M6.3 earthquake - 69 km S of Attu Station, Alaska

What happened

A magnitude 6.3 earthquake struck 69 km S of Attu Station, Alaska on 18 Jun 1940, 18:39 UTC at a depth of 25 km.

Earthquakes of this size are classed as Strong. Can cause damage in populated areas up to tens of kilometres away. This was a shallow earthquake, which tends to be felt more strongly at the surface.