaho · 3984 days ago · 9 km deep · 39 km away
  23. 1.832 km N of Mackay, Idaho · 3982 days ago · 10 km deep · 81 km away
  24. 1.65 km NNW of Challis, Idaho · 3982 days ago · -3 km deep · 24 km away
  25. 1.810 km NNE of Stanley, Idaho · 3976 days ago · -1 km deep · 37 km away
  26. 1.626 km SSW of Clayton, Idaho · 3975 days ago · 14 km deep · 58 km away
  27. 1.823 km NNW of Challis, Idaho · 3974 days ago · -3 km deep · 27 km away
  28. 2.021 km NNW of Challis, Idaho · 3970 days ago · 4 km deep · 27 km away
  29. 2.413 km ESE of Challis, Idaho · 3967 days ago · 11 km deep · 39 km away

Before

  1. 1.914 km W of Clayton, Idaho · 4024 days ago · 6 km deep · 31 km away
  2. 1.513 km W of Clayton, Idaho · 4026 days ago · 10 km deep · 34 km away
  3. 2.013 km W of Clayton, Idaho · 4026 days ago · 9 km deep · 33 km away
  4. 3.310 km SE of Challis, Idaho · 4027 days ago · 10 km deep · 36 km away · felt by 4
  5. 2.030 km E of Clayton, Idaho · 4028 days ago · 5 km deep · 56 km away
  6. 1.913 km SE of Challis, Idaho · 4031 days ago · 13 km deep · 39 km away
  7. 2.524 km NW of Clayton, Idaho · 4034 days ago · 8 km deep · 19 km away
  8. 2.524 km SE of Challis, Idaho · 4036 days ago · 10 km deep · 47 km away
  9. 1.831 km ESE of Cascade, Idaho · 4037 days ago · 13 km deep · 91 km away
  10. 2.411 km SE of Challis, Idaho · 4038 days ago · 11 km deep · 37 km away
  11. 1.912 km ESE of Challis, Idaho · 4038 days ago · 4 km deep · 38 km away
  12. 2.236 km NE of Yellow Pine, Idaho · 4041 days ago · 11 km deep · 87 km away
  13. 2.138 km NE of Yellow Pine, Idaho · 4041 days ago · 5 km deep · 82 km away
  14. 1.515 km SE of Challis, Idaho · 4043 days ago · 7 km deep · 41 km away
  15. 1.636 km SSW of Salmon, Idaho · 4043 days ago · 10 km deep · 52 km away
  16. 1.913 km SE of Challis, Idaho · 4043 days ago · 9 km deep · 38 km away
  17. 2.615 km SE of Challis, Idaho · 4043 days ago · 5 km deep · 41 km away
  18. 2.712 km SE of Challis, Idaho · 4043 days ago · 6 km deep · 38 km away
  19. 2.315 km SE of Challis, Idaho · 4043 days ago · 7 km deep · 40 km away
  20. 2.711 km SE of Challis, Idaho · 4044 days ago · 5 km deep · 37 km away · felt by 1

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us20003mfm (also filed as mb80098699). Read Sun, Sep 27, 2026, 7:27 AM UTC.