The last "severe" earthquake in Pennsylvania was in 1800, so we may be due: http://earthquake.usgs.gov/earthquakes/states/pennsylvania/history.php.

You can find your state's history here:
http://earthquake.usgs.gov/earthquakes/states/

Several posts on this thread have mentioned insurance checks arriving.

The standard homeowners insurance policy we have did not include earthquake insurance. I suspect that this is the norm in the industry. We bought the optional earthquake coverage rider, just in case, for a few more bucks a month. I wonder if others have done the same, or if their policy automatically included coverage. If you don't know whether your covered, it's worth a call to your agent.