1986 Ohio earthquake

On January 31, 1986, at 11:46 EST (03:46 UTC), an earthquake of M_b 5.0 struck 40 km east of Cleveland, Ohio, and about 17 km south of the Perry Nuclear Power Plant. The earthquake was felt over a broad area due to its location. Parts of the US such as the District of Columbia, and parts of Ontario, Canada. The earthquake generated relatively high accelerations (0.18 g) of short duration at the Perry plant. Thirteen aftershocks were detected in the following weeks, with six occurring within the first 8 days. Two of the aftershocks were felt. Magnitudes for the aftershocks ranged from about 0.5 to 2.5. Focal depths for all of the earthquakes ranged from 2 to 6 km. Except for one small earthquake, all of the aftershocks occurred in a very tight cluster with a north-northeast orientation.