Montana earthquakes

M1.9 earthquake 28 km S of Mammoth, Wyoming

A magnitude 1.9 earthquake struck 28 km S of Mammoth, Wyoming on Sun, Nov 21, 2021, 1:23 AM MST (08:23 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.7 26 km SSE of Virginia City, Montana. 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
University of Utah Seismograph Stations
Local time
UTC
2021-11-21 08:23:06 UTC
Depth
4.4 km (2.7 mi), shallow
Epicenter
44.718° N, 110.678° W
Region
Montana
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, 0.4 km in depth
Magnitude uncertainty
±0.05
Depth from
From location
Station coverage gap
149°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 23 in the 60 days after this one and 26 in the 30 days before it.

After

  1. 1.829 km S of Mammoth, Wyoming · 1778 days ago · 5 km deep · 0 km away
  2. 1.830 km ESE of West Yellowstone, Montana · 1774 days ago · 8 km deep · 14 km away
  3. 1.939 km ESE of West Yellowstone, Montana · 1773 days ago · 7 km deep · 17 km away
  4. 2.419 km NE of West Yellowstone, Montana · 1772 days ago · 8 km deep · 22 km away
  5. 1.946 km ESE of West Yellowstone, Montana · 1771 days ago · 7 km deep · 23 km away
  6. 1.922 km SSW of Mammoth, Wyoming · 1769 days ago · 4 km deep · 12 km away
  7. 1.619 km ENE of West Yellowstone, Montana · 1765 days ago · 8 km deep · 17 km away
  8. 1.7Wyoming · 1764 days ago · 13 km deep · 54 km away
  9. 1.828 km S of Mammoth, Wyoming · 1761 days ago · 4 km deep · 0 km away
  10. 2.635 km S of Silver Gate, Montana · 1752 days ago · 15 km deep · 54 km away
  11. 1.523 km W of Hebgen Lake Estates, Montana · 1748 days ago · 11 km deep · 65 km away
  12. 2.566 km NNE of Kelly, Wyoming · 1746 days ago · 11 km deep · 70 km away
  13. 1.966 km NNE of Kelly, Wyoming · 1743 days ago · 13 km deep · 71 km away
  14. 1.634 km ESE of West Yellowstone, Montana · 1742 days ago · 6 km deep · 17 km away
  15. 1.620 km ENE of Hebgen Lake Estates, Montana · 1742 days ago · 6 km deep · 23 km away
  16. 2.366 km NNE of Kelly, Wyoming · 1738 days ago · 11 km deep · 71 km away
  17. 1.617 km SSE of Big Sky, Montana · 1738 days ago · 5 km deep · 68 km away
  18. 1.743 km ESE of West Yellowstone, Montana · 1734 days ago · 3 km deep · 24 km away
  19. 2.522 km SSW of Mammoth, Wyoming · 1733 days ago · 8 km deep · 13 km away
  20. 1.623 km SSW of Mammoth, Wyoming · 1730 days ago · 7 km deep · 13 km away
  21. 2.122 km SSW of Mammoth, Wyoming · 1727 days ago · 9 km deep · 14 km away · felt by 1
  22. 2.041 km SSW of Silver Gate, Montana · 1727 days ago · 4 km deep · 43 km away
  23. 2.726 km SSE of Virginia City, Montana · 1720 days ago · 10 km deep · 100 km away

Before

  1. 1.950 km SSE of Mammoth, Wyoming · 1784 days ago · 2 km deep · 27 km away
  2. 1.846 km NE of Alta, Wyoming · 1787 days ago · 10 km deep · 71 km away
  3. 1.727 km S of Mammoth, Wyoming · 1788 days ago · 4 km deep · 2 km away
  4. 1.6Wyoming · 1789 days ago · 9 km deep · 43 km away
  5. 1.540 km SSE of West Yellowstone, Montana · 1789 days ago · 2 km deep · 43 km away
  6. 2.246 km NE of Alta, Wyoming · 1790 days ago · 7 km deep · 71 km away
  7. 2.546 km NE of Alta, Wyoming · 1790 days ago · 10 km deep · 71 km away · felt by 1
  8. 1.621 km ENE of Hebgen Lake Estates, Montana · 1791 days ago · 7 km deep · 26 km away
  9. 1.526 km W of Hebgen Lake Estates, Montana · 1791 days ago · 13 km deep · 67 km away
  10. 2.321 km ENE of Hebgen Lake Estates, Montana · 1791 days ago · 8 km deep · 26 km away
  11. 1.927 km S of Mammoth, Wyoming · 1794 days ago · 4 km deep · 2 km away
  12. 1.544 km SE of West Yellowstone, Montana · 1798 days ago · 4 km deep · 36 km away
  13. 1.728 km S of Mammoth, Wyoming · 1799 days ago · 4 km deep · 1 km away
  14. 1.727 km S of Mammoth, Wyoming · 1799 days ago · 5 km deep · 1 km away
  15. 2.028 km S of Mammoth, Wyoming · 1799 days ago · 5 km deep · 1 km away
  16. 2.336 km S of Silver Gate, Montana · 1803 days ago · 13 km deep · 51 km away
  17. 1.637 km S of Silver Gate, Montana · 1803 days ago · 14 km deep · 50 km away
  18. 1.937 km S of Silver Gate, Montana · 1803 days ago · 13 km deep · 51 km away
  19. 1.946 km NE of Alta, Wyoming · 1805 days ago · 10 km deep · 71 km away
  20. 2.128 km S of Mammoth, Wyoming · 1806 days ago · 5 km deep · 0 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60469017. Read Mon, Oct 5, 2026, 11:56 AM UTC.