M6.1 earthquake near Helena, Montana

What happened

A magnitude 6.1 earthquake struck The 1935 Helena, Montana Earthquakes (Mainshock) on 19 Oct 1935, 04:48 UTC at a depth of 15 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.

The nearest town in our records is Helena, about 30 km away in Montana, United States.