1983 Chagos Archipelago earthquake
6°51′S 72°07′E / 6.85°S 72.11°E / -6.85; 72.11Max. intensity MMI VI (Strong)
The 1983 Chagos Archipelago earthquake occurred on November 30 at 17:46 UTC (23:46 local time) in the region of the Chagos Archipelago, British Indian Ocean Territory. This earthquake had a moment magnitude and surface wave magnitude of 7.7.[1] This earthquake occurred in the Indian Plate near the Central Indian Ridge. The Central Indian Ridge is unusually active in near-ridge earthquakes. The intense seismic activity in this region may indicate an early stage of converging plate boundary, which is responsible for the N-S extension near Chagos. There was a 40 cm tsunami reported in Victoria, Seychelles.[2][3]
References
- ^ ISC (2022), ISC-GEM Global Instrumental Earthquake Catalogue (1904–2018), Version 9.1, International Seismological Centre, doi:10.31905/D808B825
- ^ "Archived copy" (PDF). Archived from the original (PDF) on 2011-06-14. Retrieved 2010-10-16.
{{cite web}}
: CS1 maint: archived copy as title (link) - ^ "Significant Earthquakes of the World". Archived from the original on 2009-12-04.
External links
- The International Seismological Centre has a bibliography and/or authoritative data for this event.
- v
- t
- e
- 1983 Popayán (5.5, March 31)
- Coalinga (6.5, May 2)
- Noshiro (7.8, May 26) †
- Biga (6.1, July 5)
- Luzon (6.5, August 17)
- Kopaonik (5.3, September 10)
- Borah Peak (6.9, October 28)
- Erzurum (6.9, October 30) † ‡
- Heze (5.7, November 7) †
- Kaoiki (6.7, November 16)
- Chagos Archipelago (7.7, November 30)
- Hindu Kush (7.4, December 30)
- Liège (4.7, November 8)
† indicates earthquake resulting in at least 30 deaths
‡ indicates the deadliest earthquake of the year
‡ indicates the deadliest earthquake of the year