Idaho earthquakes

M1.9 earthquake 18 km SSW of Irwin, Idaho

A magnitude 1.9 earthquake struck 18 km SSW of Irwin, Idaho on Mon, Apr 4, 2016, 7:11 PM MDT (01:11 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M2.7 8 km ESE of Grace, 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
1.9 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2016-04-05 01:11:41 UTC
Depth
5.9 km (3.7 mi), shallow
Epicenter
43.269° N, 111.427° 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, 10.5 km in depth
Magnitude uncertainty
±0.29
Depth from
Operator assigned
Station coverage gap
186°, poorly surrounded by stations
Stations used
9

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 17 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 2.36 km S of Hoback, Wyoming · 3827 days ago · -2 km deep · 54 km away
  2. 2.47 km SSE of Hoback, Wyoming · 3820 days ago · 4 km deep · 54 km away
  3. 1.6Wyoming · 3820 days ago · 12 km deep · 49 km away
  4. 1.96 km S of Hoback, Wyoming · 3820 days ago · 5 km deep · 53 km away
  5. 1.96 km SE of Hoback, Wyoming · 3819 days ago · -2 km deep · 56 km away
  6. 1.68 km ENE of Alta, Wyoming · 3819 days ago · 4 km deep · 69 km away
  7. 1.98 km ENE of Alta, Wyoming · 3819 days ago · 5 km deep · 68 km away
  8. 2.28 km ENE of Alta, Wyoming · 3819 days ago · 10 km deep · 69 km away
  9. 2.59 km SE of Hoback, Wyoming · 3817 days ago · 2 km deep · 58 km away
  10. 2.49 km S of Hoback, Wyoming · 3817 days ago · 6 km deep · 54 km away
  11. 1.75 km SSE of Hoback, Wyoming · 3816 days ago · 5 km deep · 54 km away
  12. 1.825 km S of Irwin, Idaho · 3810 days ago · 5 km deep · 11 km away
  13. 1.69 km W of Hoback, Wyoming · 3809 days ago · 2 km deep · 42 km away
  14. 2.78 km ESE of Grace, Idaho · 3800 days ago · 5 km deep · 81 km away
  15. 1.919 km E of Kelly, Wyoming · 3788 days ago · 5 km deep · 93 km away
  16. 1.514 km WSW of Georgetown, Idaho · 3786 days ago · 6 km deep · 94 km away
  17. 1.99 km S of Hoback, Wyoming · 3776 days ago · 4 km deep · 54 km away

Before

  1. 1.613 km E of Alta, Wyoming · 3845 days ago · 7 km deep · 71 km away
  2. 1.922 km ESE of Jackson, Wyoming · 3849 days ago · 6 km deep · 77 km away
  3. 2.112 km E of Alta, Wyoming · 3862 days ago · 9 km deep · 70 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80132499. Read Fri, Oct 2, 2026, 4:35 PM UTC.