What Woke You Up This Morning?

At almost exactly at 4 am, I was awoken by the sound of thunder. Thunder? I got up, showered, and made my way downstairs. Turning on the local news, I found out there had been an earthquake, centered in DeKalb, Illinois. I live near Madison, Wisconsin, but still felt the effects. It hadn't been thunder, but a tremor. Some people in my area had pictures falling off the wall. Wisconsin weather- snowstorm one day, earthquake the next. What will happen tomorrow?