I think Susan's point is that if the Big One happens, a lot of buildings will collapse, many into the bay and then you're going to have widespread fires in a high population density area with no way out and no relief. Sounds like a lot of people are going to die: some quickly by being crushed, others from fire and smoke inhalation, and still others will die at the hands of their fellow survivors competing for food and water during the walk south. Whether or not a tsunami gets through the Golden Gate is almost moot -- just devastation on top of destruction.

One of the first things I learned about surviving bad situations was to be somewhere else, but you dismissed that option early in this discussion. I'm glad I've chosen to live elsewhere.