Geology; August 1988; v. 16; no. 8; p. 739-742

On January 31, 1986, an earthquake of Richter magnitude 4.9 occurred in northeastern Ohio some 17.0 km south of the Perry Nuclear Power Plant (PNPP) and 12.0 km south of the Calhio injection wells.

The indicated pressure buildup of 5.3 MPa at the epicenter may have been sufficient to trigger the January 31, 1986, earthquake.

http://geology.geoscienceworld.org/cgi/content/abstract/16/8/739