Why does Indiana have earthquakes?

Indiana and a number of neighboring states experience earthquakes, which in modern times have been small and nondestructive. It is unusual to have a major fault in the middle of a continent, but that does exist in this region.

Southern Indiana is close to the New Madrid fault. New Madrid, now in Missouri, was the location of the New Madrid earthquakes, 1811-1812, which historical accounts suggest were the largest ever recorded in the eastern US and possibly the largest in North America. The fault is now well mapped and the active area includes several neighboring states and much of Indiana.