Montana earthquakes

M1.5 earthquake 25 km SSW of Mammoth, Wyoming

A magnitude 1.5 earthquake struck 25 km SSW of Mammoth, Wyoming on Sat, Oct 28, 2017, 6:06 AM MDT (12:06 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.8 2 km W of Gallatin Gateway, Montana. This one was a foreshock.

West Yellowstone 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
2017-10-28 12:06:46 UTC
Depth
7.2 km (4.5 mi), shallow
Epicenter
44.749° N, 110.779° 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 0.5 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.56
Depth from
From location
Station coverage gap
151°
Stations used
17

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 36 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.911 km NE of West Yellowstone, Montana · 3260 days ago · 7 km deep · 18 km away
  2. 1.811 km NE of West Yellowstone, Montana · 3260 days ago · 8 km deep · 18 km away
  3. 1.811 km NE of West Yellowstone, Montana · 3260 days ago · 8 km deep · 17 km away
  4. 1.711 km NE of West Yellowstone, Montana · 3260 days ago · 7 km deep · 17 km away
  5. 1.811 km NE of West Yellowstone, Montana · 3259 days ago · 8 km deep · 18 km away
  6. 1.911 km NE of West Yellowstone, Montana · 3259 days ago · 9 km deep · 18 km away
  7. 2.211 km NE of West Yellowstone, Montana · 3258 days ago · 8 km deep · 18 km away
  8. 1.650 km ESE of West Yellowstone, Montana · 3257 days ago · 3 km deep · 38 km away
  9. 1.5Wyoming · 3257 days ago · 3 km deep · 38 km away
  10. 1.950 km ESE of West Yellowstone, Montana · 3257 days ago · 2 km deep · 39 km away
  11. 1.750 km ESE of West Yellowstone, Montana · 3257 days ago · 3 km deep · 39 km away
  12. 1.950 km ESE of West Yellowstone, Montana · 3257 days ago · 4 km deep · 38 km away
  13. 1.650 km ESE of West Yellowstone, Montana · 3257 days ago · 3 km deep · 38 km away
  14. 2.250 km ESE of West Yellowstone, Montana · 3257 days ago · 4 km deep · 38 km away
  15. 1.649 km ESE of West Yellowstone, Montana · 3256 days ago · 4 km deep · 37 km away
  16. 1.845 km ENE of Warm River, Idaho · 3254 days ago · 6 km deep · 56 km away
  17. 2.0Idaho-Montana border region · 3252 days ago · 16 km deep · 44 km away
  18. 2.82 km W of Gallatin Gateway, Montana · 3251 days ago · 9 km deep · 100 km away · felt by 13
  19. 1.641 km NNE of Spencer, Idaho · 3242 days ago · 13 km deep · 92 km away
  20. 1.611 km E of Hebgen Lake Estates, Montana · 3240 days ago · 9 km deep · 22 km away
  21. 2.019 km W of Hebgen Lake Estates, Montana · 3231 days ago · 14 km deep · 52 km away
  22. 1.525 km S of Mammoth, Wyoming · 3229 days ago · 3 km deep · 10 km away
  23. 1.624 km SSE of Mammoth, Wyoming · 3229 days ago · 3 km deep · 11 km away
  24. 2.442 km NNE of Spencer, Idaho · 3227 days ago · 6 km deep · 92 km away
  25. 1.725 km SSW of Mammoth, Wyoming · 3222 days ago · 5 km deep · 2 km away
  26. 2.27 km SW of Hebgen Lake Estates, Montana · 3222 days ago · 15 km deep · 38 km away
  27. 1.525 km SSW of Mammoth, Wyoming · 3222 days ago · 4 km deep · 2 km away
  28. 1.911 km SW of West Yellowstone, Montana · 3222 days ago · 14 km deep · 39 km away
  29. 1.613 km E of Hebgen Lake Estates, Montana · 3221 days ago · 8 km deep · 19 km away
  30. 2.246 km SSW of Silver Gate, Montana · 3219 days ago · 5 km deep · 45 km away
  31. 1.9Idaho-Montana border region · 3214 days ago · 8 km deep · 20 km away
  32. 1.740 km NNE of Spencer, Idaho · 3213 days ago · 7 km deep · 93 km away
  33. 2.337 km S of Silver Gate, Montana · 3209 days ago · 13 km deep · 63 km away
  34. 1.939 km S of Silver Gate, Montana · 3207 days ago · 10 km deep · 62 km away
  35. 2.037 km S of Silver Gate, Montana · 3203 days ago · 16 km deep · 61 km away
  36. 2.143 km NE of Spencer, Idaho · 3201 days ago · 10 km deep · 87 km away

Before

  1. 1.511 km NE of West Yellowstone, Montana · 3260 days ago · 8 km deep · 17 km away
  2. 1.611 km NE of West Yellowstone, Montana · 3260 days ago · 8 km deep · 17 km away
  3. 1.526 km SSE of Mammoth, Wyoming · 3261 days ago · 4 km deep · 12 km away
  4. 1.613 km E of Hebgen Lake Estates, Montana · 3262 days ago · 9 km deep · 19 km away
  5. 1.76 km SW of Hebgen Lake Estates, Montana · 3271 days ago · 13 km deep · 38 km away
  6. 1.728 km SSE of Virginia City, Montana · 3280 days ago · 10 km deep · 91 km away
  7. 1.767 km ESE of West Yellowstone, Montana · 3289 days ago · 8 km deep · 51 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60255017. Read Thu, Oct 1, 2026, 3:17 PM UTC.