Jefferson Township, IA has a very low earthquake risk, with a total of 0 earthquakes since 1931. The USGS database shows that there is a 0.26% chance of a major earthquake within 50km of Jefferson Township, IA within the next 50 years.
View the probability of a major earthquake within the next 50 years in Jefferson Township, IA.
See Iowa Earthquake Report or Harrison County, IA Earthquake Report