Indiana Earthquake

An earthquake of magnitude 3.8 shook parts of central Indiana Thursday morning - and felt even by some residents of Chicago.

U.S. Geological Survey initially estimated the quake's force had a magnitude of 4.2, but since that number is down, according to the Associated Press.

minor earthquakes have been truly normal in the west, along with Indiana. Most have been in operation from 2.0 to 4.0 of the Richter scale, and are hardly felt or not at all. But the state has given smaller earthquakes above 5.0, as well as some imagine the "big" is in the future.

Several major earthquakes set timeline for the continental U.S. occurred in the winter of 1811-1812 along the New Madrid seismic zone, which extends from just west of Memphis, Tennessee, in southern Illinois.

Residents of Chicago, Naperville and Buffalo Grove, Illinois, told NBC Chicago felt their beds shaking and ceiling fans saw their move early Thursday. A geophysicist told the AP an earthquake of magnitude 3.8 "feel like a passing truck."