Saint Helena earthquakes in 1973
18 earthquakes of magnitude 4.5 or more were located in Saint Helena in 1973. The largest: M5.5 north of Ascension Island, Nov 15, 1973.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1973 was located in Saint Helena. Select one for its page.
Every quake of 1973
Magnitude 4.5 and up, newest first.
- 4.7north of Ascension Island · 33 km deep
- 4.9Ascension Island region · 33 km deep
- 4.8north of Ascension Island · 33 km deep
- 5.5north of Ascension Island · 33 km deep
- 5.2north of Ascension Island · 33 km deep
- 5.0Tristan da Cunha region · 33 km deep
- 5.2195 km ENE of Georgetown, Saint Helena · 33 km deep
- 5.0Tristan da Cunha region · 33 km deep
- 4.8north of Ascension Island · 33 km deep
- 5.3north of Ascension Island · 33 km deep
- 4.7293 km ENE of Georgetown, Saint Helena · 33 km deep
- 4.6Tristan da Cunha region · 33 km deep
- 5.1138 km ENE of Georgetown, Saint Helena · 33 km deep
- 4.7263 km ENE of Georgetown, Saint Helena · 33 km deep
- 4.6north of Ascension Island · 33 km deep
- 4.8Ascension Island region · 33 km deep
- 5.3Ascension Island region · 33 km deep
- 4.7north of Ascension Island · 33 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1973 | 0 | ||
| February 1973 | 5 | 5.3 | Ascension Island region |
| March 1973 | 1 | 5.1 | 138 km ENE of Georgetown, Saint Helena |
| April 1973 | 2 | 4.7 | 293 km ENE of Georgetown, Saint Helena |
| May 1973 | 2 | 5.3 | north of Ascension Island |
| June 1973 | 0 | ||
| July 1973 | 1 | 5.0 | Tristan da Cunha region |
| August 1973 | 0 | ||
| September 1973 | 2 | 5.2 | 195 km ENE of Georgetown, Saint Helena |
| October 1973 | 0 | ||
| November 1973 | 3 | 5.5 | north of Ascension Island |
| December 1973 | 2 | 4.9 | Ascension Island region |
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.