If it is a magnitude 9, you will feel a magnitude 9 at your house. Roger, if he feels it at all, will feel a magnitude 9 at his house. I don't know enough about how far east the megathrust is locked, or how deep it is at your house. I'll just totally guess and say you will have intensity VI at your house. You will have a higher intensity, like VIII, for a M7.0 on the Seattle fault. I'm semi-anonymous so can say stuff like that...I agree with Roger that he it is not useful, or good for his reputation, to guess. The important thing is, that unless there is a landslide beneath you, the motion for a M9 will be far greater at the top of the Space needle than in your front yard.
Chris