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]
^ abcdCite error: The named reference PAGER-CAT was invoked but never defined (see the help page).
^ abCite error: The named reference NGDC was invoked but never defined (see the help page).
^Kanamori, H.; Abe, K. (1979). "Reevaluation of the Turn-of-the-Century Seismicity Peak" (PDF). Journal of Geophysical Research. 84 (B11): 6134. Bibcode:1979JGR....84.6131K. doi:10.1029/JB084iB11p06131.
^ abKaabouben F.; Brahim A.I.; Toto E.; Baptista M.A.; Miranda J.M.; Soares P.; Luis J.F. (2008). "On the focal mechanism of the 26.05.1975 North Atlantic event contribution from tsunami modeling" (PDF). Journal of Seismology. 12 (4): 575–583. Bibcode:2008JSeis..12..575K. doi:10.1007/s10950-008-9110-6. S2CID 54881674.
^Lynnes C.S.; Ruff L.J. (1985). "Source process and tectonic implications of the great 1975 North Atlantic earthquake" (PDF). Geophysical Journal of the Royal Astronomical Society. 82 (3): 497–510. Bibcode:1985GeoJ...82..497L. doi:10.1111/j.1365-246X.1985.tb05148.x. hdl:2027.42/72996.
^USGS (October 20, 2012). "Earthquake History for May 26th". Today in Earthquake History. United States Geological Survey. Retrieved February 22, 2013.
^Abreu U.; Tavares A.O.; Rodrigues D. "Processos de perigosidade natural no Município de Câmara de Lobos – Madeira, contributo para a gestão do risco e de emergência" (PDF) (in Portuguese). pp. 53–71. Retrieved February 22, 2013.
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