Montana earthquakes

M1.7 earthquake 50 km SSE of Mammoth, Wyoming

A magnitude 1.7 earthquake struck 50 km SSE of Mammoth, Wyoming on Wed, Apr 20, 2016, 9:59 AM MDT (15:59 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M2.5 10 km NE of West Yellowstone, Montana. 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
1.7 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2016-04-20 15:59:09 UTC
Depth
2.0 km (1.3 mi), shallow
Epicenter
44.581° N, 110.393° 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, 1.1 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
78°
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: 16 in the 60 days after this one and 17 in the 30 days before it.

After

  1. 1.651 km SSE of Mammoth, Wyoming · 3816 days ago · 3 km deep · 1 km away
  2. 1.820 km S of Mammoth, Wyoming · 3813 days ago · 4 km deep · 33 km away
  3. 2.020 km S of Mammoth, Wyoming · 3813 days ago · 4 km deep · 33 km away
  4. 1.819 km S of Mammoth, Wyoming · 3813 days ago · 4 km deep · 34 km away
  5. 1.619 km S of Mammoth, Wyoming · 3813 days ago · 4 km deep · 34 km away
  6. 1.955 km SE of West Yellowstone, Montana · 3813 days ago · 2 km deep · 34 km away
  7. 1.649 km SE of Mammoth, Wyoming · 3794 days ago · 3 km deep · 6 km away
  8. 2.45 km SW of Hebgen Lake Estates, Montana · 3790 days ago · 12 km deep · 69 km away
  9. 1.760 km ESE of West Yellowstone, Montana · 3788 days ago · 3 km deep · 18 km away
  10. 2.510 km NE of West Yellowstone, Montana · 3779 days ago · 8 km deep · 52 km away
  11. 1.811 km NE of West Yellowstone, Montana · 3779 days ago · 9 km deep · 52 km away
  12. 1.640 km S of Silver Gate, Montana · 3769 days ago · 10 km deep · 32 km away
  13. 2.061 km NNE of Kelly, Wyoming · 3764 days ago · 11 km deep · 54 km away
  14. 2.043 km SE of West Yellowstone, Montana · 3762 days ago · 2 km deep · 37 km away
  15. 1.620 km SSW of Mammoth, Wyoming · 3761 days ago · 2 km deep · 41 km away
  16. 2.146 km ENE of Warm River, Idaho · 3757 days ago · 10 km deep · 47 km away

Before

  1. 2.28 km ENE of Alta, Wyoming · 3818 days ago · 10 km deep · 99 km away
  2. 1.98 km ENE of Alta, Wyoming · 3818 days ago · 5 km deep · 100 km away
  3. 1.68 km ENE of Alta, Wyoming · 3818 days ago · 4 km deep · 99 km away
  4. 1.639 km SSE of Mammoth, Wyoming · 3818 days ago · 5 km deep · 11 km away
  5. 1.561 km ESE of West Yellowstone, Montana · 3820 days ago · 7 km deep · 20 km away
  6. 1.624 km SSW of Mammoth, Wyoming · 3826 days ago · 4 km deep · 40 km away
  7. 1.61 km NNW of Hebgen Lake Estates, Montana · 3827 days ago · 15 km deep · 67 km away
  8. 2.242 km SSE of Mammoth, Wyoming · 3838 days ago · 4 km deep · 8 km away
  9. 1.646 km SSE of Mammoth, Wyoming · 3841 days ago · 5 km deep · 4 km away
  10. 2.320 km SSE of Mammoth, Wyoming · 3842 days ago · 10 km deep · 30 km away
  11. 1.920 km SSE of Mammoth, Wyoming · 3843 days ago · 7 km deep · 30 km away
  12. 1.721 km SSE of Mammoth, Wyoming · 3843 days ago · 5 km deep · 29 km away
  13. 1.517 km SE of West Yellowstone, Montana · 3843 days ago · 10 km deep · 45 km away
  14. 1.816 km SE of West Yellowstone, Montana · 3843 days ago · 8 km deep · 46 km away
  15. 1.617 km SE of West Yellowstone, Montana · 3843 days ago · 8 km deep · 45 km away
  16. 1.613 km E of Alta, Wyoming · 3845 days ago · 7 km deep · 99 km away
  17. 1.937 km S of Silver Gate, Montana · 3846 days ago · 13 km deep · 33 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60145942. Read Fri, Oct 2, 2026, 6:32 AM UTC.