Montana earthquakes

M4.2 earthquake 30 km SSE of Mammoth, Wyoming

A magnitude 4.2 earthquake struck 30 km SSE of Mammoth, Wyoming on Wed, Jul 2, 1975, 1:54 PM MDT (19:54 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M4.5 31 km SE 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
4.2 (mb), light
Local time
UTC
1975-07-02 19:54:56 UTC
Depth
5.0 km (3.1 mi), shallow
Epicenter
44.719° N, 110.571° 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
21

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 12 in the 30 days before it.

After

  1. 4.531 km SE of Mammoth, Wyoming · 18709 days ago · 5 km deep · 10 km away
  2. 4.529 km SSE of Mammoth, Wyoming · 18707 days ago · 5 km deep · 4 km away
  3. 3.524 km SSE of Mammoth, Wyoming · 18707 days ago · 5 km deep · 7 km away
  4. 3.626 km SSE of Mammoth, Wyoming · 18705 days ago · 5 km deep · 4 km away
  5. 3.729 km E of West Yellowstone, Montana · 18701 days ago · 5 km deep · 14 km away
  6. 3.830 km S of Mammoth, Wyoming · 18699 days ago · 5 km deep · 8 km away

Before

  1. 4.621 km SSW of Mammoth, Wyoming · 18710 days ago · 5 km deep · 16 km away
  2. 3.420 km S of Mammoth, Wyoming · 18711 days ago · 5 km deep · 16 km away
  3. 4.814 km SE of Mammoth, Wyoming · 18711 days ago · 5 km deep · 18 km away
  4. 3.16 km ESE of Jardine, Montana · 18712 days ago · 5 km deep · 36 km away
  5. 3.43 km W of Gardiner, Montana · 18712 days ago · 5 km deep · 37 km away
  6. 4.932 km SSE of Mammoth, Wyoming · 18712 days ago · 5 km deep · 3 km away
  7. 4.732 km SSE of Mammoth, Wyoming · 18712 days ago · 5 km deep · 4 km away
  8. 4.26 km SSE of Mammoth, Wyoming · 18712 days ago · 5 km deep · 24 km away
  9. 5.123 km S of Mammoth, Wyoming · 18712 days ago · 5 km deep · 13 km away
  10. 5.926 km SSE of Mammoth, Wyoming · 18712 days ago · 7 km deep · 4 km away
  11. 4.623 km SSE of Mammoth, Wyoming · 18712 days ago · 5 km deep · 9 km away
  12. 3.524 km SSE of Mammoth, Wyoming · 18712 days ago · 5 km deep · 8 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000bvr. Read Tue, Sep 22, 2026, 10:01 AM UTC.