The last quake there actually was the subduction zone, but it's very deep when it's right under Seattle.
The Seattle Fault is right at the surface. An earthquake on it of equal magnitude to the 2001 Nisqually earthquake would make the Nisqually quake look like a joke.
http://seattletimes.nwsource.com/html/localnews/2002185299_earthquake20m.html
Scary.....another reason we stay 25 plus miles away from Seattle/Bellevue.....and another reason we keep lots of goodies on hand for disasters.....I remember the quake of 1965 also, and was at the beach when the Alaska quake hit (couldn't understand why the parents greeting us were so frantic when we returned).....we didn't know anything about it, and left the beach(luckily) before the tsunami hit.