An earthquake was recorded at 5:13 p.m. Thursday in Seneca county between Fostoria and Bettsville. It measured a magnitude of 2.5 . Quakes of this magnitude are recorded by seismographs, but are not always felt by people.
Fostoria police and the Seneca County Sheriff's Office say they received calls from residents who reported hearing a boom and rumbling sound in Fostoria and as far south as Tiffin around 5:30 p.m. Thursday.
(info above courtesy of Mike Hansen--Ohio Seismic Network, wtol.com and the Findlay Courier)
While not a very common occurrence, earthquakes are not extremely rare here. In fact, about 12 have happened in the past 2 years in Ohio. A lot of earthquakes have been centered in NE Ohio and offshore.
Here is a link for more info: Ohio Seismic Network