M 5.1 earthquake: South Pacific Ocean (Tonga) — July 18, 1977

M 5.1 earthquake: South Pacific Ocean (Tonga) — July 18, 1977. Epicenter 363 km W of Nuku'alofa, depth 585 km, 18:36 Local (1977-07-19 06:36 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (363 km W, Tonga) — -21.834, -178.644

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