The 1998 Pymatuning earthquake occurred in the U.S. state of Pennsylvania on September 25 at 19:52 UTC.

With a magnitude of 5.2 mbLg,[1][4] it was the largest recorded earthquake in Pennsylvania's history.

The earthquake caused minor damage in towns near its epicenter and was felt in the states of Ohio, Pennsylvania, Indiana, Michigan, New York, Illinois and New Jersey, as well as Southern Ontario in Canada.

A three-month date range revealed 120 dry household-supply wells on the ridge of Jamestown and Greenville.

[6] Declines of up to 100 feet (30 m) were observed on a ridge where at least 80 of these wells resided.