Californians may still build wooden houses, but they no longer have wooden roofing. You don't see wood shingles on new houses any more, although there are certain flame-retardant wood shingles that are still legal. All new or replacement roofs in California have to be flame-retardant. Frame houses hold up better in earthquakes. The main concern for fire danger has always been roofing, not walls.
-Joe Offer-