Reviewed by USGS66y ago
M5.8 earthquake northern Mid-Atlantic Ridge
Thursday, March 9, 1961, 03:59:10 UTC · 10.569°N, 41.620°W
A magnitude 5.8 earthquake struck northern Mid-Atlantic Ridge on Thursday, March 9, 1961, 03:59:10 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M6.2 on October 20, 1957.
- Magnitude
- 5.8
- Moderate · mw
- Depth
- 15 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquake
In context
How big was it, and why here?
Energy released
6 kilotons of TNT
That is about 1/2 of the Hiroshima bomb. It released about 13 times the energy of a magnitude 5.0.
Tectonic setting
27 km
from the nearest mapped plate boundary, between the African and South American plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
15 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 75 km
USGS has not published any M2.5+ earthquake within 75 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 12 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.1northern Mid-Atlantic RidgeOctober 13, 1925 · 74 km W of this epicenter
- 7.1northern Mid-Atlantic RidgeDecember 2, 1918 · 240 km NW of this epicenter
- 7.0northern Mid-Atlantic RidgeFebruary 22, 1929 · 44 km W of this epicenter
- 6.8central Mid-Atlantic RidgeApril 21, 1919 · 223 km SE of this epicenter
- 6.7northern Mid-Atlantic RidgeJuly 13, 1906 · 110 km W of this epicenter
- 6.6northern Mid-Atlantic RidgeSeptember 3, 1927 · 205 km W of this epicenter
- 6.2northern Mid-Atlantic RidgeOctober 20, 1957 · 47 km SW of this epicenter
- 5.8central Mid-Atlantic RidgeAugust 10, 1951 · 272 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 1 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1925M7.5
North Atlantic Ridge
13 Oct 1925 · 63 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.