M 4.5 earthquake: South Pacific Ocean (Tonga) — March 20, 1977

M 4.5 earthquake: South Pacific Ocean (Tonga) — March 20, 1977. Epicenter 267 km W of Nuku'alofa, depth 543 km, 05:12 Local (1977-03-19 16:12 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (267 km W, Tonga) — -20.485, -177.697

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