The Napa quake was the one I felt. I was in Walnut Creek/Pleasant Hill area at the time. It was late at night and I was laying in bed awake, but I jumped out of the bed in an instant. My windows were slamming and closing and it felt like I was on a boat. I grew up on the west coast of Florida so I knew the feeling. Scared the living daylights out of me, but talk about an adrenaline rush. After that, I felt a few small 3.0 – 4.0's, which were interesting, but nothing like the Napa one. To think that was only a 6.1... The subduction zone you mentioned is called the Cascadia Subduction Zone and it's definitely potent. I wrote an article pertaining to it here.