Montana earthquakes

M1.5 earthquake 26 km SSE of Mammoth, Wyoming

A magnitude 1.5 earthquake struck 26 km SSE of Mammoth, Wyoming on Fri, Oct 27, 2017, 10:20 AM MDT (16:20 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.3 37 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
1.5 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2017-10-27 16:20:32 UTC
Depth
4.2 km (2.6 mi), shallow
Epicenter
44.745° N, 110.628° 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 0.4 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.58
Depth from
From location
Station coverage gap
136°
Stations used
12

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 35 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 1.611 km NE of West Yellowstone, Montana · 3262 days ago · 8 km deep · 29 km away
  2. 1.511 km NE of West Yellowstone, Montana · 3262 days ago · 8 km deep · 29 km away
  3. 1.525 km SSW of Mammoth, Wyoming · 3261 days ago · 7 km deep · 12 km away
  4. 1.911 km NE of West Yellowstone, Montana · 3261 days ago · 7 km deep · 29 km away
  5. 1.811 km NE of West Yellowstone, Montana · 3261 days ago · 8 km deep · 29 km away
  6. 1.811 km NE of West Yellowstone, Montana · 3261 days ago · 8 km deep · 29 km away
  7. 1.711 km NE of West Yellowstone, Montana · 3261 days ago · 7 km deep · 29 km away
  8. 1.811 km NE of West Yellowstone, Montana · 3260 days ago · 8 km deep · 29 km away
  9. 1.911 km NE of West Yellowstone, Montana · 3260 days ago · 9 km deep · 30 km away
  10. 2.211 km NE of West Yellowstone, Montana · 3259 days ago · 8 km deep · 29 km away
  11. 1.650 km ESE of West Yellowstone, Montana · 3259 days ago · 3 km deep · 34 km away
  12. 1.5Wyoming · 3259 days ago · 3 km deep · 34 km away
  13. 1.950 km ESE of West Yellowstone, Montana · 3259 days ago · 2 km deep · 34 km away
  14. 1.750 km ESE of West Yellowstone, Montana · 3259 days ago · 3 km deep · 34 km away
  15. 1.950 km ESE of West Yellowstone, Montana · 3259 days ago · 4 km deep · 34 km away
  16. 1.650 km ESE of West Yellowstone, Montana · 3259 days ago · 3 km deep · 34 km away
  17. 2.250 km ESE of West Yellowstone, Montana · 3259 days ago · 4 km deep · 34 km away
  18. 1.649 km ESE of West Yellowstone, Montana · 3257 days ago · 4 km deep · 33 km away
  19. 1.845 km ENE of Warm River, Idaho · 3255 days ago · 6 km deep · 57 km away
  20. 2.0Idaho-Montana border region · 3253 days ago · 16 km deep · 54 km away
  21. 1.611 km E of Hebgen Lake Estates, Montana · 3241 days ago · 9 km deep · 34 km away
  22. 2.019 km W of Hebgen Lake Estates, Montana · 3232 days ago · 14 km deep · 64 km away
  23. 1.525 km S of Mammoth, Wyoming · 3230 days ago · 3 km deep · 2 km away
  24. 1.624 km SSE of Mammoth, Wyoming · 3230 days ago · 3 km deep · 2 km away
  25. 1.725 km SSW of Mammoth, Wyoming · 3223 days ago · 5 km deep · 14 km away
  26. 2.27 km SW of Hebgen Lake Estates, Montana · 3223 days ago · 15 km deep · 50 km away
  27. 1.525 km SSW of Mammoth, Wyoming · 3223 days ago · 4 km deep · 14 km away
  28. 1.911 km SW of West Yellowstone, Montana · 3223 days ago · 14 km deep · 50 km away
  29. 1.613 km E of Hebgen Lake Estates, Montana · 3222 days ago · 8 km deep · 31 km away
  30. 2.246 km SSW of Silver Gate, Montana · 3220 days ago · 5 km deep · 34 km away
  31. 1.9Idaho-Montana border region · 3215 days ago · 8 km deep · 31 km away
  32. 2.337 km S of Silver Gate, Montana · 3210 days ago · 13 km deep · 51 km away
  33. 1.939 km S of Silver Gate, Montana · 3209 days ago · 10 km deep · 50 km away
  34. 2.037 km S of Silver Gate, Montana · 3204 days ago · 16 km deep · 49 km away
  35. 2.143 km NE of Spencer, Idaho · 3202 days ago · 10 km deep · 99 km away

Before

  1. 1.613 km E of Hebgen Lake Estates, Montana · 3263 days ago · 9 km deep · 31 km away
  2. 1.76 km SW of Hebgen Lake Estates, Montana · 3272 days ago · 13 km deep · 50 km away
  3. 1.767 km ESE of West Yellowstone, Montana · 3290 days ago · 8 km deep · 43 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60013389. Read Fri, Oct 2, 2026, 5:05 PM UTC.