M 5.5 earthquake: North Atlantic Ocean (Portugal) — October 23, 1997

M 5.5 earthquake: North Atlantic Ocean (Portugal) — October 23, 1997. Epicenter 868 km N of Angra do Heroísmo, depth 10 km, 12:07 Local (1997-10-23 14:07 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (868 km N, Portugal) — 46.453, -27.505

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