1983 Chagos Archipelago earthquake
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  | |
| UTC time | 1983-11-30 17:46:00 |
|---|---|
| ISC event | 565767 |
| USGS-ANSS | ComCat |
| Local date | November 30, 1983 |
| Local time | 23:46 |
| Magnitude | 7.7 Mw 7.7 Ms |
| Depth | 10 km (6.2 mi) |
| Epicenter | 6°51′S 72°07′E / 6.85°S 72.11°E |
| Max. 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]