Idaho earthquakes

M2.1 earthquake 9 km N of Stanley, Idaho

A magnitude 2.1 earthquake struck 9 km N of Stanley, Idaho on Thu, Sep 21, 2017, 4:03 PM MDT (22:03 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M2.7 32 km NNE of Lowman, 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 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2017-09-21 22:03:20 UTC
Depth
10.3 km (6.4 mi), shallow
Epicenter
44.303° N, 114.923° 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 0.5 km horizontally, 1.3 km in depth
Magnitude uncertainty
±0.38
Depth from
From location
Station coverage gap
112°
Stations used
6

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 13 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.18 km N of Stanley, Idaho · 3298 days ago · 4 km deep · 1 km away
  2. 2.6southern Idaho · 3292 days ago · 5 km deep · 64 km away · felt by 1
  3. 1.614 km W of Clayton, Idaho · 3283 days ago · 4 km deep · 28 km away
  4. 1.913 km W of Clayton, Idaho · 3274 days ago · 4 km deep · 28 km away
  5. 2.732 km NNE of Lowman, Idaho · 3274 days ago · 13 km deep · 43 km away · felt by 1
  6. 1.714 km SE of Challis, Idaho · 3272 days ago · 13 km deep · 65 km away
  7. 1.86 km NW of Challis, Idaho · 3260 days ago · 6 km deep · 58 km away
  8. 2.025 km SE of Challis, Idaho · 3259 days ago · 7 km deep · 71 km away
  9. 2.46 km NNW of Idaho City, Idaho · 3255 days ago · 18 km deep · 88 km away
  10. 1.722 km SSW of Clayton, Idaho · 3250 days ago · 9 km deep · 42 km away
  11. 2.222 km SSW of Clayton, Idaho · 3250 days ago · 6 km deep · 41 km away
  12. 2.422 km SSW of Clayton, Idaho · 3242 days ago · 10 km deep · 43 km away · felt by 4
  13. 2.114 km E of Cascade, Idaho · 3239 days ago · 10 km deep · 77 km away

Before

  1. 1.911 km W of Clayton, Idaho · 3306 days ago · 10 km deep · 30 km away
  2. 1.615 km WSW of Challis, Idaho · 3309 days ago · 7 km deep · 44 km away
  3. 1.514 km W of Clayton, Idaho · 3323 days ago · 4 km deep · 28 km away
  4. 2.09 km NNE of Challis, Idaho · 3326 days ago · 10 km deep · 67 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80256934. Read Fri, Oct 2, 2026, 4:05 PM UTC.