Idaho earthquakes

M2.2 earthquake southern Idaho

A magnitude 2.2 earthquake struck in southern Idaho on Fri, May 20, 2016, 3:56 PM MDT (21:56 UTC), 8 km (5 mi) below the surface.

A larger quake followed: M2.9 9 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
2.2 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2016-05-20 21:56:28 UTC
Depth
8.4 km (5.2 mi), shallow
Epicenter
44.559° N, 114.272° 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, 1.0 km in depth
Magnitude uncertainty
±0.19
Depth from
From location
Station coverage gap
112°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 2.16 km N of Stanley, Idaho · 3781 days ago · 12 km deep · 62 km away
  2. 1.614 km SW of Clayton, Idaho · 3776 days ago · 6 km deep · 48 km away
  3. 2.1southern Idaho · 3766 days ago · 8 km deep · 16 km away
  4. 1.837 km NNW of Stanley, Idaho · 3762 days ago · 5 km deep · 63 km away
  5. 2.320 km SE of Challis, Idaho · 3762 days ago · 10 km deep · 27 km away
  6. 1.76 km NNW of Challis, Idaho · 3762 days ago · -2 km deep · 0 km away
  7. 2.025 km NE of Leadore, Idaho · 3761 days ago · 6 km deep · 97 km away
  8. 1.525 km NE of Leadore, Idaho · 3756 days ago · 4 km deep · 97 km away
  9. 2.99 km SE of Challis, Idaho · 3754 days ago · 7 km deep · 16 km away
  10. 1.924 km WNW of Challis, Idaho · 3747 days ago · 7 km deep · 20 km away
  11. 1.98 km NNW of Challis, Idaho · 3743 days ago · 6 km deep · 2 km away
  12. 1.6Idaho-Montana border region · 3743 days ago · 5 km deep · 43 km away
  13. 1.69 km NNW of Challis, Idaho · 3743 days ago · 7 km deep · 3 km away
  14. 1.710 km NW of Challis, Idaho · 3738 days ago · 3 km deep · 4 km away
  15. 2.013 km SE of Challis, Idaho · 3737 days ago · 5 km deep · 20 km away

Before

  1. 2.638 km NNW of Stanley, Idaho · 3810 days ago · 4 km deep · 63 km away
  2. 1.640 km NNW of Stanley, Idaho · 3810 days ago · 9 km deep · 63 km away
  3. 1.64 km NW of Challis, Idaho · 3815 days ago · 7 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80147849. Read Fri, Oct 2, 2026, 9:41 PM UTC.