M 5.7 earthquake: South Pacific Ocean (Tonga) — August 21, 1975

M 5.7 earthquake: South Pacific Ocean (Tonga) — August 21, 1975. Epicenter 339 km W of Nuku'alofa, depth 559 km, 08:18 Local (1975-08-20 20:18 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (339 km W, Tonga) — -20.399, -178.385

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