1974 Lesser Antilles earthquake
   | |
| UTC time | 1974-10-08 09:50:58 |
|---|---|
| ISC event | 736214 |
| USGS-ANSS | ComCat |
| Local date | October 8, 1974 |
| Local time | 05:50:58 |
| Magnitude | 6.9 Mw[1] |
| Depth | 35.2 km (22 mi)[1] |
| Epicenter | 17°18′N 62°00′W / 17.3°N 62.0°W[1] |
| Type | Normal[2] |
| Total damage | Moderate[3] |
| Max. intensity | MMI VIII (Severe)[3] |
| Casualties | 4 injured [4] |
The 1974 Lesser Antilles earthquake occurred at 05:50:58 local time 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 called a moderately destructive event.
Tectonic setting
While the northern and southern boundary of the
subduction zone 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.[5]
See also
References
- ^ a b c ISC (2017), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2013), Version 4.0, International Seismological Centre
- ^ McCann, W. R.; Dewey, J. W.; Murphy, A. J.; Harding, S. T. (1982), "A large normal-fault earthquake in the overriding wedge of the Lesser Antilles subduction zone: The earthquake of 8 October 1974" (PDF), Bulletin of the Seismological Society of America, 72 (6A): 2267–2283
- ^ doi:10.7289/V5TD9V7K
- ^ USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey
- ISBN 978-0521190855
Sources
- Tomblin, J. F.; Aspinall, W. P. (1975), "Reconnaissance report of the Antigua, West Indies, earthquake of October 8, 1974", Bulletin of the Seismological Society of America, 65 (6): 1553–1573, S2CID 130249609
External links
- Antigua & Barbuda remembers ’74 quake – The Daily Observer
- The International Seismological Centre has a bibliography and/or authoritative data for this event.