M 4.5 earthquake: South Pacific Ocean (Tonga) — April 21, 1999

M 4.5 earthquake: South Pacific Ocean (Tonga) — April 21, 1999. Epicenter 588 km SW of Nuku'alofa, depth 521 km, 16:40 Local (1999-04-21 04:40 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (588 km SW, Tonga) — -24.026, 179.976

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