Massac County, IL has a moderate earthquake risk, with a total of 2 earthquakes since 1931. The USGS database shows that there is a 17.51% chance of a major earthquake within 50km of Massac County, IL within the next 50 years. The largest earthquake within 30 miles of Massac County, IL was a 4.2 Magnitude in 1994.
View the probability of a major earthquake within the next 50 years in Massac County, IL.
View the number of earthquake incidents in Massac County, IL by year that are more than 2.5 Magnitude.
Total Number of Earthquakes in Massac County, IL within 30 miles. All distances and depths in the table are measured in miles.