Earthquake? In Illinois?
I know, ho-hum to you left coasters, but we don't get 'em here except for this morning.
I was sleeping on the couch, and a very loud boom woke me up. I sat up, and everything shook back and forth for about ten seconds, maybe three times per second, picking back up once before dying out. I was aligned roughly in the direction of the quake as I sat up, so it was to-and-fro shaking as I felt it, not side to side.
U.S. Geological Survey site put the epicenter about nine miles WSW of me, at a very shallow depth of 3.5 miles.
By the way, when the shaking stopped I rolled over and went back to sleep, thinking, "I'll have to remember to check if that was an earthquake," but distant relatives called me bright and early to check on it. Oh, ya, I said.
No aftershocks, as for now.