At about 4:37 a.m. this morning, starting from its epicenter in West Salem, Ill., an earthquake rattled through the Midwest, but fortunately did not cause much damage. Tremors were felt in Chicago early on Friday.

The earthquake was measured to be a 5.2 on the Richter Scale, which typically can induce “moderate damage in well-built structures.” Several follow-up temblors shook through the Midwest Friday morning, the strongest of which registered at 4.5 on the Richter scale around 10:15 a.m., according to the Chicago Tribune.

Newsweek reported that the earthquake was felt as far as “Milwaukee, Des Moines, Iowa, and Atlanta, nearly 400 miles to the southeast”.

Not a typical seismic zone, like California for instance, most reactions to the earthquake were of surprise.

According to the U.S. Geological Survey, the largest historical earthquake in the region shook southern Illinois in 1968 at a magnitude of 5.4.