Montana earthquakes

M1.5 earthquake 45 km SSE of Mammoth, Wyoming

A magnitude 1.5 earthquake struck 45 km SSE of Mammoth, Wyoming on Tue, Sep 4, 2018, 6:10 PM MDT (00:10 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 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2018-09-05 00:10:25 UTC
Depth
4.0 km (2.5 mi), shallow
Epicenter
44.613° N, 110.433° 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 0.8 km horizontally, 1.3 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
131°
Stations used
10

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 25 in the 60 days after this one and 18 in the 30 days before it.

After

  1. 1.639 km S of Silver Gate, Montana · 2946 days ago · 13 km deep · 33 km away
  2. 1.640 km S of Silver Gate, Montana · 2946 days ago · 10 km deep · 31 km away
  3. 2.925 km ESE of Mammoth, Wyoming · 2942 days ago · 11 km deep · 28 km away
  4. 2.035 km ESE of Island Park, Idaho · 2940 days ago · 4 km deep · 50 km away
  5. 1.714 km S of West Yellowstone, Montana · 2937 days ago · 13 km deep · 54 km away
  6. 1.754 km SE of West Yellowstone, Montana · 2934 days ago · 6 km deep · 29 km away
  7. 2.427 km NE of Kelly, Wyoming · 2931 days ago · 11 km deep · 94 km away
  8. 1.647 km ENE of Warm River, Idaho · 2928 days ago · 11 km deep · 48 km away
  9. 1.734 km S of Silver Gate, Montana · 2924 days ago · 17 km deep · 36 km away
  10. 2.713 km NE of West Yellowstone, Montana · 2919 days ago · 10 km deep · 46 km away
  11. 2.323 km SW of Mammoth, Wyoming · 2918 days ago · 7 km deep · 42 km away
  12. 1.746 km ENE of Warm River, Idaho · 2917 days ago · 4 km deep · 49 km away
  13. 1.531 km ESE of Island Park, Idaho · 2916 days ago · 8 km deep · 53 km away
  14. 1.545 km SSE of Mammoth, Wyoming · 2915 days ago · 2 km deep · 1 km away
  15. 1.711 km NNE of Tetonia, Idaho · 2914 days ago · 11 km deep · 94 km away · felt by 1
  16. 1.745 km ENE of Warm River, Idaho · 2913 days ago · 6 km deep · 47 km away
  17. 2.610 km NNE of West Yellowstone, Montana · 2910 days ago · 7 km deep · 50 km away
  18. 2.011 km NNE of West Yellowstone, Montana · 2908 days ago · 7 km deep · 50 km away
  19. 2.212 km NNE of West Yellowstone, Montana · 2907 days ago · 9 km deep · 50 km away
  20. 1.818 km NE of West Yellowstone, Montana · 2903 days ago · 9 km deep · 43 km away
  21. 1.518 km NE of West Yellowstone, Montana · 2903 days ago · 9 km deep · 43 km away
  22. 2.772 km ESE of West Yellowstone, Montana · 2902 days ago · 10 km deep · 31 km away · felt by 1
  23. 2.123 km SW of Mammoth, Wyoming · 2901 days ago · 5 km deep · 42 km away
  24. 1.646 km SE of West Yellowstone, Montana · 2899 days ago · 3 km deep · 33 km away
  25. 2.026 km ESE of West Yellowstone, Montana · 2892 days ago · 9 km deep · 27 km away

Before

  1. 2.222 km SSW of Mammoth, Wyoming · 2954 days ago · 5 km deep · 34 km away
  2. 2.423 km SSW of Mammoth, Wyoming · 2955 days ago · 5 km deep · 34 km away
  3. 2.323 km SSW of Mammoth, Wyoming · 2955 days ago · 5 km deep · 34 km away
  4. 1.823 km SSW of Mammoth, Wyoming · 2955 days ago · 5 km deep · 34 km away
  5. 2.047 km ESE of West Yellowstone, Montana · 2958 days ago · 4 km deep · 19 km away
  6. 2.047 km ESE of West Yellowstone, Montana · 2958 days ago · 4 km deep · 20 km away
  7. 1.747 km ESE of West Yellowstone, Montana · 2958 days ago · 4 km deep · 20 km away
  8. 1.7Wyoming · 2958 days ago · 4 km deep · 19 km away
  9. 1.647 km ESE of West Yellowstone, Montana · 2958 days ago · 4 km deep · 19 km away
  10. 1.947 km ESE of West Yellowstone, Montana · 2958 days ago · 4 km deep · 19 km away
  11. 1.849 km ESE of West Yellowstone, Montana · 2963 days ago · 6 km deep · 19 km away
  12. 2.128 km NE of Kelly, Wyoming · 2964 days ago · 7 km deep · 92 km away
  13. 1.513 km E of Hebgen Lake Estates, Montana · 2967 days ago · 10 km deep · 50 km away
  14. 1.6Idaho-Montana border region · 2967 days ago · 10 km deep · 50 km away
  15. 1.845 km ENE of Warm River, Idaho · 2968 days ago · 7 km deep · 49 km away
  16. 1.717 km ENE of Hebgen Lake Estates, Montana · 2974 days ago · 11 km deep · 49 km away
  17. 2.127 km NE of Kelly, Wyoming · 2976 days ago · 12 km deep · 93 km away
  18. 2.536 km S of Silver Gate, Montana · 2977 days ago · 15 km deep · 32 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60295342. Read Thu, Oct 1, 2026, 10:45 AM UTC.