M 4.5 earthquake: North Atlantic Ocean (Portugal) — January 31, 1991

M 4.5 earthquake: North Atlantic Ocean (Portugal) — January 31, 1991. Epicenter 689 km N of Angra do Heroísmo, depth 10 km, 20:43 Local (1991-01-31 22:43 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (689 km N, Portugal) — 44.812, -28.051

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