Montana earthquakes in 1975
35 earthquakes of magnitude 2.5 or more were located in Montana in 1975. The largest: M5.9 26 km SSE of Mammoth, Wyoming, Jun 30, 1975.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1975 was located in Montana. Select one for its page.
Every quake of 1975
Magnitude 2.5 and up, newest first.
- 2.835 km NE of Seeley Lake, Montana · 10 km deep
- 2.731 km NE of Seeley Lake, Montana · 10 km deep
- 3.49 km SW of Logan, Montana · 19 km deep
- 4.32 km S of Evergreen, Montana · 25 km deep
- 3.98 km ENE of Froid, Montana · 5 km deep
- 3.54 km NW of Helena Valley West Central, Montana · 5 km deep
- 3.15 km WNW of Helena Valley West Central, Montana · 5 km deep
- 3.94 km W of Helena Valley Northwest, Montana · 5 km deep
- 3.830 km S of Mammoth, Wyoming · 5 km deep
- 3.729 km E of West Yellowstone, Montana · 5 km deep
- 3.626 km SSE of Mammoth, Wyoming · 5 km deep
- 3.524 km SSE of Mammoth, Wyoming · 5 km deep
- 4.529 km SSE of Mammoth, Wyoming · 5 km deep
- 4.531 km SE of Mammoth, Wyoming · 5 km deep
- 4.230 km SSE of Mammoth, Wyoming · 5 km deep
- 4.621 km SSW of Mammoth, Wyoming · 5 km deep
- 3.420 km S of Mammoth, Wyoming · 5 km deep
- 4.814 km SE of Mammoth, Wyoming · 5 km deep
- 3.16 km ESE of Jardine, Montana · 5 km deep
- 3.43 km W of Gardiner, Montana · 5 km deep
- 4.932 km SSE of Mammoth, Wyoming · 5 km deep
- 4.732 km SSE of Mammoth, Wyoming · 5 km deep
- 4.26 km SSE of Mammoth, Wyoming · 5 km deep
- 5.123 km S of Mammoth, Wyoming · 5 km deep
- 5.926 km SSE of Mammoth, Wyoming · 7 km deep
- 4.623 km SSE of Mammoth, Wyoming · 5 km deep
- 3.524 km SSE of Mammoth, Wyoming · 5 km deep
- 3.76 km S of Townsend, Montana · 5 km deep
- 3.90 km NE of Toston, Montana · 5 km deep
- 3.832 km ENE of Leadore, Idaho · 5 km deep
- 4.09 km SSE of Ponderosa Pines, Montana · 5 km deep
- 4.612 km E of Evergreen, Montana · 8 km deep
- 4.110 km NE of Forest Hill Village, Montana · 5 km deep
- 4.225 km SSW of Big Sky, Montana · 5 km deep
- 4.413 km NNW of Old Agency, Montana · 5 km deep
The largest
The 25 largest of 1975 in Montana.
- 5.926 km SSE of Mammoth, Wyoming · 7 km deep
- 5.123 km S of Mammoth, Wyoming · 5 km deep
- 4.932 km SSE of Mammoth, Wyoming · 5 km deep
- 4.814 km SE of Mammoth, Wyoming · 5 km deep
- 4.732 km SSE of Mammoth, Wyoming · 5 km deep
- 4.621 km SSW of Mammoth, Wyoming · 5 km deep
- 4.623 km SSE of Mammoth, Wyoming · 5 km deep
- 4.612 km E of Evergreen, Montana · 8 km deep
- 4.529 km SSE of Mammoth, Wyoming · 5 km deep
- 4.531 km SE of Mammoth, Wyoming · 5 km deep
- 4.413 km NNW of Old Agency, Montana · 5 km deep
- 4.32 km S of Evergreen, Montana · 25 km deep
- 4.230 km SSE of Mammoth, Wyoming · 5 km deep
- 4.26 km SSE of Mammoth, Wyoming · 5 km deep
- 4.225 km SSW of Big Sky, Montana · 5 km deep
- 4.110 km NE of Forest Hill Village, Montana · 5 km deep
- 4.09 km SSE of Ponderosa Pines, Montana · 5 km deep
- 3.94 km W of Helena Valley Northwest, Montana · 5 km deep
- 3.90 km NE of Toston, Montana · 5 km deep
- 3.98 km ENE of Froid, Montana · 5 km deep
- 3.830 km S of Mammoth, Wyoming · 5 km deep
- 3.832 km ENE of Leadore, Idaho · 5 km deep
- 3.729 km E of West Yellowstone, Montana · 5 km deep
- 3.76 km S of Townsend, Montana · 5 km deep
- 3.626 km SSE of Mammoth, Wyoming · 5 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1975 | 3 | 4.4 | 13 km NNW of Old Agency, Montana |
| February 1975 | 2 | 4.6 | 12 km E of Evergreen, Montana |
| March 1975 | 0 | ||
| April 1975 | 1 | 3.8 | 32 km ENE of Leadore, Idaho |
| May 1975 | 2 | 3.9 | 0 km NE of Toston, Montana |
| June 1975 | 9 | 5.9 | 26 km SSE of Mammoth, Wyoming |
| July 1975 | 13 | 4.8 | 14 km SE of Mammoth, Wyoming |
| August 1975 | 0 | ||
| September 1975 | 1 | 3.9 | 8 km ENE of Froid, Montana |
| October 1975 | 1 | 4.3 | 2 km S of Evergreen, Montana |
| November 1975 | 1 | 3.4 | 9 km SW of Logan, Montana |
| December 1975 | 2 | 2.8 | 35 km NE of Seeley Lake, Montana |
What this means
The catalog is only as complete as the instruments of the time. Worldwide coverage of magnitude 5 and up dates from the 1960s, and of 4.5 from the 1990s; earlier years hold the large quakes and the ones near a station, so a low count in an early year means fewer instruments, not a quiet earth.
By year
Every year the USGS catalog covers.
- 2020s2020202120222023202420252026
- 2010s2010201120122013201420152016201720182019
- 2000s2000200120022003200420052006200720082009
- 1990s1990199119921993199419951996199719981999
- 1980s1980198119821983198419851986198719881989
- 1970s1970197119721973197419751976197719781979
- 1960s1960196119621963196419651966196719681969
- 1950s1950195119521953195419551956195719581959
- 1940s1940194119421943194419451946194719481949
- 1930s1930193119321933193419351936193719381939
- 1920s1920192119221923192419251926192719281929
- 1910s1910191119121913191419151916191719181919
- 1900s1900190119021903190419051906190719081909
Nearby
Sources
Earthquakes, magnitudes, depths, shaking estimates and felt reports from the U.S. Geological Survey Earthquake Hazards Program, read from its live feeds and its catalog back to 1900. Tsunami messages from NOAA’s tsunami warning centers.