M 4.6 earthquake: North Pacific Ocean (USA) — October 20, 1983

M 4.6 earthquake: North Pacific Ocean (USA) — October 20, 1983. Epicenter 336 km W of Atka, depth 56 km, 00:12 Local (1983-10-20 12:12 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (336 km W, USA) — 50.971, -178.653

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