M 4.5 earthquake: South Pacific Ocean (Tonga) — August 20, 1997

M 4.5 earthquake: South Pacific Ocean (Tonga) — August 20, 1997. Epicenter 278 km W of Nuku'alofa, depth 500 km, 05:57 Local (1997-08-19 16:57 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (278 km W, Tonga) — -20.231, -177.715

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