M 4.6 earthquake: South Pacific Ocean (Tonga) — March 21, 1973

M 4.6 earthquake: South Pacific Ocean (Tonga) — March 21, 1973. Epicenter 282 km N of Neiafu, depth 86 km, 22:13 Local (1973-03-21 09:13 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

South Pacific Ocean (282 km N, Tonga) — -16.132, -173.703

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