Montana earthquakes

M1.7 earthquake 27 km S of Mammoth, Wyoming

A magnitude 1.7 earthquake struck 27 km S of Mammoth, Wyoming on Mon, Nov 1, 2021, 12:39 AM MDT (06:39 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.6 35 km S of Silver Gate, Montana. This one was a foreshock.

Gardiner forecastMore in Montana

Map

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

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The earthquake

Magnitude
1.7 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2021-11-01 06:39:10 UTC
Depth
5.4 km (3.3 mi), shallow
Epicenter
44.728° N, 110.671° 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 0.6 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.62
Depth from
From location
Station coverage gap
123°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 29 in the 60 days after this one and 38 in the 30 days before it.

After

  1. 1.728 km S of Mammoth, Wyoming · 1799 days ago · 4 km deep · 1 km away
  2. 1.544 km SE of West Yellowstone, Montana · 1798 days ago · 4 km deep · 37 km away
  3. 1.927 km S of Mammoth, Wyoming · 1793 days ago · 4 km deep · 1 km away
  4. 2.321 km ENE of Hebgen Lake Estates, Montana · 1791 days ago · 8 km deep · 26 km away
  5. 1.526 km W of Hebgen Lake Estates, Montana · 1790 days ago · 13 km deep · 68 km away
  6. 1.621 km ENE of Hebgen Lake Estates, Montana · 1790 days ago · 7 km deep · 26 km away
  7. 2.546 km NE of Alta, Wyoming · 1789 days ago · 10 km deep · 72 km away · felt by 1
  8. 2.246 km NE of Alta, Wyoming · 1789 days ago · 7 km deep · 72 km away
  9. 1.540 km SSE of West Yellowstone, Montana · 1789 days ago · 2 km deep · 44 km away
  10. 1.6Wyoming · 1789 days ago · 9 km deep · 45 km away
  11. 1.727 km S of Mammoth, Wyoming · 1787 days ago · 4 km deep · 1 km away
  12. 1.846 km NE of Alta, Wyoming · 1787 days ago · 10 km deep · 72 km away
  13. 1.950 km SSE of Mammoth, Wyoming · 1783 days ago · 2 km deep · 27 km away
  14. 1.928 km S of Mammoth, Wyoming · 1779 days ago · 4 km deep · 1 km away
  15. 1.829 km S of Mammoth, Wyoming · 1777 days ago · 5 km deep · 2 km away
  16. 1.830 km ESE of West Yellowstone, Montana · 1773 days ago · 8 km deep · 15 km away
  17. 1.939 km ESE of West Yellowstone, Montana · 1773 days ago · 7 km deep · 18 km away
  18. 2.419 km NE of West Yellowstone, Montana · 1771 days ago · 8 km deep · 22 km away
  19. 1.946 km ESE of West Yellowstone, Montana · 1770 days ago · 7 km deep · 23 km away
  20. 1.922 km SSW of Mammoth, Wyoming · 1768 days ago · 4 km deep · 12 km away
  21. 1.619 km ENE of West Yellowstone, Montana · 1764 days ago · 8 km deep · 17 km away
  22. 1.7Wyoming · 1763 days ago · 13 km deep · 53 km away
  23. 1.828 km S of Mammoth, Wyoming · 1761 days ago · 4 km deep · 1 km away
  24. 2.635 km S of Silver Gate, Montana · 1751 days ago · 15 km deep · 53 km away
  25. 1.523 km W of Hebgen Lake Estates, Montana · 1748 days ago · 11 km deep · 65 km away
  26. 2.566 km NNE of Kelly, Wyoming · 1746 days ago · 11 km deep · 71 km away
  27. 1.966 km NNE of Kelly, Wyoming · 1742 days ago · 13 km deep · 71 km away
  28. 1.634 km ESE of West Yellowstone, Montana · 1742 days ago · 6 km deep · 18 km away
  29. 1.620 km ENE of Hebgen Lake Estates, Montana · 1742 days ago · 6 km deep · 23 km away

Before

  1. 2.028 km S of Mammoth, Wyoming · 1799 days ago · 5 km deep · 1 km away
  2. 2.336 km S of Silver Gate, Montana · 1803 days ago · 13 km deep · 51 km away
  3. 1.637 km S of Silver Gate, Montana · 1803 days ago · 14 km deep · 50 km away
  4. 1.937 km S of Silver Gate, Montana · 1803 days ago · 13 km deep · 51 km away
  5. 1.946 km NE of Alta, Wyoming · 1804 days ago · 10 km deep · 72 km away
  6. 2.128 km S of Mammoth, Wyoming · 1806 days ago · 5 km deep · 1 km away
  7. 1.7Wyoming · 1806 days ago · 4 km deep · 2 km away
  8. 1.829 km S of Mammoth, Wyoming · 1806 days ago · 5 km deep · 1 km away
  9. 1.629 km S of Mammoth, Wyoming · 1806 days ago · 5 km deep · 2 km away
  10. 1.631 km ESE of West Yellowstone, Montana · 1806 days ago · 7 km deep · 17 km away
  11. 1.632 km ESE of West Yellowstone, Montana · 1806 days ago · 6 km deep · 17 km away
  12. 1.922 km S of Mammoth, Wyoming · 1806 days ago · 4 km deep · 6 km away
  13. 1.751 km SE of West Yellowstone, Montana · 1810 days ago · 4 km deep · 43 km away
  14. 1.938 km WNW of Hebgen Lake Estates, Montana · 1811 days ago · 10 km deep · 79 km away
  15. 1.647 km ESE of West Yellowstone, Montana · 1812 days ago · 5 km deep · 27 km away
  16. 1.647 km W of Cody, Wyoming · 1814 days ago · 9 km deep · 83 km away
  17. 1.666 km ESE of West Yellowstone, Montana · 1817 days ago · 7 km deep · 42 km away
  18. 1.665 km ESE of West Yellowstone, Montana · 1817 days ago · 7 km deep · 42 km away
  19. 1.528 km E of West Yellowstone, Montana · 1820 days ago · 8 km deep · 10 km away
  20. 1.528 km E of West Yellowstone, Montana · 1820 days ago · 8 km deep · 10 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60466257. Read Sun, Oct 4, 2026, 8:40 PM UTC.