Montana earthquakes

M5.1 earthquake 23 km S of Mammoth, Wyoming

A magnitude 5.1 earthquake struck 23 km S of Mammoth, Wyoming on Mon, Jun 30, 1975, 1:00 PM MDT (19:00 UTC), 5 km (3 mi) below the surface.

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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
5.1 (mb), moderate
Local time
UTC
1975-06-30 19:00:27 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
44.766° N, 110.718° 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.

Depth from
OPERATOR_ASSIGNED
Stations used
8

Nearest places

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

Nearby

Within 100 km, magnitude 2.1 and up: 15 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 4.26 km SSE of Mammoth, Wyoming · 18716 days ago · 5 km deep · 18 km away
  2. 4.732 km SSE of Mammoth, Wyoming · 18716 days ago · 5 km deep · 16 km away
  3. 4.932 km SSE of Mammoth, Wyoming · 18716 days ago · 5 km deep · 13 km away
  4. 3.43 km W of Gardiner, Montana · 18716 days ago · 5 km deep · 29 km away
  5. 3.16 km ESE of Jardine, Montana · 18716 days ago · 5 km deep · 33 km away
  6. 4.814 km SE of Mammoth, Wyoming · 18716 days ago · 5 km deep · 17 km away
  7. 3.420 km S of Mammoth, Wyoming · 18716 days ago · 5 km deep · 4 km away
  8. 4.621 km SSW of Mammoth, Wyoming · 18715 days ago · 5 km deep · 4 km away
  9. 4.230 km SSE of Mammoth, Wyoming · 18714 days ago · 5 km deep · 13 km away
  10. 4.531 km SE of Mammoth, Wyoming · 18714 days ago · 5 km deep · 21 km away
  11. 4.529 km SSE of Mammoth, Wyoming · 18711 days ago · 5 km deep · 9 km away
  12. 3.524 km SSE of Mammoth, Wyoming · 18711 days ago · 5 km deep · 7 km away
  13. 3.626 km SSE of Mammoth, Wyoming · 18710 days ago · 5 km deep · 12 km away
  14. 3.729 km E of West Yellowstone, Montana · 18706 days ago · 5 km deep · 7 km away
  15. 3.830 km S of Mammoth, Wyoming · 18704 days ago · 5 km deep · 8 km away

Before

  1. 5.926 km SSE of Mammoth, Wyoming · 18716 days ago · 7 km deep · 9 km away
  2. 4.623 km SSE of Mammoth, Wyoming · 18716 days ago · 5 km deep · 14 km away
  3. 3.524 km SSE of Mammoth, Wyoming · 18716 days ago · 5 km deep · 15 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000bug (also filed as ushis3348). Read Sun, Sep 27, 2026, 5:16 AM UTC.