M 5.5 earthquake: North Atlantic Ocean (Portugal) — December 4, 1990

M 5.5 earthquake: North Atlantic Ocean (Portugal) — December 4, 1990. Epicenter 578 km N of Horta, depth 16 km, 07:12 Local (1990-12-04 09:12 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (578 km N, Portugal) — 43.729, -28.864

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