It happened just before 5 p.m. in the southern part of the county.
The USGS says the epicenter was approximately three miles south of Millersville.
It was close to a magnitude 2.3. First reports from the USGS said the quake was a 2.7.
RELATED VIDEO: Earthquake shakes part of Chester County in 2015
Action News is told the quake was felt across most of Lancaster County.
No damage has been reported.
----------
Send a breaking news alert
Report a correction or typo
Learn more about the 6abc apps