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I was wondering the other day if Pennsylvania has a state equivalent of FEMA (Federal Emergency Management Agency). Yes, we do, and sure enough, it is PEMA (Pennsylvania Emergency Management Agency).
PEMA has a list of events comprising Pennsylvania Disaster History. Events are listed in chronological order, giving: date, general type of disaster, areas affected, and the response taken.
I re-classified the events somewhat, and came up with the following graph of the number of disasters, by type:
Historically, earthquakes don't even make the list!
Based on this list, if you live in Pennsylvania, watch out for flooding and weather-related disasters, and fire. Of course, economic downturns are not listed.