Montana earthquakes

M1.9 earthquake 23 km S of Mammoth, Wyoming

A magnitude 1.9 earthquake struck 23 km S of Mammoth, Wyoming on Thu, Jul 29, 2021, 9:31 AM MDT (15:31 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 44 km ENE of Warm River, Idaho. 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
1.9 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2021-07-29 15:31:02 UTC
Depth
5.2 km (3.2 mi), shallow
Epicenter
44.767° N, 110.713° 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, 1.9 km in depth
Magnitude uncertainty
±0.48
Depth from
From location
Station coverage gap
79°
Stations used
16

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 39 in the 60 days after this one and at least 200 in the 30 days before it.

After

  1. 1.549 km SSE of Mammoth, Wyoming · 1887 days ago · 4 km deep · 33 km away
  2. 2.027 km S of Mammoth, Wyoming · 1886 days ago · 4 km deep · 5 km away
  3. 1.639 km SSE of Mammoth, Wyoming · 1885 days ago · 6 km deep · 22 km away
  4. 1.733 km SE of West Yellowstone, Montana · 1877 days ago · 4 km deep · 33 km away
  5. 3.019 km NE of West Yellowstone, Montana · 1871 days ago · 9 km deep · 18 km away
  6. 1.719 km NE of West Yellowstone, Montana · 1871 days ago · 7 km deep · 18 km away
  7. 1.525 km SE of Mammoth, Wyoming · 1870 days ago · 7 km deep · 21 km away
  8. 1.834 km SSE of Mammoth, Wyoming · 1870 days ago · 4 km deep · 14 km away
  9. 1.743 km W of Hebgen Lake Estates, Montana · 1869 days ago · 8 km deep · 81 km away
  10. 2.128 km SSE of Virginia City, Montana · 1860 days ago · 11 km deep · 95 km away
  11. 2.641 km SSE of Mammoth, Wyoming · 1857 days ago · 5 km deep · 26 km away
  12. 3.041 km SSE of Mammoth, Wyoming · 1857 days ago · 6 km deep · 26 km away · felt by 9
  13. 1.841 km SSE of Mammoth, Wyoming · 1856 days ago · 4 km deep · 26 km away
  14. 1.641 km SSE of Mammoth, Wyoming · 1856 days ago · 8 km deep · 27 km away
  15. 1.545 km ENE of Warm River, Idaho · 1852 days ago · 15 km deep · 57 km away
  16. 3.244 km ENE of Warm River, Idaho · 1852 days ago · 5 km deep · 59 km away
  17. 2.141 km ENE of Warm River, Idaho · 1852 days ago · 6 km deep · 60 km away
  18. 1.642 km ENE of Warm River, Idaho · 1852 days ago · 5 km deep · 59 km away
  19. 1.643 km ENE of Warm River, Idaho · 1852 days ago · 7 km deep · 58 km away
  20. 1.943 km ENE of Warm River, Idaho · 1852 days ago · 7 km deep · 59 km away
  21. 2.343 km ENE of Warm River, Idaho · 1852 days ago · 5 km deep · 59 km away · felt by 1
  22. 1.6Wyoming · 1852 days ago · 6 km deep · 60 km away
  23. 3.044 km ENE of Warm River, Idaho · 1852 days ago · 11 km deep · 60 km away · felt by 1
  24. 2.08 km ESE of Hebgen Lake Estates, Montana · 1849 days ago · 12 km deep · 29 km away
  25. 1.724 km SE of Mammoth, Wyoming · 1846 days ago · 12 km deep · 20 km away
  26. 1.729 km ESE of West Yellowstone, Montana · 1844 days ago · 7 km deep · 21 km away
  27. 1.629 km E of West Yellowstone, Montana · 1842 days ago · 7 km deep · 15 km away
  28. 1.729 km E of West Yellowstone, Montana · 1842 days ago · 7 km deep · 15 km away
  29. 2.215 km ENE of Hebgen Lake Estates, Montana · 1840 days ago · 8 km deep · 23 km away
  30. 1.629 km E of West Yellowstone, Montana · 1838 days ago · 9 km deep · 16 km away
  31. 1.529 km E of West Yellowstone, Montana · 1838 days ago · 6 km deep · 14 km away
  32. 1.720 km NE of West Yellowstone, Montana · 1838 days ago · 7 km deep · 17 km away
  33. 1.829 km E of West Yellowstone, Montana · 1838 days ago · 7 km deep · 14 km away
  34. 2.016 km ENE of Hebgen Lake Estates, Montana · 1836 days ago · 8 km deep · 22 km away
  35. 1.731 km E of West Yellowstone, Montana · 1834 days ago · 6 km deep · 18 km away
  36. 1.631 km ESE of West Yellowstone, Montana · 1834 days ago · 5 km deep · 18 km away
  37. 1.631 km ESE of West Yellowstone, Montana · 1834 days ago · 3 km deep · 19 km away
  38. 1.731 km E of West Yellowstone, Montana · 1834 days ago · 8 km deep · 18 km away
  39. 1.728 km S of Mammoth, Wyoming · 1833 days ago · 4 km deep · 6 km away

Before

  1. 1.720 km S of Mammoth, Wyoming · 1893 days ago · 4 km deep · 2 km away
  2. 1.926 km S of Mammoth, Wyoming · 1893 days ago · 3 km deep · 3 km away
  3. 1.550 km SE of Mammoth, Wyoming · 1897 days ago · 4 km deep · 35 km away
  4. 1.945 km ESE of West Yellowstone, Montana · 1897 days ago · 5 km deep · 31 km away
  5. 2.145 km ESE of West Yellowstone, Montana · 1897 days ago · 3 km deep · 31 km away
  6. 1.818 km ENE of West Yellowstone, Montana · 1898 days ago · 6 km deep · 14 km away
  7. 1.763 km SSE of Mammoth, Wyoming · 1898 days ago · 8 km deep · 44 km away
  8. 1.828 km SSE of Virginia City, Montana · 1898 days ago · 7 km deep · 93 km away
  9. 2.119 km ENE of West Yellowstone, Montana · 1899 days ago · 7 km deep · 14 km away
  10. 2.311 km ESE of Jardine, Montana · 1899 days ago · 13 km deep · 33 km away
  11. 2.064 km ESE of West Yellowstone, Montana · 1900 days ago · 8 km deep · 45 km away
  12. 1.865 km SSE of Mammoth, Wyoming · 1900 days ago · 9 km deep · 47 km away
  13. 1.663 km ESE of West Yellowstone, Montana · 1900 days ago · 2 km deep · 46 km away
  14. 1.6Wyoming · 1900 days ago · 5 km deep · 48 km away
  15. 1.867 km ESE of West Yellowstone, Montana · 1900 days ago · 8 km deep · 49 km away
  16. 2.467 km ESE of West Yellowstone, Montana · 1900 days ago · 9 km deep · 50 km away
  17. 1.667 km ESE of West Yellowstone, Montana · 1901 days ago · 11 km deep · 49 km away
  18. 1.628 km S of Ennis, Montana · 1901 days ago · 11 km deep · 86 km away
  19. 1.7Wyoming · 1901 days ago · 9 km deep · 51 km away
  20. 1.828 km SSE of Virginia City, Montana · 1901 days ago · 7 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60450257. Read Sun, Oct 4, 2026, 7:58 PM UTC.