A small Alabama county has experienced its 16th earthquake in just eight months.

The U.S. Geological Survey (USGS) reported a 3.8 magnitude earthquake struck Greene County, Alabama around 1:44 a.m. The quake centered 12 miles northwest of Eutaw at a depth of 3.1 miles.

The county is the least populated county in the state.  There has been a cluster of quakes in the Northwest portion of the county.

“We do know that clusters of earthquakes occur from time to time as part of normal seismic activity in our dynamic planet,” Sandy Ebersole of the Geological Survey of Alabama said to AL.com.  “These clusters often go unnoticed, but are of interest to those studying geology and seismology as they can teach us more about fault movement, subsurface structures, and stress in the crust.

“These earthquake clusters or swarms are very rarely followed by a large magnitude earthquake.”

Monday’s quake was the strongest since November 2014.