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The earthquake originated south of Galesburg.

(File | MLive.com)

UPDATE: The USGS has upgraded the quake to a 4.2

KALAMAZOO, MI -- The United States Geological Survey website confirmed the tremors felt across Michigan Saturday afternoon were caused by an earthquake in Kalamazoo County.

At 12:23 p.m. Saturday, an earthquake, which originated eight kilometers south of Galesburg, measured 4.0 on the Richter scale, according to the United States Geological Survey.

The quake prompted emergency calls from across the Kalamazoo-area, tying up dispatch lines in Kalamazoo County, Kalmazoo Public Safety Lt. Scott Bowling said.

As of early Saturday afternoon, there were no reports of any injuries, or major damages, sustained during the quake.

* Full coverage of the Michigan earthquake