Illinois vs Tennessee Earthquake Risk

Illinois and Tennessee share the same risk score of 5/10 (Moderate). Both states face similar levels of seismic hazard, though the specific fault systems and earthquake characteristics differ.

Illinois averages approximately 30 earthquakes per year, while Tennessee averages about 50 per year. Tennessee experiences roughly 20 more earthquakes annually.

Illinois is associated with New Madrid, Wabash Valley seismic zones. Tennessee is associated with New Madrid Seismic Zone (western TN). 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 25% in Tennessee. Tennessee has a larger percentage of residents exposed to seismic hazard.

Illinois's most notable earthquake: 1968 Southern Illinois (M5.4). Tennessee's most notable earthquake: 1811 New Madrid (felt strongly). These historical events illustrate the seismic potential of each state.