Idaho earthquakes

M1.8 earthquake 5 km NNE of Alta, Wyoming

A magnitude 1.8 earthquake struck 5 km NNE of Alta, Wyoming on Mon, Dec 20, 2021, 7:46 AM MST (14:46 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M2.6 9 km W of Bondurant, Wyoming. This one was a foreshock.

Driggs forecastMore in Idaho

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.8 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-12-20 14:46:46 UTC
Depth
11.3 km (7.0 mi), shallow
Epicenter
43.800° N, 111.006° 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 0.6 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.09
Depth from
From location
Station coverage gap
156°
Stations used
18

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 8 in the 30 days before it.

After

  1. 1.922 km SSW of Irwin, Idaho · 1748 days ago · 5 km deep · 72 km away
  2. 2.566 km NNE of Kelly, Wyoming · 1746 days ago · 11 km deep · 72 km away
  3. 1.966 km NNE of Kelly, Wyoming · 1742 days ago · 13 km deep · 72 km away
  4. 1.634 km ESE of West Yellowstone, Montana · 1742 days ago · 6 km deep · 89 km away
  5. 2.366 km NNE of Kelly, Wyoming · 1738 days ago · 11 km deep · 72 km away
  6. 2.69 km W of Bondurant, Wyoming · 1734 days ago · 3 km deep · 77 km away
  7. 1.67 km WNW of Bondurant, Wyoming · 1734 days ago · 13 km deep · 76 km away
  8. 2.38 km W of Bondurant, Wyoming · 1734 days ago · 3 km deep · 77 km away
  9. 1.743 km ESE of West Yellowstone, Montana · 1733 days ago · 3 km deep · 86 km away
  10. 1.716 km SE of Kelly, Wyoming · 1715 days ago · 6 km deep · 53 km away
  11. 2.361 km SSE of Mammoth, Wyoming · 1710 days ago · 0 km deep · 96 km away
  12. 2.151 km SSE of Mammoth, Wyoming · 1699 days ago · 4 km deep · 100 km away
  13. 2.218 km WSW of Alpine Northwest, Wyoming · 1699 days ago · 3 km deep · 80 km away
  14. 1.846 km ESE of West Yellowstone, Montana · 1698 days ago · 2 km deep · 80 km away
  15. 1.63 km ENE of Alpine Northeast, Wyoming · 1696 days ago · 8 km deep · 67 km away
  16. 1.833 km SE of West Yellowstone, Montana · 1696 days ago · 4 km deep · 70 km away · felt by 1
  17. 1.733 km SE of West Yellowstone, Montana · 1695 days ago · 4 km deep · 70 km away · felt by 2
  18. 1.932 km SE of West Yellowstone, Montana · 1695 days ago · 4 km deep · 71 km away

Before

  1. 1.916 km SW of Wilson, Wyoming · 1764 days ago · 5 km deep · 44 km away
  2. 1.946 km ESE of West Yellowstone, Montana · 1770 days ago · 7 km deep · 90 km away
  3. 1.612 km NE of Bondurant, Wyoming · 1771 days ago · 6 km deep · 83 km away
  4. 1.939 km ESE of West Yellowstone, Montana · 1772 days ago · 7 km deep · 90 km away
  5. 1.830 km ESE of West Yellowstone, Montana · 1773 days ago · 8 km deep · 91 km away
  6. 1.99 km W of Bondurant, Wyoming · 1777 days ago · 8 km deep · 77 km away
  7. 2.0Wyoming · 1778 days ago · 0 km deep · 23 km away
  8. 1.532 km ESE of Kelly, Wyoming · 1778 days ago · 5 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80533979. Read Sun, Oct 4, 2026, 7:48 PM UTC.