Montana earthquakes in 1984
17 earthquakes of magnitude 2.5 or more were located in Montana in 1984. The largest: M4.0 8 km SSW of Toston, Montana, Dec 31, 1983.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1984 was located in Montana. Select one for its page.
Every quake of 1984
Magnitude 2.5 and up, newest first.
- 3.534 km SSE of Virginia City, Montana · 5 km deep
- 3.229 km SSE of Mammoth, Wyoming · 5 km deep
- 3.631 km NW of Lima, Montana · 10 km deep
- 3.233 km SW of Dillon, Montana · 5 km deep
- 3.124 km W of Hebgen Lake Estates, Montana · 5 km deep
- 3.412 km ESE of Swan Lake, Montana · 5 km deep
- 3.010 km SE of Pony, Montana · 5 km deep
- 3.538 km SSE of Virginia City, Montana · 5 km deep
- 3.337 km W of Hebgen Lake Estates, Montana · 5 km deep
- 3.81 km WNW of Toston, Montana · 5 km deep
- 3.24 km WNW of Toston, Montana · 5 km deep
- 3.544 km W of Hebgen Lake Estates, Montana · 5 km deep
- 3.351 km ESE of West Yellowstone, Montana · 5 km deep
- 3.325 km NNW of Neihart, Montana · 5 km deep
- 3.914 km E of Hebgen Lake Estates, Montana · 10 km deep
- 3.834 km SSE of Virginia City, Montana · 5 km deep
- 4.08 km SSW of Toston, Montana · 5 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1984 | 5 | 4.0 | 8 km SSW of Toston, Montana |
| February 1984 | 3 | 3.8 | 1 km WNW of Toston, Montana |
| March 1984 | 2 | 3.5 | 38 km SSE of Virginia City, Montana |
| April 1984 | 1 | 3.0 | 10 km SE of Pony, Montana |
| May 1984 | 1 | 3.4 | 12 km ESE of Swan Lake, Montana |
| June 1984 | 1 | 3.1 | 24 km W of Hebgen Lake Estates, Montana |
| July 1984 | 0 | ||
| August 1984 | 0 | ||
| September 1984 | 2 | 3.6 | 31 km NW of Lima, Montana |
| October 1984 | 1 | 3.2 | 29 km SSE of Mammoth, Wyoming |
| November 1984 | 0 | ||
| December 1984 | 1 | 3.5 | 34 km SSE of Virginia City, 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.