⚠️ This earthquake carries a tsunami threat. Follow official guidance from your national agency.

6.3MAG

STRONG EARTHQUAKE

84 km SSW of Nikolski, Alaska

15 days ago

USGSTSUNAMI THREAT

A magnitude 6.3 earthquake struck 84 km SSW of Nikolski, Alaska on 03 Sept 2026, 11:17 UTC. The hypocentre was 35 km below the surface — shallow by seismological convention. No felt reports have been received so far. The reporting agency flagged a tsunami threat for this event; follow official warnings rather than this page. 38 other earthquakes above our reporting threshold have been recorded within 250 km in the past 30 days.

Depth: 35 km
Latitude: 52.26°N
Time: 11:17 UTC
Magnitude: M6.3

EPICENTRE

View the official report↗

MAGNITUDE 6.3

Can be destructive in populated areas up to about 160 km across.

The scale is logarithmic: this released about 89 times the energy of a magnitude 5.0, roughly the energy of 43 thousand tonnes of TNT.

35 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.