Earhtquakes..............NC...............with the way the weather has been the last couple of years anything is possible.
Funny thing is if we did have a earthquake now it would be 2012 before the code would change............
Bruce many of the homes have CSST because it much easier to install then black pipe. That is why you don't normally see it except on older homes. Don't have to lug around all that steel and threading machines.