48 km ESE of Halibut Cove, Alaska

2 days ago

USGSAUTOMATIC

A magnitude 4.0 earthquake struck 48 km ESE of Halibut Cove, Alaska on 17 Oct 2026, 19:14 UTC. The hypocentre was 25.7 km below the surface — shallow by seismological convention. This is an automatic solution that an analyst has not yet reviewed, so the magnitude and depth above may still change. 1 other earthquake above our reporting threshold has been recorded within 250 km in the past 30 days.

Depth: 25.7 km
Latitude: 59.49°N
Time: 19:14 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.

25.7 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.