Actually that answer would be laying 8,000 miles away in Tokyo, Japan. In Tokyo the bedrock is 1 mile and a half feet down. So instead of digging to bedrock, and they are building in a earthquake zone they would bore several holes into the ground and pour concrete into them, then they would pour a solid concrete layer on top, and in total it would be as strong as bedrock itself.
Watch the clip below
http://www.youtube.com/watch?v=1vOtS...eature=related