Earthquake · Alaska
M6.4 earthquake near Attu Station, Alaska
A magnitude 6.4 earthquake struck 223 km ESE of Attu Station, Alaska on 4 March 2026 at 17:54 UTC, at a depth of 10 km.
- Magnitude
- 6.4 mww
- When
- 4 March 2026, 17:54 UTC
- Depth
- 10 km
- Location
- 52.33° N, 176.37° E
- Strongest shaking (estimated)
- Intensity VI (strong)
- 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 6.4 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
52 earthquakes of magnitude 4 or more within 150 km in the 30 days after; the largest was a magnitude 5.7.
| Mag | Where | When (UTC) |
|---|---|---|
| 5.7 | 231 km ESE of Attu Station, Alaska | 6 March 2026, 21:08 |
| 5.3 | 229 km ESE of Attu Station, Alaska | 17 March 2026, 16:21 |
| 5.2 | 226 km ESE of Attu Station, Alaska | 24 March 2026, 20:59 |
| 5.1 | 233 km ESE of Attu Station, Alaska | 8 March 2026, 22:41 |
| 5.0 | 221 km ESE of Attu Station, Alaska | 3 April 2026, 08:22 |
| 5.0 | 233 km ESE of Attu Station, Alaska | 18 March 2026, 04:36 |
| 4.8 | 229 km ESE of Attu Station, Alaska | 4 March 2026, 19:04 |
| 4.7 | 228 km ESE of Attu Station, Alaska | 13 March 2026, 03:30 |
| 4.7 | 235 km ESE of Attu Station, Alaska | 6 March 2026, 05:21 |
| 4.6 | 231 km ESE of Attu Station, Alaska | 3 April 2026, 14:07 |
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.