Saint Helena earthquakes in 1975
11 earthquakes of magnitude 4.5 or more were located in Saint Helena in 1975. The largest: M6.1 Ascension Island region, Sep 24, 1975.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1975 was located in Saint Helena. Select one for its page.
Every quake of 1975
Magnitude 4.5 and up, newest first.
- 5.0north of Ascension Island · 33 km deep
- 4.6273 km ENE of Georgetown, Saint Helena · 33 km deep
- 6.1Ascension Island region · 33 km deep
- 4.8Ascension Island region · 33 km deep
- 5.0north of Ascension Island · 33 km deep
- 4.8north of Ascension Island · 33 km deep
- 5.3north of Ascension Island · 10 km deep
- 4.9167 km ENE of Georgetown, Saint Helena · 33 km deep
- 4.6north of Ascension Island · 33 km deep
- 4.9Tristan da Cunha region · 33 km deep
- 5.0north 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 1975 | 1 | 5.0 | north of Ascension Island |
| February 1975 | 1 | 4.9 | Tristan da Cunha region |
| March 1975 | 0 | ||
| April 1975 | 1 | 4.6 | north of Ascension Island |
| May 1975 | 1 | 4.9 | 167 km ENE of Georgetown, Saint Helena |
| June 1975 | 0 | ||
| July 1975 | 3 | 5.3 | north of Ascension Island |
| August 1975 | 0 | ||
| September 1975 | 3 | 6.1 | Ascension Island region |
| October 1975 | 0 | ||
| November 1975 | 1 | 5.0 | north of Ascension Island |
| December 1975 | 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.