Earthquake · northern Mid-Atlantic Ridge
M6.6 earthquake near northern Mid-Atlantic Ridge
A magnitude 6.6 earthquake struck northern Mid-Atlantic Ridge on 21 March 2026 at 12:16 UTC, at a depth of 10 km.
- Magnitude
- 6.6 mww
- When
- 21 March 2026, 12:16 UTC
- Depth
- 10 km
- Location
- 23.86° N, 45.80° W
- USGS PAGER alert
- Green
- Tsunami
- The USGS flagged it for possible tsunami. Check the official warning centres
- Source
- USGS event page
What it means
A magnitude 6.6 is a strong earthquake; there are about 130 a year worldwide, and they can cause damage in populated areas near the epicentre. At 10 km deep it was a shallow earthquake, which usually means stronger shaking near the epicentre.
The magnitude may be revised as more data comes in. Read Earthquake magnitude explained for what the numbers mean.
Aftershocks
5 earthquakes of magnitude 4 or more within 150 km in the 30 days after; the largest was a magnitude 5.2.
| Mag | Where | When (UTC) |
|---|---|---|
| 5.2 | northern Mid-Atlantic Ridge | 30 March 2026, 14:43 |
| 5.1 | northern Mid-Atlantic Ridge | 23 March 2026, 01:41 |
| 4.8 | northern Mid-Atlantic Ridge | 8 April 2026, 14:55 |
| 4.6 | northern Mid-Atlantic Ridge | 22 March 2026, 05:26 |
| 4.3 | northern Mid-Atlantic Ridge | 22 March 2026, 17:52 |
Near the coast, strong or long shaking can be followed by a tsunami: see Tsunami warning signs.
Not an official warning service. In an emergency, follow your local authorities.