Idaho earthquakes

M2.3 earthquake 20 km WNW of Mackay, Idaho

A magnitude 2.3 earthquake struck 20 km WNW of Mackay, Idaho on Fri, Oct 26, 2018, 11:41 AM MDT (17:41 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.1 15 km NNW of Stanley, Idaho. This one was a foreshock.

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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
2018-10-26 17:41:26 UTC
Depth
6.1 km (3.8 mi), shallow
Epicenter
43.977° N, 113.858° W
Region
Idaho
Felt reports
1
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.4 km horizontally, 1.1 km in depth
Magnitude uncertainty
±0.13
Depth from
From location
Station coverage gap
126°
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: 18 in the 60 days after this one and 14 in the 30 days before it.

After

  1. 1.65 km N of Stanley, Idaho · 2893 days ago · 3 km deep · 93 km away
  2. 1.76 km N of Stanley, Idaho · 2893 days ago · 0 km deep · 93 km away
  3. 2.19 km NNW of Stanley, Idaho · 2891 days ago · 4 km deep · 96 km away
  4. 2.26 km N of Stanley, Idaho · 2891 days ago · 3 km deep · 93 km away
  5. 1.532 km SW of Lima, Montana · 2886 days ago · 8 km deep · 94 km away
  6. 1.72 km N of Challis, Idaho · 2879 days ago · 1 km deep · 68 km away
  7. 2.125 km SSW of Clayton, Idaho · 2876 days ago · 5 km deep · 51 km away
  8. 1.69 km NNW of Stanley, Idaho · 2875 days ago · 4 km deep · 95 km away
  9. 3.115 km NNW of Stanley, Idaho · 2874 days ago · 5 km deep · 99 km away · felt by 1
  10. 1.69 km NNW of Stanley, Idaho · 2874 days ago · 4 km deep · 95 km away
  11. 2.88 km ESE of Challis, Idaho · 2868 days ago · 5 km deep · 58 km away · felt by 3
  12. 2.59 km SSE of Clayton, Idaho · 2859 days ago · 5 km deep · 46 km away · felt by 1
  13. 1.619 km NW of Clayton, Idaho · 2856 days ago · 3 km deep · 73 km away
  14. 2.111 km NW of Challis, Idaho · 2855 days ago · 6 km deep · 77 km away
  15. 1.624 km E of Clayton, Idaho · 2853 days ago · 6 km deep · 36 km away
  16. 1.523 km SSE of Leadore, Idaho · 2852 days ago · 8 km deep · 78 km away · felt by 1
  17. 2.420 km SE of Challis, Idaho · 2849 days ago · 5 km deep · 46 km away
  18. 2.429 km E of Carey, Idaho · 2843 days ago · 10 km deep · 76 km away

Before

  1. 1.634 km NW of Mackay, Idaho · 2904 days ago · 1 km deep · 17 km away
  2. 1.633 km W of Challis, Idaho · 2907 days ago · 2 km deep · 90 km away
  3. 2.49 km N of Stanley, Idaho · 2916 days ago · 3 km deep · 94 km away
  4. 1.68 km N of Stanley, Idaho · 2916 days ago · 6 km deep · 94 km away
  5. 1.616 km SE of Challis, Idaho · 2919 days ago · 4 km deep · 50 km away
  6. 1.69 km N of Stanley, Idaho · 2919 days ago · 4 km deep · 94 km away
  7. 1.67 km NNW of Stanley, Idaho · 2920 days ago · 4 km deep · 96 km away
  8. 1.67 km NNW of Stanley, Idaho · 2920 days ago · 5 km deep · 95 km away
  9. 2.512 km NNE of Stanley, Idaho · 2920 days ago · 5 km deep · 91 km away · felt by 1
  10. 1.6southern Idaho · 2920 days ago · 6 km deep · 95 km away
  11. 1.89 km N of Stanley, Idaho · 2920 days ago · 6 km deep · 95 km away
  12. 2.43 km NW of Stanley, Idaho · 2920 days ago · 5 km deep · 94 km away
  13. 2.18 km N of Stanley, Idaho · 2920 days ago · 4 km deep · 94 km away
  14. 1.610 km SE of Challis, Idaho · 2928 days ago · 7 km deep · 57 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80315569. Read Sat, Oct 3, 2026, 1:11 PM UTC.