Illinois ? A small earthquake woke residents and shook furniture in northern Illinois early Wednesday, causing no major damage or injuries but startling people as far away as Michigan and Iowa.

The epicenter of the 3.8-magnitude earthquake was near the villages of Gilberts and Pingree Grove in Kane County, about 45 miles northwest of Chicago, according to the U.S. Geological Survey. The quake hit at 4 a.m. Sheriff’s dispatchers and the USGS were flooded with calls from concerned residents.

“It’s rare in northern Illinois,” USGS geophysicist Amy Vaughan said. “It’s downstate where we’d expect the larger quakes and where the larger ones have happened historically.”