Union County, IL has a moderate earthquake risk, with a total of 2 earthquakes since 1931. The USGS database shows that there is a 14.73% chance of a major earthquake within 50km of Union County, IL within the next 50 years. The largest earthquake within 30 miles of Union County, IL was a 5.0 Magnitude in 1977.
View the probability of a major earthquake within the next 50 years in Union County, IL.
View the number of earthquake incidents in Union County, IL by year that are more than 2.5 Magnitude.
Total Number of Earthquakes in Union County, IL within 30 miles. All distances and depths in the table are measured in miles.