The 1975 North Atlantic earthquake occurred on May 26 at 09:11 UTC. The epicenter was located in the North
Atlantic, in an area between the
Azores,
Iberian Peninsula, and
Morocco. It had a magnitude of
Mw 7.9, or
Ms 8.1.[3]
This was an
intraplate earthquake that was located about 200 km south of the Gloria Fault, the presumed boundary between the
African Plate and the
Eurasia Plate. It had a right-lateral strike-slip
focal mechanism and was unusually large for an oceanic strike-slip event.[4][5] Damage was reported in
Madeira, which is about 250 km away.[6][7] A tsunami of 0.3 m in maximum water elevation was recorded in
Lagos, Portugal and an eyewitness reported a 2 m (6 ft 7 in) wave height at
Ponta Delgada in the
Azores.[4]
^USGS (October 20, 2012).
"Earthquake History for May 26th". Today in Earthquake History. United States Geological Survey. Retrieved February 22, 2013.