Mj61_BQhdZAmore-earthquakes-in-the-new-madrid-fault-whats-going-onMore Earthquakes In The New Madrid Fault. What's Going On?Most people in the United States (and perhaps around the world) know only one fault line by name: the San Andreas Fault, which runs almost the entire length of California and is often said to be on the verge of triggering "the big one."