M 5.5 earthquake: North Atlantic Ocean (Portugal) — May 4, 1987

M 5.5 earthquake: North Atlantic Ocean (Portugal) — May 4, 1987. Epicenter 304 km W of Horta, depth 10 km, 21:48 Local (1987-05-04 23:48 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Atlantic Ocean (304 km W, Portugal) — 37.618, -31.913

EarthquakeLive.org