M 4.6 earthquake: North Atlantic Ocean (Portugal) — April 21, 1983

M 4.6 earthquake: North Atlantic Ocean (Portugal) — April 21, 1983. Epicenter 1298 km N of Angra do Heroísmo, depth 10 km, 01:27 Local (1983-04-21 03:27 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (1298 km N, Portugal) — 50.227, -29.297

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