M4.0 earthquake — Rat Islands, Aleutian Islands, Alaska
An magnitude 4.0 earthquake occurred Rat Islands, Aleutian Islands, Alaska on Aug 20, 2026 at 02:45 UTC. The epicenter was at a depth of 35 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 | 35.0 km |
| Coordinates | 50.950, 178.765 |
| Time | Aug 20, 02:45 UTC |
| Location | Rat Islands, Aleutian Islands, Alaska |
| USGS event ID | us6000tm1i |
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 |
|---|---|---|---|
| M2.9 | 70 km | Aug 19, 18:12 UTC | Rat Islands, Aleutian Islands, Alaska |
| M3.7 | 74 km | Aug 19, 12:12 UTC | Rat Islands, Aleutian Islands, Alaska |
| M3.1 | 76 km | Aug 21, 11:22 UTC | 261 km WSW of Adak, Alaska |
| M3.9 | 87 km | Aug 19, 16:49 UTC | Rat Islands, Aleutian Islands, Alaska |
| M2.9 | 89 km | Aug 19, 23:05 UTC | Rat Islands, Aleutian Islands, Alaska |
| M2.6 | 97 km | Aug 18, 13:03 UTC | 244 km WSW of Adak, Alaska |
Earthquake activity in this area
Source: USGS earthquake catalog. Automated readings may be revised. Not for emergency use.