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This’ll answer you question

http://www.bbc.co.uk/dna/h2g2/A2788617

Actually here is what it says:

You should expect earthquakes in areas where boundaries between tectonic plates meet, such as in California where the San Andreas fault is formed by the North American and Pacific plates rubbing against each other. However, in Pennsylvania, no such plate boundary exists. In fact, the nearest plate boundary is in the middle of the Atlantic Ocean, some 2,000 miles to the east.

Earthquakes in Pennsylvania can be traced back to events 200 million years ago when the supercontinent Pangea broke apart, forming the Atlantic Ocean. This caused faults and weaknesses throughout the underlying rocks of eastern North America. When the North American tectonic plate experiences stresses, sometimes that pressure can be released in areas of weakness far away from a plate boundary.

The vast majority of earthquakes in Pennsylvania occur in the south-eastern part of the state - in Berks, Lancaster, Lebanon and York counties. Geologists have no way of knowing if or when the next quake will occur in this area, where almost 40 have occurred during the last 200 years.

Generally, quakes in Pennsylvania are minor events. However, geologists cannot guarantee that a quake with a magnitude of five or six on the Richter Scale won’t happen tomorrow.

Kind of gives a whole new take on the Pennsylvania’s nickname ‘The Quaker State’, eh?

If you feel like searching and reading up on it, you could start with this litttle lot. http://www.google.com/search?hl=en&rl…

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