Saint Helena earthquakes in 1985
13 earthquakes of magnitude 4.5 or more were located in Saint Helena in 1985. The largest: M5.5 north of Ascension Island, Feb 27, 1985.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1985 was located in Saint Helena. Select one for its page.
Every quake of 1985
Magnitude 4.5 and up, newest first.
- 5.1Tristan da Cunha region · 10 km deep
- 4.7north of Ascension Island · 10 km deep
- 4.7174 km NE of Georgetown, Saint Helena · 10 km deep
- 4.9289 km SSE of Georgetown, Saint Helena · 10 km deep
- 4.5north of Ascension Island · 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
- 4.8north of Ascension Island · 10 km deep
- 4.8north of Ascension Island · 10 km deep
- 4.7north of Ascension Island · 10 km deep
- 5.4104 km E of Georgetown, Saint Helena · 10 km deep
- 5.5north of Ascension Island · 10 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1985 | 0 | ||
| February 1985 | 1 | 5.5 | north of Ascension Island |
| March 1985 | 0 | ||
| April 1985 | 0 | ||
| May 1985 | 0 | ||
| June 1985 | 3 | 5.4 | 104 km E of Georgetown, Saint Helena |
| July 1985 | 5 | 5.0 | north of Ascension Island |
| August 1985 | 1 | 4.9 | 289 km SSE of Georgetown, Saint Helena |
| September 1985 | 0 | ||
| October 1985 | 2 | 4.7 | north of Ascension Island |
| November 1985 | 1 | 5.1 | Tristan da Cunha region |
| December 1985 | 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.