Do you have a link? I have a friend who lives on an island in that Strait
https://www.youtube.com/watch?v=haeQhHs3m_8
http://www.crew.org/sites/default/files/CREWCascadiaFinal.pdf
https://en.wikipedia.org/wiki/1700_Cascadia_earthquake
I am thinking of retiring up that way, been looking at island property for two years.