Given that this is a seismically active area, I'd imagine you'd want to do more than rest the house on its concrete piers, like you'd want to strap it down. I did a quick Google search and came up with an entire instruction manual from the state of California on exactly this topic. Where would we be without the web?

http://www.abag.ca.gov/bayarea/eqmaps/fixit/manual/PT11-Ch-6.PDF