M 4.5 earthquake: South Pacific Ocean (Tonga) — May 21, 1978

M 4.5 earthquake: South Pacific Ocean (Tonga) — May 21, 1978. Epicenter 280 km W of Nuku'alofa, depth 539 km, 19:34 Local (1978-05-21 06:34 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (280 km W, Tonga) — -20.411, -177.799

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