Wait, what?

Holy fuck, seriously?! I mean, I know we've got the mid-continental gravity anomaly right next door, but. SERIOUSLY? Also, people who know stuff about earthquakes, how long do aftershocks go and at what range? Also, how, mmm, regular is the shaking in an earthquake? Because my couch was shaking strangely for about thirty seconds between ten and eleven this morning, and I know I didn't imagine it, except I was sure it couldn't be even a minor tremor because of location, but there were no exploding sounds at the time and it did feel like it started from the foundation of the house rather than, say, the sides, and we are actually closer to Illinois than Des Moines is and they ended up feeling it, so... *is probably wrong, but... still* o.O Dammit world! Weren't the tornadoes enough?!