[PRCo] PA earthquakes

[Phillip Clark Campbell]

"Earthquakes in the central and eastern U.S., although less frequent than in the western 
U.S., are typically felt over a much broader region. East of the Rockies, an earthquake 
can be felt over an area as much as ten times larger than a similar magnitude earthquake 
on the west coast."

http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/ld1023196.php#summary


Phil