Saint Helena earthquakes in 1984
14 earthquakes of magnitude 4.5 or more were located in Saint Helena in 1984. The largest: M6.1 north of Ascension Island, Dec 7, 1984.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1984 was located in Saint Helena. Select one for its page.
Every quake of 1984
Magnitude 4.5 and up, newest first.
- 6.1north of Ascension Island · 10 km deep
- 5.6north of Ascension Island · 10 km deep
- 5.2211 km NE of Jamestown, Saint Helena · 10 km deep
- 5.9Ascension Island region · 10 km deep
- 5.2291 km SSE of Georgetown, Saint Helena · 10 km deep
- 5.5229 km ENE of Georgetown, Saint Helena · 10 km deep
- 4.7Tristan da Cunha region · 10 km deep
- 4.7Ascension Island region · 10 km deep
- 5.5204 km ENE of Georgetown, Saint Helena · 10 km deep
- 5.1Ascension Island region · 10 km deep
- 5.0north of Ascension Island · 10 km deep
- 4.8north of Ascension Island · 10 km deep
- 4.5north of Ascension Island · 10 km deep
- 4.7118 km ESE of Georgetown, Saint Helena · 10 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 | 1 | 4.7 | 118 km ESE of Georgetown, Saint Helena |
| March 1984 | 1 | 4.5 | north of Ascension Island |
| April 1984 | 0 | ||
| May 1984 | 2 | 5.0 | north of Ascension Island |
| June 1984 | 1 | 5.1 | Ascension Island region |
| July 1984 | 1 | 5.5 | 204 km ENE of Georgetown, Saint Helena |
| August 1984 | 0 | ||
| September 1984 | 1 | 4.7 | Ascension Island region |
| October 1984 | 2 | 5.5 | 229 km ENE of Georgetown, Saint Helena |
| November 1984 | 2 | 5.9 | Ascension Island region |
| December 1984 | 3 | 6.1 | north of Ascension Island |
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.