M 4.7 earthquake: North Atlantic Ocean (Portugal) — October 17, 1991

M 4.7 earthquake: North Atlantic Ocean (Portugal) — October 17, 1991. Epicenter 1740 km SW of Horta, depth 10 km, 16:36 Local (1991-10-17 19:36 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (1740 km SW, Portugal) — 28.929, -43.548

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