1975 North Atlantic earthquake

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1975 North Atlantic earthquake
Date 26 May 1975 (1975-05-26)
Origin time 9:11 UTC [1]
Magnitude Mw 7.9 [1]
Depth 33 km (21 mi) [1]
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Type Strike-slip
Total damage Limited [2]
Max. intensity VI (Strong) [2]
Tsunami 2.1 m (6 ft 11 in) [1]

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]

References

  1. 1.0 1.1 1.2 1.3 1.4 USGS (September 4, 2009), PAGER-CAT Earthquake Catalog, Version 2008_06.1, United States Geological Survey<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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  6. USGS (October 20, 2012). "Earthquake History for May 26th". Today in Earthquake History. United States Geological Survey. Retrieved February 22, 2013.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. 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. <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>