Earthquake · Alaska
M6.3 earthquake near Nikolski, Alaska
A magnitude 6.3 earthquake struck 92 km SSW of Nikolski, Alaska on 3 September 2026 at 11:17 UTC, at a depth of 21 km.
- Magnitude
- 6.3 mww
- When
- 3 September 2026, 11:17 UTC
- Depth
- 21 km
- Location
- 52.16° N, 169.34° W
- Strongest shaking (estimated)
- Intensity IV (light)
- Felt reports
- 3 people told USGS they felt it
- 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 6.3 is a strong earthquake; there are about 130 a year worldwide, and they can cause damage in populated areas near the epicentre. At 21 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
22 earthquakes of magnitude 4 or more within 150 km in the 30 days after; the largest was a magnitude 5.4.
| Mag | Where | When (UTC) |
|---|---|---|
| 5.4 | 105 km SSW of Nikolski, Alaska | 3 September 2026, 20:21 |
| 5.3 | 108 km SSW of Nikolski, Alaska | 3 September 2026, 18:45 |
| 5.2 | 107 km SSW of Nikolski, Alaska | 3 September 2026, 11:24 |
| 5.2 | 102 km SSW of Nikolski, Alaska | 3 September 2026, 13:03 |
| 5.0 | 67 km SSW of Nikolski, Alaska | 3 September 2026, 20:22 |
| 4.9 | 99 km SSW of Nikolski, Alaska | 3 September 2026, 11:39 |
| 4.9 | 85 km SSW of Nikolski, Alaska | 5 September 2026, 18:00 |
| 4.8 | 102 km SSW of Nikolski, Alaska | 3 September 2026, 12:39 |
| 4.6 | 93 km SSW of Nikolski, Alaska | 3 September 2026, 16:11 |
| 4.5 | 101 km WSW of Nikolski, Alaska | 20 September 2026, 13:55 |
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.