Earthquakes with magnitudes above 2.5 were registered along the New Madrid Fault on Saturday and Monday.

According to the U.S Geological Survey, a temblor measuring magnitude 2.5 occurred in southeast Missouri near the city of Howardville, 100 miles west-southwest of Princeton, on Saturday at 3:08 p.m.

Another earthquake measuring magnitude 2.6 hit near East Prairie, Missouri – about 85 miles west-southwest of Princeton – on Monday at 11:29 a.m.

According to the Michigan Technological University seismic education website called UPSeis (pronounced “up-size”), earthquakes of magnitude 2.5 or lower are rarely felt but registered by seismographs. Those 2.5 to 5.4 are often felt but cause little damage.

The New Madrid Fault Line or New Madrid Seismic Zone is found along Missouri’s border with Kentucky, Tennessee, Illinois and Arkansas along the Mississippi River and is named for the city of New Madrid, Missouri. The zone extends as far south as Memphis.

Its first recorded quake happened on Christmas Day 1699, but its strongest and most famous related earthquakes happened from December 1811 to February 1812, a series of four earthquakes each measuring magnitude 7.0 to 7.5.