[PIF]

I was in Seattle both times Mt St. Helens blew. I never heard anything
—

May 18, 1980 : I lived in Port Townsend, WA, 40 miles north of Seattle and heard it erupt that morning, our house shook. It only had one (1) major eruption.

[cuban leaf]

Wow. Must have been a standing wave thing. :)