To add to your scary. That entire area is a magma chain. Rainier is one of the youngest mountains over there. If it goes the others go with it. St Helen's is a long way away and you can see the massiveness of he crater from Camp Muir on Rainer. Imagine Rainier, Adam's, st Helen's and hood all doing that within a short geological time frame. The northwest would be absolutely decimated and it would blow east over the plains and onto the Midwest.

On alighter note St Helen's has the only growing glacier in the world. Just cause the sun doesn't hit he crater that is.