Arkansas vs Illinois Earthquake Risk

Arkansas and Illinois 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.

Arkansas averages approximately 40 earthquakes per year, while Illinois averages about 30 per year. Arkansas experiences roughly 10 more earthquakes annually.

Arkansas is associated with New Madrid Seismic Zone (NE corner). 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 Arkansas, approximately 20% of the population lives in areas at risk from earthquakes, compared to 15% in Illinois. Arkansas has a larger percentage of residents exposed to seismic hazard.

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