Update: The U.S. Geological Survey upgraded the earthquake rating to 4.2.
The National Weather Service Michigan confirmed an earthquake occurred in Galesburg at 12:23 p.m. The U.S. Geological Survey also confirmed, rating the earthquake at 4.0 on the 10-point Richter scale.
Twitter users reported feeling the earthquake in the Ann Arbor area.
According to the U.S. Geological Survey, the largest earthquake in the state occurred in 1947. That earthquake was rated 4.6, and originated in south-central Michigan. It caused damage southeast of Kalamazoo, and was felt in Ohio and Illinois.