Earthquake - Midwestern style!!

At approximately 5:36 a.m., we felt the effects of a 5.2 magnitude earthquake that was centered near Salem IL. I was still asleep, but it sounded like a herd of raccoons playing chase on the roof! A few hours later, we had an aftershock from a second earthquake that registered 4.5. I still think we are having earthquakes in the midwest because Texaco shut down their oil drilling & refining operation in Lawrenceville IL. But, I am not a geologist, so who knows for sure!