Montana earthquakes

M2.2 earthquake 28 km SE of Mammoth, Wyoming

A magnitude 2.2 earthquake struck 28 km SE of Mammoth, Wyoming on Wed, Apr 21, 2021, 10:38 AM MDT (16:38 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.7 36 km S of Silver Gate, 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
2.2 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2021-04-21 16:38:58 UTC
Depth
4.8 km (3.0 mi), shallow
Epicenter
44.766° N, 110.488° 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
±0.69
Depth from
From location
Station coverage gap
108°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 24 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.165 km NNE of Kelly, Wyoming · 1987 days ago · 10 km deep · 67 km away
  2. 2.523 km NE of West Yellowstone, Montana · 1986 days ago · 11 km deep · 32 km away
  3. 1.518 km ENE of West Yellowstone, Montana · 1977 days ago · 8 km deep · 33 km away
  4. 1.621 km NE of West Yellowstone, Montana · 1970 days ago · 5 km deep · 33 km away
  5. 1.835 km SSW of Silver Gate, Montana · 1969 days ago · 9 km deep · 33 km away
  6. 1.748 km ESE of West Yellowstone, Montana · 1967 days ago · 2 km deep · 33 km away
  7. 2.227 km SSE of Mammoth, Wyoming · 1965 days ago · 5 km deep · 12 km away
  8. 2.128 km S of Mammoth, Wyoming · 1965 days ago · 6 km deep · 13 km away
  9. 2.028 km S of Mammoth, Wyoming · 1965 days ago · 6 km deep · 12 km away
  10. 1.856 km SE of West Yellowstone, Montana · 1960 days ago · 4 km deep · 51 km away
  11. 1.555 km SE of West Yellowstone, Montana · 1960 days ago · 5 km deep · 50 km away
  12. 2.355 km SE of West Yellowstone, Montana · 1960 days ago · 4 km deep · 51 km away
  13. 2.055 km SE of West Yellowstone, Montana · 1960 days ago · 4 km deep · 51 km away
  14. 2.556 km SE of West Yellowstone, Montana · 1960 days ago · 5 km deep · 51 km away
  15. 1.757 km ESE of West Yellowstone, Montana · 1953 days ago · 3 km deep · 33 km away
  16. 1.525 km SE of West Yellowstone, Montana · 1953 days ago · 9 km deep · 45 km away
  17. 1.535 km NNE of Alta, Wyoming · 1952 days ago · 10 km deep · 86 km away
  18. 2.736 km S of Silver Gate, Montana · 1951 days ago · 15 km deep · 39 km away
  19. 1.635 km S of Silver Gate, Montana · 1950 days ago · 14 km deep · 38 km away
  20. 1.550 km SSE of Mammoth, Wyoming · 1950 days ago · 2 km deep · 21 km away
  21. 1.7Wyoming · 1946 days ago · 5 km deep · 20 km away
  22. 1.538 km WNW of Hebgen Lake Estates, Montana · 1942 days ago · 11 km deep · 93 km away
  23. 1.7Wyoming · 1940 days ago · 3 km deep · 61 km away
  24. 1.827 km E of West Yellowstone, Montana · 1939 days ago · 6 km deep · 24 km away

Before

  1. 1.625 km SSE of Mammoth, Wyoming · 2005 days ago · 3 km deep · 11 km away
  2. 1.830 km ESE of West Yellowstone, Montana · 2013 days ago · 5 km deep · 36 km away
  3. 1.626 km SSE of Cooke City, Montana · 2014 days ago · 15 km deep · 58 km away
  4. 1.731 km SSE of Mammoth, Wyoming · 2018 days ago · 3 km deep · 3 km away
  5. 2.336 km S of Silver Gate, Montana · 2019 days ago · 13 km deep · 38 km away
  6. 1.641 km S of Silver Gate, Montana · 2019 days ago · 16 km deep · 41 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60433442. Read Sun, Oct 4, 2026, 6:51 PM UTC.