M 5.4 earthquake: South Pacific Ocean (Tonga) — October 17, 1978

M 5.4 earthquake: South Pacific Ocean (Tonga) — October 17, 1978. Epicenter 311 km W of Nuku'alofa, depth 550 km, 10:56 Local (1978-10-17 22:56 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (311 km W, Tonga) — -20.63, -178.163

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