Illinois vs Missouri Earthquake Risk

Missouri has a higher earthquake risk with a score of 6/10 (Moderate-High) compared to Illinois at 5/10 (Moderate). This means Missouri faces more frequent and potentially more destructive seismic events.

Illinois averages approximately 30 earthquakes per year, while Missouri averages about 200 per year. Missouri experiences roughly 170 more earthquakes annually.

Illinois is associated with New Madrid, Wabash Valley seismic zones. Missouri is associated with New Madrid Seismic Zone. These fault systems determine the type and frequency of seismic activity each state experiences.

In Illinois, approximately 15% of the population lives in areas at risk from earthquakes, compared to 30% in Missouri. Missouri has a larger percentage of residents exposed to seismic hazard.

Illinois's most notable earthquake: 1968 Southern Illinois (M5.4). Missouri's most notable earthquake: 1811-12 New Madrid (M7.5-7.7). These historical events illustrate the seismic potential of each state.