1983 Chagos Archipelago earthquake

6°51′S 72°07′E / 6.85°S 72.11°E / -6.85; 72.11Max. intensityMMI 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

  1. ^ ISC (2022), ISC-GEM Global Instrumental Earthquake Catalogue (1904–2018), Version 9.1, International Seismological Centre, doi:10.31905/D808B825
  2. ^ "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)
  3. ^ "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