Illinois and Missouri are on the list of states with the highest risk for earthquakes.
A new federal earthquake map dials up the shaking hazard just a bit for about one-third of the United States and lowers it for one-tenth of the nation.
The U.S. Geological Survey updated Thursday its national seismic hazard maps for the first time since 2008, taking into account research from the devastating 2011 earthquake and tsunami off the Japanese coast and the surprise 2011 Virginia temblor.
Scientists said today that the New Madrid fault zone in the nation's midsection is active and could spawn future large earthquakes.
The journal Science published the study online. U.S. Geological Survey seismologist Susan Hough was part of the study. She says the fault zone is ``not dead yet.'' Researchers have long debated just how much of a hazard New Madrid poses. The zone stretches 150 miles, crossing parts of Arkansas, Illinois, Indiana, Kentucky, Mississippi, Missouri and Tennessee.