Evacuation, or the popular phrase 'bugging out' implies A. ready egress and B. destination. S.F. will probably retain physical links through helicopter and limited marine traffic. Without knowing any plans, I would hazard the closed NAS Alameda would become a major staging area. I would begin by assembling a kit and setting up a block group among your nieghbors. A central phone number outside of the disaster area you can get through to should be used to assure any and all relatives and friends of your group about your status. Phone lines are going to be overtaxed also. Have you done a safety inventory of your residence? Are major appliances and furniture strapped down, a wrench to secure the gas handy? All preparations will be for naught if you are injured or worse in the initial quake.