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1975 North Atlantic earthquake

FieldValue
title1975 North Atlantic earthquake
timestamp1975-05-26 09:11:51
isc-event729431
anss-urliscgem729431
local-date
local-time10:11:51
map2{{Location mapNorth Atlantic
lat35.97
long-17.65
markBullseye1.png
marksize40
positiontop
width260
floatright
reliefyes}}
magnitude7.9
8.1
depth33 km
location
typeStrike-slip
damagesLimited
intensity
tsunami2.1 m

|isc-event = 729431 |anss-url = iscgem729431 |local-date = |local-time = 10:11:51 8.1

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.

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. Damage was reported in Madeira, which is about 250 km away. A tsunami of 0.3 m in maximum water elevation was recorded in Lagos, Portugal and an eyewitness reported a 2 m wave height at Ponta Delgada in the Azores.

References

References

  1. (1979). "Reevaluation of the Turn-of-the-Century Seismicity Peak". Journal of Geophysical Research.
  2. (2008). "On the focal mechanism of the 26.05.1975 North Atlantic event contribution from tsunami modeling". Journal of Seismology.
  3. (1985). "Source process and tectonic implications of the great 1975 North Atlantic earthquake". Geophysical Journal of the Royal Astronomical Society.
  4. (October 20, 2012). "Earthquake History for May 26th". United States Geological Survey.
  5. "Processos de perigosidade natural no Município de Câmara de Lobos – Madeira, contributo para a gestão do risco e de emergência".
  6. National Geophysical Data Center / World Data Service (NGDC/WDS). (1972). "Significant Earthquake Database". [[National Geophysical Data Center]], [[National Oceanic and Atmospheric Administration.
  7. (September 4, 2009). "PAGER-CAT Earthquake Catalog". United States Geological Survey.
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