8 km SE of Port Clarence, Alaska

7 days ago

USGS

A magnitude 4.0 earthquake struck 8 km SE of Port Clarence, Alaska on 10 Sept 2026, 23:03 UTC. The hypocentre was 5 km below the surface — shallow by seismological convention.

Depth: 5 km
Latitude: 65.21°N
Time: 23:03 UTC
Magnitude: M4.0

EPICENTRE

View the official report↗

MAGNITUDE 4.0

Noticeable shaking of indoor objects. Damage is unlikely.

The scale is logarithmic: this released about 32 times the energy of a magnitude 3.0, roughly the energy of 15 tonnes of TNT.

5 KM DEEP

Shallow earthquakes release their energy close to the surface, so they are felt more strongly, and do more damage, than deeper earthquakes of the same magnitude.