Montana earthquakes

M1.5 earthquake 39 km SSE of Mammoth, Wyoming

A magnitude 1.5 earthquake struck 39 km SSE of Mammoth, Wyoming on Tue, Mar 9, 2021, 3:11 PM MST (22:11 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.5 23 km NE of West Yellowstone, 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
1.5 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2021-03-09 22:11:54 UTC
Depth
4.4 km (2.8 mi), shallow
Epicenter
44.667° N, 110.465° 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 1.0 km horizontally, 0.9 km in depth
Magnitude uncertainty
±0.55
Depth from
From location
Station coverage gap
164°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 21 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 1.517 km ESE of West Yellowstone, Montana · 2036 days ago · 12 km deep · 37 km away
  2. 1.627 km SE of Mammoth, Wyoming · 2034 days ago · 9 km deep · 16 km away
  3. 2.115 km NE of West Yellowstone, Montana · 2034 days ago · 9 km deep · 41 km away
  4. 2.125 km S of Mammoth, Wyoming · 2032 days ago · 3 km deep · 19 km away
  5. 1.627 km WNW of Hebgen Lake Estates, Montana · 2032 days ago · 12 km deep · 86 km away
  6. 1.628 km WNW of Hebgen Lake Estates, Montana · 2031 days ago · 13 km deep · 86 km away
  7. 2.427 km WNW of Hebgen Lake Estates, Montana · 2030 days ago · 13 km deep · 86 km away
  8. 1.833 km E of West Yellowstone, Montana · 2028 days ago · 6 km deep · 18 km away
  9. 1.838 km S of Silver Gate, Montana · 2027 days ago · 14 km deep · 37 km away
  10. 1.822 km SSW of Mammoth, Wyoming · 2026 days ago · 4 km deep · 29 km away
  11. 1.923 km SSW of Mammoth, Wyoming · 2026 days ago · 4 km deep · 29 km away
  12. 1.641 km S of Silver Gate, Montana · 2020 days ago · 16 km deep · 37 km away
  13. 2.336 km S of Silver Gate, Montana · 2020 days ago · 13 km deep · 35 km away
  14. 1.731 km SSE of Mammoth, Wyoming · 2019 days ago · 3 km deep · 8 km away
  15. 1.626 km SSE of Cooke City, Montana · 2015 days ago · 15 km deep · 58 km away
  16. 1.830 km ESE of West Yellowstone, Montana · 2014 days ago · 5 km deep · 30 km away
  17. 1.625 km SSE of Mammoth, Wyoming · 2006 days ago · 3 km deep · 16 km away
  18. 2.228 km SE of Mammoth, Wyoming · 1993 days ago · 5 km deep · 11 km away
  19. 2.165 km NNE of Kelly, Wyoming · 1988 days ago · 10 km deep · 56 km away
  20. 2.523 km NE of West Yellowstone, Montana · 1987 days ago · 11 km deep · 38 km away
  21. 1.518 km ENE of West Yellowstone, Montana · 1977 days ago · 8 km deep · 36 km away

Before

  1. 1.817 km ESE of West Yellowstone, Montana · 2036 days ago · 12 km deep · 37 km away
  2. 1.929 km ENE of Alta, Wyoming · 2036 days ago · 10 km deep · 88 km away
  3. 1.639 km SE of Mammoth, Wyoming · 2040 days ago · 4 km deep · 5 km away
  4. 2.426 km SE of Mammoth, Wyoming · 2042 days ago · 8 km deep · 17 km away
  5. 1.613 km SE of West Yellowstone, Montana · 2044 days ago · 11 km deep · 40 km away
  6. 1.623 km WNW of Hebgen Lake Estates, Montana · 2047 days ago · 9 km deep · 81 km away
  7. 2.022 km WNW of Hebgen Lake Estates, Montana · 2047 days ago · 10 km deep · 80 km away
  8. 1.626 km SSE of West Yellowstone, Montana · 2057 days ago · 8 km deep · 45 km away
  9. 1.958 km SSE of Mammoth, Wyoming · 2059 days ago · 2 km deep · 20 km away
  10. 2.21 km SSW of West Yellowstone, Montana · 2064 days ago · 10 km deep · 51 km away · felt by 1

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60428972. Read Mon, Oct 5, 2026, 12:54 PM UTC.