M 4.6 earthquake: South Pacific Ocean (Tonga) — February 1, 1981

M 4.6 earthquake: South Pacific Ocean (Tonga) — February 1, 1981. Epicenter 554 km SW of Nuku'alofa, depth 555 km, 00:37 Local (1981-01-31 12:37 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (554 km SW, Tonga) — -23.359, 179.963

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