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

5.3MAG

MODERATE EARTHQUAKE

151 km WSW of Adak, Alaska

6 days ago

USGSTSUNAMI THREAT

A magnitude 5.3 earthquake struck 151 km WSW of Adak, Alaska on 11 Sept 2026, 10:47 UTC. The hypocentre was 40.9 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. The figures have been revised 1 time since the first report.

Depth: 40.9 km
Latitude: 51.21°N
Time: 10:47 UTC
Magnitude: M5.3

EPICENTRE

View the official report↗

MAGNITUDE 5.3

Can damage poorly constructed buildings; well-built structures usually escape with little harm.

The scale is logarithmic: this released about 89 times the energy of a magnitude 4.0, roughly the energy of 1 thousand tonnes of TNT.

40.9 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.