Because Ohio is not near any major fault lines, like California is.
There have been a number of major tornadoes in Ohio, the worst however was the Xenia, Ohio tornado of April 3, 1974. This tornado was rated F5, the highest intensity level for tornadoes and was one of the strongest and most destructive tornadoes of the 20th century.
The Ohio Department of Natural Resources has free information for the public on the topic at its Website, including a great map that shows the locations of all the recorded earthquakes in Ohio with their dates and magnitudes
The probability that an earthquake will occur in Ohio or, for that matter, anywhere else, is virtually a 100% certainty. The real questions are when might the next one occur and, more importantly, what will be its magnitude. Earthquakes occur quite often, but most are of such low magnitude as to register only on extremely sensitive instruments. People don't feel them and often news media don't even report them. The U.S. Geological Survey website contains a wealth if information on earthquakes. Check out their website below.
Every state gets tornadoes. Pennsylvania and Ohio have even had F4 and F5 tornadoes. The inland states do not get hurricanes. The Dakotas, Florida, and Michigan have only have a few small earthquakes. Pennsylvania has had a few earthquakes, but none have been very damaging.
The phone number of the Ohio Historical Center Ohio Village is: 614-297-2300.
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The phone number of the Ohio River Museum is: 740-373-3717.
The phone number of the Ohio Academy Of Science is: 614-488-2228.
The phone number of the Ohio Railway Museum is: 614-885-7345.
The phone number of the Ohio Glass Museum is: 740-687-0101.
The phone number of the Ohio Military Museum is: 330-832-5553.
The phone number of the Norhteast Ohio Museum is: 330-336-7657.