Yes, that was an earthquake in Michigan
The U.S. Geological Survey confirms a 4.2 magnitude earthquake hit Michigan at 12:23 this afternoon.
The epicenter of the quake was near Kalamazoo, about 8 km south of Galesburg.
An earthquake of this strength usually causes noticeable shaking of indoor objects and rattling noises. Lots of people across Michigan and in Chicago reported feeling the quake on social media.
A quake of this strength generally causes none to minimal damage. We don't have any reports of damage or injuries.
If you felt the quake, you can report it to the USGS here (click the "Did you feel it? - Tell us!" link on that page).