The U.S. Geological Survey is reporting that, in addition to the 4.0 magnitude earthquake centered near East Prairie, Mo. early this morning, a second, smaller earthquake originated today near the same location in the New Madrid Seismic Zone.
The second earthquake happened around 11:05 a.m.
The Great Central U.S. ShakeOut is an annual event intended to raise awareness about what to do in the event of a major earthquake.
Steve Besemer of the Missouri Emergency Management Agency says in Missouri and Illinois, more than 900,000 people, most of them students, participated in today's drill.
He says if an earthquake hits, there are three simple steps people should follow.
Friday, Dec. 16, marks the 200th anniversary of the first of the New Madrid earthquakes, a series of large tremors centered in northeastern Arkansas and southeastern Missouri.
The earthquakes of 1811 and 1812 were so big, legend has it, they made the Mississippi River run backwards.
Seismologist Susan Hough of the U.S. Geological Survey in Pasadena, Calif., says that’s actually true – at least where the fault crosses underneath the river channel.
St. Louis Public Radio is a service of the University of Missouri-St. Louis.