1983 Chagos Archipelago earthquake

1983 Chagos Archipelago earthquake 1983 11 30 1983-11-30 17:46:00 23:46 usp000205u 565767 Indian Ocean 7.7 w y7.7 s y 10 km mi on 6.85 S 72.11 E VI 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.ISC-GEM Global Instrumental Earthquake Catalogue (1904–2018) http://www.isc.ac.uk/iscgem/index.php ISC 2022 International Seismological Centre Version 9.1 10.31905/D808B825 free 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.http://www.gps.caltech.edu/uploads/File/People/kanamori/HKjgr88b.pdf Archived copy 2010-10-16 dead https://web.archive.org/web/20110614090231/http://www.gps.caltech.edu/uploads/File/People/kanamori/HKjgr88b.pdf 2011-06-14 https://earthquake.usgs.gov/earthquakes/eqarchives/significant/sig_1983.php dead https://web.archive.org/web/20091204220625/http://earthquake.usgs.gov/earthquakes/eqarchives/significant/sig_1983.php 2009-12-04 Significant Earthquakes of the World References External links 565767 Category:Earthquakes in Asia Chagos Archipelago Earthquake, 1983 Category:Chagos Archipelago Category:1980s tsunamis Category:1983 in Seychelles