I have a great number of relatives who report having heard Mt. St. Helens' eruption as it bounced off the atmosphere, as far away as "most of the way across Ore

I have a great number of relatives who report having heard Mt. St. Helens' eruption as it bounced off the atmosphere, as far away as "most of the way across Oregon" I have no doubt that some did, yet I wonder how many of them came up with the memory later.