Scientists Reassure Pennsylvania Residents in Quake Swarms

November 13, 2009

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Scientists have met with residents of a central Pennsylvania town to reassure them about the hundreds of tiny earthquakes the area has experienced over the past year.

Charles Scharnberger, Millersville University professor emeritus of geology, says fracturing rock is to blame for the approximately 817 tremors recorded since October 2008. He says a lot of earthquake activity is cyclical, and it can take years for stress to build up enough to cause them.

But Scharnberger says residents shouldn’t worry about a stronger and more damaging earthquake, since there are no fault lines in the area. He says the quakes on the east coast occur where different types of rock intersect.

Jeri Jones of Jones Geological Services says higher than average rainfall collecting in the water table might be triggering the movement of rock.

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Latest Comments

  • November 20, 2009 at 7:26 am
    Robbin' says:
    Batman, my Aunt has lived in Dillsburg for over 60 years. I talked to her and visited numerous times and I know for a fact that there are no old mining tunnels. Do you work ... read more
  • November 18, 2009 at 6:51 am
    Batman says:
    Holy mining engineer, Robin! Great question. However, there is no marcellus shale formation in Dillsburg, PA, the locus for these earthquakes; there is no drilling in north... read more
  • November 13, 2009 at 3:39 am
    No Fault? says:
    No faults in PA, just different kinds of rock intersect one another?? Hmmmm....
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