M 4.6 earthquake: North Atlantic Ocean (Portugal) — April 21, 1988

M 4.6 earthquake: North Atlantic Ocean (Portugal) — April 21, 1988. Epicenter 960 km N of Angra do Heroísmo, depth 10 km, 23:53 Local (1988-04-22 01:53 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (960 km N, Portugal) — 47.283, -27.372

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