M 4.6 earthquake: South Atlantic Ocean (South Georgia and the Islands) — September 15, 1977

M 4.6 earthquake: South Atlantic Ocean (South Georgia and the Islands) — September 15, 1977. Epicenter 621 km SE of Grytviken, depth 102 km, 19:35 Local (1977-09-15 21:35 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Atlantic Ocean (621 km SE, South Georgia and the Islands) — -56.177, -27.29

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