Ginger, my house was at the epicenter of the Northridge earthquake, there was damage, there was drama, it took about a year for things to get back to normal. I figure I've seen the worse. Plus, what your home sits on has as much to do with your risk as where you are. San Diego is a little better as a location, and I'm on a hill of bedrock. The homes in the valley that were destroyed were on silty riverbed type soil, shake and quaked to death.
On another note, you can carry over your old property tax if you move to a cheaper home. IE move to semi-rural CA, just as nice a house, have a little equity cashed out, keep the property tax from when you bought this house. So your not trapped in that house if you really want a differrent location, just can't "upgrade" in the same neighborhood.