M 4.6 earthquake: South Pacific Ocean (Tonga) — July 18, 1974

M 4.6 earthquake: South Pacific Ocean (Tonga) — July 18, 1974. Epicenter 338 km W of Nuku'alofa, depth 600 km, 11:12 Local (1974-07-18 23:12 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (338 km W, Tonga) — -20.664, -178.432

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