Montana earthquakes

M1.5 earthquake 21 km SSW of Mammoth, Wyoming

A magnitude 1.5 earthquake struck 21 km SSW of Mammoth, Wyoming on Fri, Jul 27, 2018, 3:21 PM MDT (21:21 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M2.9 25 km ESE of Mammoth, Wyoming. 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 (Md, duration), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2018-07-27 21:21:29 UTC
Depth
3.5 km (2.2 mi), shallow
Epicenter
44.800° N, 110.798° 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, 1.1 km in depth
Magnitude uncertainty
±0.47
Depth from
From location
Station coverage gap
101°
Stations used
14

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 34 in the 60 days after this one and 41 in the 30 days before it.

After

  1. 1.650 km SE of West Yellowstone, Montana · 2989 days ago · 2 km deep · 49 km away
  2. 1.951 km SE of West Yellowstone, Montana · 2988 days ago · 3 km deep · 48 km away
  3. 1.756 km SSW of Silver Gate, Montana · 2983 days ago · 6 km deep · 60 km away
  4. 2.15 km E of Hebgen Lake Estates, Montana · 2983 days ago · 11 km deep · 26 km away
  5. 2.15 km E of Hebgen Lake Estates, Montana · 2983 days ago · 11 km deep · 26 km away
  6. 1.65 km E of Hebgen Lake Estates, Montana · 2982 days ago · 10 km deep · 26 km away
  7. 1.65 km E of Hebgen Lake Estates, Montana · 2982 days ago · 10 km deep · 26 km away
  8. 2.536 km S of Silver Gate, Montana · 2978 days ago · 15 km deep · 61 km away
  9. 1.717 km ENE of Hebgen Lake Estates, Montana · 2975 days ago · 11 km deep · 14 km away
  10. 2.144 km W of Hebgen Lake Estates, Montana · 2975 days ago · 11 km deep · 75 km away
  11. 1.845 km ENE of Warm River, Idaho · 2970 days ago · 7 km deep · 61 km away
  12. 1.6Idaho-Montana border region · 2969 days ago · 10 km deep · 18 km away
  13. 1.513 km E of Hebgen Lake Estates, Montana · 2968 days ago · 10 km deep · 18 km away
  14. 1.849 km ESE of West Yellowstone, Montana · 2964 days ago · 6 km deep · 43 km away
  15. 1.947 km ESE of West Yellowstone, Montana · 2959 days ago · 4 km deep · 41 km away
  16. 1.647 km ESE of West Yellowstone, Montana · 2959 days ago · 4 km deep · 41 km away
  17. 1.7Wyoming · 2959 days ago · 4 km deep · 41 km away
  18. 1.747 km ESE of West Yellowstone, Montana · 2959 days ago · 4 km deep · 41 km away
  19. 2.047 km ESE of West Yellowstone, Montana · 2959 days ago · 4 km deep · 41 km away
  20. 2.047 km ESE of West Yellowstone, Montana · 2959 days ago · 4 km deep · 41 km away
  21. 2.545 km NNE of Spencer, Idaho · 2958 days ago · 5 km deep · 98 km away
  22. 1.823 km SSW of Mammoth, Wyoming · 2956 days ago · 5 km deep · 3 km away
  23. 2.323 km SSW of Mammoth, Wyoming · 2956 days ago · 5 km deep · 3 km away
  24. 2.423 km SSW of Mammoth, Wyoming · 2956 days ago · 5 km deep · 3 km away
  25. 2.222 km SSW of Mammoth, Wyoming · 2956 days ago · 5 km deep · 2 km away
  26. 1.545 km SSE of Mammoth, Wyoming · 2950 days ago · 4 km deep · 36 km away
  27. 1.639 km S of Silver Gate, Montana · 2947 days ago · 13 km deep · 64 km away
  28. 1.640 km S of Silver Gate, Montana · 2947 days ago · 10 km deep · 62 km away
  29. 1.944 km W of Hebgen Lake Estates, Montana · 2944 days ago · 10 km deep · 75 km away
  30. 2.925 km ESE of Mammoth, Wyoming · 2943 days ago · 11 km deep · 30 km away
  31. 2.035 km ESE of Island Park, Idaho · 2941 days ago · 4 km deep · 51 km away
  32. 1.714 km S of West Yellowstone, Montana · 2938 days ago · 13 km deep · 38 km away
  33. 1.754 km SE of West Yellowstone, Montana · 2935 days ago · 6 km deep · 52 km away
  34. 1.647 km ENE of Warm River, Idaho · 2929 days ago · 11 km deep · 61 km away

Before

  1. 1.851 km SE of West Yellowstone, Montana · 2989 days ago · 4 km deep · 48 km away
  2. 1.851 km SE of West Yellowstone, Montana · 2989 days ago · 4 km deep · 49 km away
  3. 1.723 km SSW of Mammoth, Wyoming · 2990 days ago · 5 km deep · 3 km away
  4. 1.623 km SSW of Mammoth, Wyoming · 2990 days ago · 4 km deep · 3 km away
  5. 1.723 km SSW of Mammoth, Wyoming · 2990 days ago · 7 km deep · 3 km away
  6. 1.623 km SSW of Mammoth, Wyoming · 2991 days ago · 5 km deep · 3 km away
  7. 1.623 km SSW of Mammoth, Wyoming · 2991 days ago · 7 km deep · 3 km away
  8. 2.122 km SSW of Mammoth, Wyoming · 2991 days ago · 9 km deep · 2 km away
  9. 1.523 km SSW of Mammoth, Wyoming · 2991 days ago · 7 km deep · 3 km away
  10. 2.123 km SSW of Mammoth, Wyoming · 2991 days ago · 8 km deep · 3 km away
  11. 1.623 km SSW of Mammoth, Wyoming · 2991 days ago · 6 km deep · 3 km away
  12. 1.723 km SSW of Mammoth, Wyoming · 2991 days ago · 7 km deep · 3 km away
  13. 2.123 km SSW of Mammoth, Wyoming · 2991 days ago · 5 km deep · 3 km away
  14. 1.523 km SSW of Mammoth, Wyoming · 2991 days ago · 5 km deep · 3 km away
  15. 2.324 km SSW of Mammoth, Wyoming · 2992 days ago · 5 km deep · 3 km away
  16. 1.823 km SSW of Mammoth, Wyoming · 2992 days ago · 5 km deep · 3 km away
  17. 2.022 km SSW of Mammoth, Wyoming · 2992 days ago · 9 km deep · 2 km away
  18. 2.123 km SSW of Mammoth, Wyoming · 2992 days ago · 8 km deep · 2 km away
  19. 1.622 km SSW of Mammoth, Wyoming · 2992 days ago · 8 km deep · 2 km away
  20. 1.523 km SSW of Mammoth, Wyoming · 2993 days ago · 5 km deep · 3 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60290617. Read Fri, Oct 2, 2026, 7:02 PM UTC.