1974 Lesser Antilles earthquake
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The 1974 Lesser Antilles earthquake occurred at on October 8 with a moment magnitude of 6.9 and a maximum Mercalli intensity of VIII (''Severe''). Four people were injured in what the United States'
National Geophysical Data Center The United States National Geophysical Data Center (NGDC) provided scientific stewardship, products and services for geophysical data describing the solid earth, marine, and solar-terrestrial environment, as well as earth observations from spac ...
called a moderately destructive event.


Tectonic setting

While the northern and southern boundary of the
Caribbean Plate The Caribbean Plate is a mostly oceanic tectonic plate underlying Central America and the Caribbean Sea off the north coast of South America. Roughly 3.2 million square kilometers (1.2 million square miles) in area, the Caribbean Plate borders ...
are complex and diffuse, with zones of seismicity stretching several hundred kilometers across, the eastern boundary is that of the Lesser Antilles subduction zone. This long
subduction zone Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...
lacks a uniform curve and has an average dip of 50–60°. The largest known earthquake on the plate interface was a M7.5–8.0 event in 1843, but it did not generate a large tsunami. In opposition, the three largest events between 1950 and 1978 were intraplate normal faulting events.


See also

*
Lesser Antilles The Lesser Antilles ( es, link=no, Antillas Menores; french: link=no, Petites Antilles; pap, Antias Menor; nl, Kleine Antillen) are a group of islands in the Caribbean Sea. Most of them are part of a long, partially volcanic island arc betwe ...
*
List of earthquakes in 1974 This is a list of earthquakes in 1974. Only magnitude 6.0 or greater earthquakes appear on the list. Lower magnitude events are included if they have caused death, injury or damage. Events which occurred in remote areas will be excluded from the ...
*
List of earthquakes in the Caribbean Major earthquakes in the Caribbean are infrequent and are sometimes accompanied by tsunami. Earthquakes See also *List of earthquakes in Cuba *List of earthquakes in the Dominican Republic *List of earthquakes in Haiti *List of earthquakes in ...


References

Sources *


External links


Antigua & Barbuda remembers ’74 quake
– ''The Daily Observer'' * {{Earthquakes in the Caribbean 1974 earthquakes 1974 in the Caribbean Earthquakes in Antigua and Barbuda