M 4.9 Earthquake: South Pacific Ocean (Tonga) — October 18, 1977

M 4.9 Earthquake: South Pacific Ocean (Tonga) — October 18, 1977. Epicenter 621 km SW of Nuku'alofa, depth 531 km, 11:47 Local (1977-10-17 23:47 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (621 km SW, Tonga) — -24.077, 179.633

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