Idaho earthquakes

M2.3 earthquake 36 km ENE of Challis, Idaho

A magnitude 2.3 earthquake struck 36 km ENE of Challis, Idaho on Tue, Sep 18, 2018, 12:30 AM MDT (06:30 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M2.5 12 km NNE of Stanley, 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
2.3 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2018-09-18 06:30:45 UTC
Depth
11.5 km (7.1 mi), shallow
Epicenter
44.656° N, 113.827° 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 0.9 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
110°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 2.434 km NE of Challis, Idaho · 2938 days ago · 11 km deep · 5 km away
  2. 1.610 km SE of Challis, Idaho · 2929 days ago · 7 km deep · 33 km away
  3. 2.18 km N of Stanley, Idaho · 2921 days ago · 4 km deep · 98 km away
  4. 1.89 km N of Stanley, Idaho · 2921 days ago · 6 km deep · 98 km away
  5. 1.6southern Idaho · 2921 days ago · 6 km deep · 99 km away
  6. 2.512 km NNE of Stanley, Idaho · 2921 days ago · 5 km deep · 92 km away · felt by 1
  7. 1.67 km NNW of Stanley, Idaho · 2921 days ago · 5 km deep · 99 km away
  8. 1.69 km N of Stanley, Idaho · 2920 days ago · 4 km deep · 98 km away
  9. 1.616 km SE of Challis, Idaho · 2920 days ago · 4 km deep · 35 km away
  10. 1.68 km N of Stanley, Idaho · 2917 days ago · 6 km deep · 98 km away
  11. 2.49 km N of Stanley, Idaho · 2917 days ago · 3 km deep · 97 km away
  12. 1.633 km W of Challis, Idaho · 2908 days ago · 2 km deep · 66 km away
  13. 1.634 km NW of Mackay, Idaho · 2905 days ago · 1 km deep · 61 km away
  14. 2.320 km WNW of Mackay, Idaho · 2900 days ago · 6 km deep · 75 km away · felt by 1
  15. 1.65 km N of Stanley, Idaho · 2894 days ago · 3 km deep · 99 km away
  16. 1.76 km N of Stanley, Idaho · 2894 days ago · 0 km deep · 99 km away
  17. 2.19 km NNW of Stanley, Idaho · 2892 days ago · 4 km deep · 99 km away
  18. 2.26 km N of Stanley, Idaho · 2892 days ago · 3 km deep · 98 km away
  19. 1.532 km SW of Lima, Montana · 2887 days ago · 8 km deep · 83 km away
  20. 2.028 km WSW of Dillon, Montana · 2882 days ago · 8 km deep · 84 km away
  21. 1.728 km WSW of Dillon, Montana · 2882 days ago · 8 km deep · 84 km away
  22. 1.729 km WSW of Dillon, Montana · 2882 days ago · 8 km deep · 84 km away
  23. 1.72 km N of Challis, Idaho · 2881 days ago · 1 km deep · 35 km away

Before

  1. 2.813 km SE of Challis, Idaho · 2940 days ago · 5 km deep · 34 km away · felt by 3
  2. 2.126 km SSW of Lima, Montana · 2949 days ago · 8 km deep · 95 km away
  3. 2.339 km NNW of Stanley, Idaho · 2951 days ago · 5 km deep · 99 km away
  4. 2.08 km N of Stanley, Idaho · 2951 days ago · 10 km deep · 97 km away
  5. 1.89 km N of Stanley, Idaho · 2951 days ago · 3 km deep · 98 km away
  6. 1.935 km ESE of Clayton, Idaho · 2956 days ago · 0 km deep · 56 km away
  7. 1.821 km N of Salmon, Idaho · 2956 days ago · 4 km deep · 79 km away
  8. 1.813 km NNE of Clayton, Idaho · 2960 days ago · 3 km deep · 53 km away
  9. 2.07 km N of Stanley, Idaho · 2960 days ago · 13 km deep · 97 km away
  10. 2.333 km WNW of Lima, Montana · 2965 days ago · 16 km deep · 71 km away
  11. 2.110 km W of Clayton, Idaho · 2966 days ago · 13 km deep · 71 km away
  12. 1.610 km SSW of Mackay, Idaho · 2967 days ago · 3 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80310359. Read Sun, Oct 4, 2026, 5:43 PM UTC.