Mifflintown in Juniata County experienced an earthquake that was reported on June 12, 2019 at 8:30 PM. This is a rare occurrence for central PA. The USGS reported it at a magnitude of 3.4 ml and its depth was about 16.6 miles deep. It was felt in Centre, Huntingdon, and even Blair county. Over 1,557 people reported feeling the quake, but no injuries have been reported so far.
In 1991 Centre Hall, PA felt a 3.0 magnitude earthquake. Also, Mount Union had an earthquake the same year reported as a 2.5 magnitude quake.
The biggest earthquake recorded in Pennsylvania was near Erie, PA in Pymatuning. It was reported as a 5.2 magnitude quake in 1998.
In 2011, many areas in Central PA felt aftershocks from an earthquake that occurred in Virginia.