November 25, 1941 Earthquake: Northern, Atlantic Ocean
A magnitude 7.8 earthquake struck Northern, Atlantic Ocean on November 25, 1941 at 18:03:57 UTC, 10 km below the surface. It caused a tsunami.
Map
Where it struck, with the other significant earthquakes within 200 km. Circles are sized and colored by magnitude; select one for its page.
The earthquake
- Date
- November 25, 1941
- Time
- 18:03:57 UTC
- Place
- Northern, Atlantic Ocean
- Magnitude
- 7.8 (Mw)
- Focal depth
- 10 km (6 mi)
- Intensity
- 9 on the Modified Mercalli scale
- Tsunami
- Yes: the tsunami it caused
- Epicenter
- 37.301° N, 18.966° W
- Country
- Atlantic Ocean
The toll
The record gives no deaths, injuries or damage for this earthquake.
What the record says
NCEI’s account, from the sources it cites.
November 25, 1941, 18:03:55 UTC, 37.5 N, 18.5 W, magnitude 8.4 MS. (reference #88)
November 25, 1941, 18:03:55 UTC, 37.5 N, 18.5 W, magnitude 8.3 MS. (reference #130)
November 25, 1941, 18:03:55 UTC, 37deg25min N, 19deg1min W, magnitude 8.2 MS, intensity IX. (reference #1193)
November 25, 1941, North Atlantic, magnitude 8.3 MS. (reference #1314)
November 25, 1941, 18:03:55 UTC, 37.5 N, 18.5 W, magnitude 8.2, intensity VII. (reference #1004)
November 25, 1941, 18:03:57.5 UTC, 37.301 N, 18.966 W, depth 10 km, magnitude 7.84 Mw (reference #10476)
The M 8.3–8.4 25 November 1941 was one of the largest submarine strike-slip earthquakes ever recorded in the Northeast (NE) Atlantic basin. This event occurred along the Eurasia–Nubia plate boundary between the Azores and the Strait of Gibraltar. After the earthquake, the tide stations in the NE Atlantic recorded a small tsunami with maximum amplitudes of 40 cm peak to trough in the Azores and Madeira islands. (reference #12941)
Other significant earthquakes nearby
Within 200 km, the deadliest first.
More
Significant earthquakes of 1941The 1900sEvery quake the USGS located in 1941Recent earthquakes near hereThis day in weather history
Sources
Significant earthquakes from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI earthquake 3690.