What was Illinois largest earthquake?
The 1968, The 1968 Illinois earthquake (or New Madrid event)[4] was the largest recorded earthquake in the U.S. Midwestern state of Illinois. Striking at 11:02 a.m. on November 9, it measured 5.4 on the Richter scale. Although there were no fatalities, the event caused considerable structural damage to buildings, including the toppling of chimneys.