Illinois vs Oklahoma Earthquake Risk

Illinois and Oklahoma 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 Oklahoma averages about 100 per year. Oklahoma experiences roughly 70 more earthquakes annually.

Illinois is associated with New Madrid, Wabash Valley seismic zones. Oklahoma is associated with Induced seismicity from wastewater injection. 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 40% in Oklahoma. Oklahoma has a larger percentage of residents exposed to seismic hazard.

Illinois's most notable earthquake: 1968 Southern Illinois (M5.4). Oklahoma's most notable earthquake: 2016 Pawnee (M5.8). These historical events illustrate the seismic potential of each state.