Montana earthquakes

M1.8 earthquake 30 km SSE of Mammoth, Wyoming

A magnitude 1.8 earthquake struck 30 km SSE of Mammoth, Wyoming on Fri, Mar 20, 2015, 7:39 AM MDT (13:39 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.0 50 km SSE 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
1.8 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2015-03-20 13:39:46 UTC
Depth
4.9 km (3.1 mi), shallow
Epicenter
44.724° N, 110.542° 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 1.1 km horizontally, 0.5 km in depth
Magnitude uncertainty
±0.41
Depth from
FROM_LOCATION
Station coverage gap
170°
Stations used
7

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 13 in the 30 days before it.

After

  1. 1.655 km SE of West Yellowstone, Montana · 4215 days ago · 4 km deep · 46 km away
  2. 2.017 km ENE of Hebgen Lake Estates, Montana · 4215 days ago · 8 km deep · 36 km away
  3. 2.029 km SSE of Mammoth, Wyoming · 4214 days ago · 4 km deep · 2 km away
  4. 2.227 km SSE of Mammoth, Wyoming · 4214 days ago · 7 km deep · 3 km away
  5. 1.628 km SSE of Mammoth, Wyoming · 4213 days ago · 7 km deep · 3 km away
  6. 1.949 km ESE of West Yellowstone, Montana · 4207 days ago · 2 km deep · 21 km away
  7. 1.825 km WSW of Corwin Springs, Montana · 4204 days ago · 15 km deep · 53 km away
  8. 1.730 km NNE of Alta, Wyoming · 4202 days ago · 10 km deep · 84 km away
  9. 1.65 km ESE of Hebgen Lake Estates, Montana · 4196 days ago · 12 km deep · 46 km away
  10. 2.245 km ENE of Warm River, Idaho · 4192 days ago · 7 km deep · 57 km away
  11. 1.545 km ENE of Warm River, Idaho · 4192 days ago · 5 km deep · 58 km away
  12. 2.125 km ESE of West Yellowstone, Montana · 4188 days ago · 6 km deep · 29 km away
  13. 2.029 km ESE of West Yellowstone, Montana · 4187 days ago · 5 km deep · 24 km away
  14. 2.251 km SE of Mammoth, Wyoming · 4179 days ago · 5 km deep · 22 km away
  15. 1.625 km SE of Mammoth, Wyoming · 4177 days ago · 6 km deep · 9 km away
  16. 1.78 km NNW of Big Sky, Montana · 4173 days ago · 11 km deep · 97 km away
  17. 1.5Idaho-Montana border region · 4171 days ago · 8 km deep · 48 km away
  18. 1.74 km SE of Hebgen Lake Estates, Montana · 4171 days ago · 10 km deep · 49 km away
  19. 2.14 km SE of Hebgen Lake Estates, Montana · 4170 days ago · 9 km deep · 49 km away
  20. 2.04 km SE of Hebgen Lake Estates, Montana · 4167 days ago · 10 km deep · 49 km away
  21. 1.635 km E of West Yellowstone, Montana · 4165 days ago · 5 km deep · 15 km away
  22. 1.524 km SSE of West Yellowstone, Montana · 4163 days ago · 6 km deep · 43 km away
  23. 1.74 km SE of Hebgen Lake Estates, Montana · 4163 days ago · 10 km deep · 49 km away
  24. 3.050 km SSE of Mammoth, Wyoming · 4157 days ago · 4 km deep · 20 km away · felt by 8
  25. 2.250 km SSE of Mammoth, Wyoming · 4157 days ago · 5 km deep · 20 km away

Before

  1. 1.630 km NNE of Alta, Wyoming · 4221 days ago · 8 km deep · 84 km away
  2. 1.953 km SSE of Mammoth, Wyoming · 4223 days ago · 4 km deep · 23 km away
  3. 1.51 km SW of Hebgen Lake Estates, Montana · 4226 days ago · 12 km deep · 52 km away
  4. 1.734 km SE of West Yellowstone, Montana · 4229 days ago · 2 km deep · 42 km away
  5. 1.635 km SSE of West Yellowstone, Montana · 4229 days ago · 2 km deep · 48 km away
  6. 1.941 km SSE of Mammoth, Wyoming · 4232 days ago · 4 km deep · 12 km away
  7. 2.023 km WNW of Hebgen Lake Estates, Montana · 4233 days ago · 5 km deep · 74 km away
  8. 1.930 km ESE of West Yellowstone, Montana · 4234 days ago · 7 km deep · 24 km away
  9. 1.94 km SE of Hebgen Lake Estates, Montana · 4236 days ago · 9 km deep · 48 km away
  10. 2.014 km ENE of Hebgen Lake Estates, Montana · 4244 days ago · 5 km deep · 38 km away
  11. 2.414 km ENE of Hebgen Lake Estates, Montana · 4244 days ago · 5 km deep · 38 km away
  12. 1.832 km ESE of West Yellowstone, Montana · 4244 days ago · 6 km deep · 23 km away
  13. 2.314 km ENE of Hebgen Lake Estates, Montana · 4245 days ago · 6 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60105022. Read Sun, Oct 4, 2026, 11:35 PM UTC.