Hot in the earthquake news today is a presentation which shows how an Easter earthquake is still shoving dirt around in California.
I don't know that this takes us anywhere, but it shows things are terribly complex. From a map of motions, I wouldn't dare consider where the next earthquake will take place. Is it in the zones of no motion, lots of motion, weird motion??? My thoughts are that the rock down there is just a big sandpile of broken rock, and you can't get much from the surface geology.