U.S. Geological Survey (USGS) National Earthquake Information Service reported that an earthquake measured at magnitude 3.8 occurred today in Indiana.

A magnitude 3.8 earthquake, which may be felt within a radius of 60 miles, is no big deal. But it is when it occurred within the state of Indiana where no earthquake bigger than magnitude 5.2 has been recorded historically.

The earthquake in Indiana occurred Thursday Dec 30, 2010 at 12:55:21 UTC. The epicenter was located 15 miles ESE of kokomo, Indiana, 15 miles  WSW of Marion, Indiana, 25 miles S. of Wabash, Indiana and 59 miles NNE of Indianapolis, Indiana.

USGS said it is known how this earthquake occurred.

"This earthquake is not thought to be associated with Indiana's best known seismic zone (the Wabash Valley Seismic Zone) along the Wabash river in southwestern Indiana. It is difficult to determine if a known fault outside of an active seismic zone could generate a small earthquake like this one. Sesimologists estimate the fault that slipped to cause this earthquake has an area of about 1 square mile."

The biggest earthquake in Indiana was recorded on Sept 28, 1909. The earthquake measured at magnitude 5.10 occurred in Wabash River Valley near Terre Haute Indiana.