Wow.. This is pretty interesting to me. I heard on the news that the earthquakes are continuing in York county. One even occurred while a scientist was setting up a portable seismograph. They say they hope to be able to detect where exactly the tremors are happening so they can determine the cause.
They seem to be pretty weak quakes but still it's pretty unusual on the east coast and even more unusual to have a swarm of them like Dillsburg has been experiencing.