I used to live in the south Bay area. Personally, if a major quake hit the area, near the coast would be one of the LAST places I would want to be. There could be a tsunami, or not, but standing on the waterfront waiting to see which doesn't sound like the smartest move I could make.
Besides, aren't many of the communities around the bay (like Foster City), built on fill? The general consensus when I was there was that housing built on fill on the edge of a large body of water that was then shaken would quickly resemble something like a pit of quicksand.
As to leaving by boat... you may pirate a boat from shore, but what if you are out-pirated by meaner &/or better-equipped pirate dudes than yourselves? Walking the plank with a bullet in your chest sounds.... a bit iffy?
Sue