M6.4 earthquake - 255 km E of Poronaysk, Russia

What happened

A magnitude 6.4 earthquake struck 255 km E of Poronaysk, Russia on 1 Feb 1984, 07:28 UTC at a depth of 573 km.

Earthquakes of this size are classed as Strong. Can cause damage in populated areas up to tens of kilometres away. This was a deep earthquake; shaking at the surface is usually weak for its size.

The nearest town in our records is Poronaysk, about 256 km away in Sakhalin Oblast, Russia.