M4.0 earthquake — 92 km SSW of Unalaska, Alaska
An magnitude 4.0 earthquake occurred 92 km SSW of Unalaska, Alaska on Sep 15, 2026 at 05:21 UTC. The epicenter was at a depth of 18 km — a shallow earthquake. Shallow quakes concentrate their energy near the surface, so they tend to produce stronger shaking close to the epicenter.
Event data
| Magnitude | M4.0 |
|---|---|
| Depth | 18.4 km |
| Coordinates | 53.099, -167.028 |
| Time | Sep 15, 05:21 UTC |
| Location | 92 km SSW of Unalaska, Alaska |
| USGS event ID | aka2026shcitc |
What this magnitude typically means
Light earthquakes are felt by most people nearby but rarely cause damage. Distance, depth, and soil type determine whether a quake feels sharp or barely noticeable. Tremor does not compute a single local shaking figure here, because how strong a quake feels at any address depends on distance, depth and local geology — open the interactive globe to explore the ShakeMap and estimated intensity.
Nearby recent earthquakes
| Magnitude | Distance | Time (UTC) | Location |
|---|---|---|---|
| M3.6 | 4 km | Sep 16, 12:47 UTC | 95 km SSW of Unalaska, Alaska |
| M2.5 | 46 km | Sep 15, 13:14 UTC | 92 km E of Nikolski, Alaska |
| M2.6 | 147 km | Sep 16, 03:41 UTC | 98 km SE of Akutan, Alaska |
| M2.9 | 153 km | Sep 16, 02:57 UTC | 58 km SE of Akutan, Alaska |
| M3.3 | 158 km | Sep 14, 10:29 UTC | 116 km SE of Akutan, Alaska |
| M3.6 | 171 km | Sep 18, 16:56 UTC | 47 km WSW of Nikolski, Alaska |
Earthquake activity in this area
Source: USGS earthquake catalog. Automated readings may be revised. Not for emergency use.