According to the Ohio Seismic Network, Ohio has experienced more than 200 felt earthquakes since 1776, and that 15 of these events have caused minor to moderate damage. The largest historic earthquake centered in Ohio was in 1937 in Shelby County. This event, estimated to have had a magnitude of 5.4, caused considerable damage in Anna and several other western Ohio communities.
Northeastern Ohio, east of Cleveland, has experienced many small earthquakes, including a 5.0 magnitude event in 1986 that caused moderate damage and a damaging 4.5 magnitude earthquake at Ashtabula in 2001. A broad area of southern Ohio has experienced more than 30 felt earthquakes.