Illinois earthquakes in 1984
14 earthquakes of magnitude 2.5 or more were located in Illinois in 1984. The largest: M3.8 7 km SE of Harrisburg, Illinois, Jun 29, 1984.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1984 was located in Illinois. Select one for its page.
Every quake of 1984
Magnitude 2.5 and up, newest first.
- 2.86 km SSE of New Grand Chain, Illinois · 5 km deep
- 2.54 km SSE of New Grand Chain, Illinois · 1 km deep
- 2.74 km SE of Willow Hill, Illinois · 10 km deep
- 3.87 km SE of Harrisburg, Illinois · 2 km deep
- 2.63 km SE of Prairie du Rocher, Illinois · 1 km deep
- 3.27 km NE of Sims, Illinois · 14 km deep
- 2.94 km SSE of New Grand Chain, Illinois · 2 km deep
- 3.03 km SSE of New Grand Chain, Illinois · 5 km deep
- 2.54 km S of Grand Chain, Illinois · 2 km deep
- 2.63 km SSE of New Grand Chain, Illinois · 5 km deep
- 3.65 km SSE of New Grand Chain, Illinois · 2 km deep
- 2.54 km SSE of New Grand Chain, Illinois · 1 km deep
- 2.64 km SSE of New Grand Chain, Illinois · 2 km deep
- 3.24 km S of Grand Chain, Illinois · 5 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1984 | 0 | ||
| February 1984 | 7 | 3.6 | 5 km SSE of New Grand Chain, Illinois |
| March 1984 | 1 | 2.9 | 4 km SSE of New Grand Chain, Illinois |
| April 1984 | 1 | 3.2 | 7 km NE of Sims, Illinois |
| May 1984 | 0 | ||
| June 1984 | 2 | 3.8 | 7 km SE of Harrisburg, Illinois |
| July 1984 | 0 | ||
| August 1984 | 1 | 2.7 | 4 km SE of Willow Hill, Illinois |
| September 1984 | 2 | 2.8 | 6 km SSE of New Grand Chain, Illinois |
| October 1984 | 0 | ||
| November 1984 | 0 | ||
| December 1984 | 0 |
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.