Earthquake occurrences in southeast Missouri are not rare.

On Dec. 3, 1990, an earthquake was supposed to level the small town of New Madrid, Missouri and become one of the biggest natural disasters the country had ever experienced.

25 Years After The Great Missouri Earthquake That Never Happened. 2020-03-29 07:27:44 UTC 1.5 magnitude, 8 km depth New Madrid, Missouri, United States 1.5 magnitude earthquake 2020-03-29 07:27:44 UTC at 07:27 March 29, 2020 UTC A series of earthquakes hit the New Madrid seismic zone of southeastern Missouri, northeastern Arkansas, and adjacent parts of Tennessee and Kentucky, in December 1811 to February 1812.
Southeastern Missouri has had: (M1.5 or greater) 1 earthquake in the past 24 hours 3 earthquakes in the past 7 days; 10 earthquakes in the past 30 days Sixty-eight earthquakes that measured between Magnitude 2.0 and Magnitude 3.9 shook southeast Missouri from 2009-2011.

Three earthquakes had a magnitude of 7.0 or greater. Four earthquakes measuring magnitude 4.5 or greater occurred in the zone since 1974 (as of December 6, 2012).
Earthquake Frequency in the New Madrid Seismic Zone . The Mid-America Earthquake Center at the University of Illinois released a report in 2009, which suggested the effects of a force seven or stronger quake from the fault line.