Colorado vs Illinois Earthquake Risk

Illinois has a higher earthquake risk with a score of 5/10 (Moderate) compared to Colorado at 4/10 (Moderate). This means Illinois faces more frequent and potentially more destructive seismic events.

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

Colorado is associated with Rio Grande Rift. Illinois is associated with New Madrid, Wabash Valley seismic zones. These fault systems determine the type and frequency of seismic activity each state experiences.

In Colorado, approximately 25% of the population lives in areas at risk from earthquakes, compared to 15% in Illinois. Colorado has a larger percentage of residents exposed to seismic hazard.

Colorado's most notable earthquake: 1882 Northern Colorado (M6.6). Illinois's most notable earthquake: 1968 Southern Illinois (M5.4). These historical events illustrate the seismic potential of each state.