Montana earthquakes

M2.2 earthquake 50 km SSE of Mammoth, Wyoming

A magnitude 2.2 earthquake struck 50 km SSE of Mammoth, Wyoming on Mon, May 18, 2015, 5:10 PM MDT (23:10 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.5 29 km E of West Yellowstone, 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
2015-05-18 23:10:31 UTC
Depth
4.5 km (2.8 mi), shallow
Epicenter
44.583° N, 110.376° 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 0.3 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.58
Depth from
From location
Station coverage gap
69°
Stations used
23

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 1.641 km SE of West Yellowstone, Montana · 4144 days ago · 6 km deep · 42 km away
  2. 1.713 km SE of West Yellowstone, Montana · 4142 days ago · 14 km deep · 49 km away
  3. 1.519 km NE of West Yellowstone, Montana · 4133 days ago · 8 km deep · 46 km away
  4. 1.624 km SSE of West Yellowstone, Montana · 4132 days ago · 5 km deep · 49 km away
  5. 2.448 km SE of West Yellowstone, Montana · 4130 days ago · 4 km deep · 34 km away
  6. 1.848 km SE of West Yellowstone, Montana · 4130 days ago · 4 km deep · 34 km away
  7. 1.548 km SE of West Yellowstone, Montana · 4130 days ago · 4 km deep · 34 km away
  8. 1.6Wyoming · 4124 days ago · 5 km deep · 22 km away
  9. 1.935 km E of West Yellowstone, Montana · 4124 days ago · 2 km deep · 23 km away
  10. 1.8Wyoming · 4123 days ago · 2 km deep · 30 km away
  11. 2.529 km E of West Yellowstone, Montana · 4122 days ago · 8 km deep · 29 km away
  12. 1.720 km SSE of Mammoth, Wyoming · 4121 days ago · 3 km deep · 31 km away
  13. 1.738 km SSE of Mammoth, Wyoming · 4119 days ago · 5 km deep · 12 km away
  14. 1.925 km SE of Mammoth, Wyoming · 4119 days ago · 5 km deep · 26 km away
  15. 1.612 km NNW of Hebgen Lake Estates, Montana · 4110 days ago · 3 km deep · 76 km away
  16. 1.931 km ESE of West Yellowstone, Montana · 4109 days ago · 2 km deep · 28 km away
  17. 1.723 km SSW of Mammoth, Wyoming · 4105 days ago · 10 km deep · 39 km away
  18. 1.625 km W of Hebgen Lake Estates, Montana · 4104 days ago · 1 km deep · 91 km away
  19. 1.833 km SSE of Mammoth, Wyoming · 4102 days ago · 2 km deep · 18 km away
  20. 2.132 km SSE of Mammoth, Wyoming · 4102 days ago · 2 km deep · 18 km away

Before

  1. 3.050 km SSE of Mammoth, Wyoming · 4156 days ago · 4 km deep · 0 km away · felt by 8
  2. 1.74 km SE of Hebgen Lake Estates, Montana · 4162 days ago · 10 km deep · 64 km away
  3. 1.524 km SSE of West Yellowstone, Montana · 4163 days ago · 6 km deep · 48 km away
  4. 1.635 km E of West Yellowstone, Montana · 4165 days ago · 5 km deep · 23 km away
  5. 2.04 km SE of Hebgen Lake Estates, Montana · 4166 days ago · 10 km deep · 64 km away
  6. 2.14 km SE of Hebgen Lake Estates, Montana · 4170 days ago · 9 km deep · 64 km away
  7. 1.74 km SE of Hebgen Lake Estates, Montana · 4170 days ago · 10 km deep · 64 km away
  8. 1.5Idaho-Montana border region · 4170 days ago · 8 km deep · 64 km away
  9. 1.625 km SE of Mammoth, Wyoming · 4176 days ago · 6 km deep · 26 km away
  10. 2.251 km SE of Mammoth, Wyoming · 4178 days ago · 5 km deep · 5 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60111087. Read Sun, Oct 4, 2026, 9:41 AM UTC.