The New Madrid earthquake is supposed to have reversed the flow of the Mississippi for a time.
http://www.new-madrid.mo.us/132/Strange-Happenings-during-th….
There’s also a major fault under NYC. It hasn’t moved in a long time, but if/when it does the buildings there aren’t built to the same codes as in California.
https://en.wikipedia.org/wiki/Earthquake_activity_in_the_New…