Hi Roger - I don't know how well it might work for you but try this one for southern cal:
http://www.scecdc.scec.org/faultmap.html (here it is as 'non-clickable: http://www.scecdc.scec.org/Pics/AR.gif)

I never can seem to find a good map of faults in Northern Cal - or when I do I then lose it - Maybe Don or Petra have a good link for Northern Cal?

The Cal/Nevada map also shows faults as little brown lines...

Is this what you were asking for?

Canie