(CNN) -- An early morning earthquake rattled northern Illinois on Wednesday, shaking an area about 50 miles west-northwest of downtown Chicago, the U.S. Geological Survey said.

The magnitude 4.3 quake hit just before 4 a.m. CT (5 a.m. ET), with an epicenter about 3 miles underground. The USGS pinpointed the quake between the towns of Virgil and Sycamore.

Several callers to CNN said the quake shook their homes severely, but there were no immediate reports of major damage.

Doug Dupont of Belvidere, Illinois, about 70 miles northwest of downtown Chicago, said the quake shook him out of bed and caused a 1-foot-long crack in the wall of his kitchen.

"It was really scary. It felt like a train was going by our house," Dupont said. "This is not California. This is northern Illinois. We are not supposed to get earthquakes."

http://www.cnn.com/2010/US/02/10/illinois.earthquake/index.html?hpt=T2