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

6.5MAG

STRONG EARTHQUAKE

165 km W of Nikolski, Alaska

2 hours ago

USGSTSUNAMI THREAT

A magnitude 6.5 earthquake struck 165 km W of Nikolski, Alaska on 17 Sept 2026, 14:19 UTC. The hypocentre was 111.7 km below the surface — intermediate 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. The figures have been revised 13 times since the first report. 4 other earthquakes above our reporting threshold have been recorded within 250 km in the past 30 days.

Depth: 111.7 km
Latitude: 52.76°N
Time: 14:19 UTC
Magnitude: M6.5

EPICENTRE

View the official report↗

MAGNITUDE 6.5

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

The scale is logarithmic: this released about 180 times the energy of a magnitude 5.0, roughly the energy of 85 thousand tonnes of TNT.

111.7 KM DEEP

At this depth the energy spreads before it reaches the surface. Shaking is usually weaker than a shallow earthquake of the same size, but it can be felt across a wider area.