In reply to Jim.

Homemade rebar that will move with a jolt can be fabricated up from truck and car coil springs. Attach them to the regular rebar at the points where posts and beams meet. The pour will crack, even fall out some but the building will be repairable and should stay standing. It is a numbers thing, a 9 is going to knock down everything. With a one story building, I think the lateral stress from a quake is what pushes them over, a crack the whip sort of thing.
That slip fault at "big rock" could have moved millions of years ago, deep under ground and been exposed by weathering and uplift. The best way to look for recent fault movement is in the stream beds. If the stream has a sharp waterfall or a zig-zag in its course, follow the rock line from there, try not to build where there is evidence of an active fault.