Illinois vs South Carolina Earthquake Risk

Illinois and South Carolina 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 South Carolina averages about 15 per year. Illinois experiences roughly 15 more earthquakes annually.

Illinois is associated with New Madrid, Wabash Valley seismic zones. South Carolina is associated with Middleton Place-Summerville 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 20% in South Carolina. South Carolina has a larger percentage of residents exposed to seismic hazard.

Illinois's most notable earthquake: 1968 Southern Illinois (M5.4). South Carolina's most notable earthquake: 1886 Charleston (M7.3). These historical events illustrate the seismic potential of each state.