JONESBORO, AR (KAIT) – Saturday’s 3.6 magnitude earthquake near Trumann, Arkansas was a reminder that the New Madrid Seismic Zone is still active.
The 3.6 mag. earthquake was centered just southwest of Trumann in Poinsett County and was felt across a dozen or so counties in Arkansas, Missouri, Tennessee, and Mississippi. It was one of hundreds of earthquakes that shake the region each year.
The New Madrid Seismic Zone (NMSZ) runs 150 miles from Cairo, IL to Marked Tree, AR and is described as a series of faults called the Reelfoot Rift. The rift formed about 500 million years ago when scientists believe the continent tried to split apart. It didn’t happen, but what was left was a weakened spot in the bedrock below. Thanks to the Mississippi River, the faults were covered up by sand and other sediment. The NMSZ also differs from what many consider as traditional fault zones because it is not along a plate boundary where to pieces of earth’s crust are rubbing against each other.
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