Saint Helena earthquakes in 1977
9 earthquakes of magnitude 4.5 or more were located in Saint Helena in 1977. The largest: M5.5 Tristan da Cunha region, Oct 14, 1977.
From the USGS catalog. Times are local to each quake.
Map
Where every quake of 1977 was located in Saint Helena. Select one for its page.
Every quake of 1977
Magnitude 4.5 and up, newest first.
- 5.5Tristan da Cunha region · 33 km deep
- 5.1north of Ascension Island · 33 km deep
- 5.3north of Ascension Island · 33 km deep
- 4.7122 km NE of Georgetown, Saint Helena · 33 km deep
- 5.0Ascension Island region · 33 km deep
- 5.3north of Ascension Island · 33 km deep
- 4.8north of Ascension Island · 33 km deep
- 5.5Ascension Island region · 33 km deep
- 5.0Tristan da Cunha region · 33 km deep
Month by month
Counted by UTC date, which is how the catalog files them.
| Month | Quakes | Largest | Where |
|---|---|---|---|
| January 1977 | 1 | 5.0 | Tristan da Cunha region |
| February 1977 | 1 | 5.5 | Ascension Island region |
| March 1977 | 2 | 5.3 | north of Ascension Island |
| April 1977 | 1 | 5.0 | Ascension Island region |
| May 1977 | 1 | 4.7 | 122 km NE of Georgetown, Saint Helena |
| June 1977 | 0 | ||
| July 1977 | 2 | 5.3 | north of Ascension Island |
| August 1977 | 0 | ||
| September 1977 | 0 | ||
| October 1977 | 1 | 5.5 | Tristan da Cunha region |
| November 1977 | 0 | ||
| December 1977 | 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.