Maybe T.O. has exclusive ordinances preventing them? LOL. It has to do with the type of strata underlying an area. Some conduct shock waves better than others, I recall from college geology.
Yeah could be God didn't file the proper permits with the city, that happens quite a bit here. The planning commission is pretty draconian here.
Seriously you may be right, We are on top of a solid rock hill and our footings are locked into the rock so it might have dampened before it reached us.