1983 Chagos Archipelago earthquake is located in Indian Ocean

The 1983 Chagos Archipelago earthquake occurred on November 30, 1983 at 17:46 UTC in the region of the Chagos Archipelago, British Indian Ocean Territory. This earthquake had a magnitude of M_s 7.7. 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]

• http://en.wikipedia.org/wiki/1983 Chagos Archipelago earthquake