Earthquakes of historical and scientific significance(greater than 2 magnitude) are included. Smaller events may not appear on the map since smaller events are not documented in other sources, or are documented in obscure sources. A thorough review of Ohio Historical Society archived newspapers is suggested to capture addi-tional data. A free page-size version is available for download at the Survey's Web site: www.OhioGeology.com. An interactive version of this map also is available online.