1975 North Atlantic earthquake explained
| 1975 North Atlantic earthquake |
| Timestamp: | 1975-05-26 09:11:51 |
| Isc-Event: | 729431 |
| Anss-Url: | iscgem729431 |
| Local-Time: | 10:11:51 |
| Magnitude: | 7.9
8.1 |
| Depth: | 33km (21miles) |
| Type: | Strike-slip |
| Damages: | Limited |
| Tsunami: | 2.1m (06.9feet) |
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.[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.[2] [3] Damage was reported in Madeira, which is about 250 km away.[4] [5] A tsunami of 0.3 m in maximum water elevation was recorded in Lagos, Portugal and an eyewitness reported a 2m (07feet) wave height at Ponta Delgada in the Azores.[2]
See also
Notes and References
- Reevaluation of the Turn-of-the-Century Seismicity Peak. Kanamori. H.. Hiroo Kanamori. Abe. K.. Journal of Geophysical Research. 1979. 84. B11. 6134. 10.1029/JB084iB11p06131. 1979JGR....84.6131K.
- On the focal mechanism of the 26.05.1975 North Atlantic event contribution from tsunami modeling . Kaabouben F. . Brahim A.I. . Toto E. . Baptista M.A. . Miranda J.M. . Soares P. . Luis J.F. . Journal of Seismology . 2008 . 12 . 4 . 575–583 . 10.1007/s10950-008-9110-6. 2008JSeis..12..575K . 54881674 .
- Source process and tectonic implications of the great 1975 North Atlantic earthquake . Lynnes C.S. . Ruff L.J. . Geophysical Journal of the Royal Astronomical Society . 1985 . 82 . 3 . 497–510 . 10.1111/j.1365-246X.1985.tb05148.x. free . 1985GeoJ...82..497L . 2027.42/72996 .
- Web site: Earthquake History for May 26th . United States Geological Survey . Today in Earthquake History . October 20, 2012 . February 22, 2013 . USGS.
- Web site: Processos de perigosidade natural no Município de Câmara de Lobos – Madeira, contributo para a gestão do risco e de emergência . February 22, 2013 . Abreu U. . Tavares A.O. . Rodrigues D. . Portuguese. 53–71.
