1975 North Atlantic earthquake
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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]
Quick Facts UTC time, ISC event ...
UTC time | 1975-05-26 09:11:51 |
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ISC event | 729431 |
USGS-ANSS | ComCat |
Local date | May 26, 1975 (1975-05-26) |
Local time | 10:11:51 |
Magnitude | 7.9 Mw[1] 8.1 Ms |
Depth | 33 km (21 mi) [1] |
Epicenter | 35.97°N 17.65°W / 35.97; -17.65 [1] |
Type | Strike-slip |
Total damage | Limited [2] |
Max. intensity | MMI VI (Strong)[2] |
Tsunami | 2.1 m (6.9 ft) [1] |
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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]