M 4.6 Earthquake: South Pacific Ocean (Tonga) — April 21, 1974

M 4.6 Earthquake: South Pacific Ocean (Tonga) — April 21, 1974. Epicenter 348 km W of Nuku'alofa, depth 667 km, 12:43 Local (1974-04-21 00:43 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (348 km W, Tonga) — -20.058, -178.361

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