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5 earthquakes shake Missouri shoes in 9 hours

5 earthquakes shake Missouri shoes in 9 hours

 


New Madrid County, Missouri – The most famous earthquake zone in the Midwest was crowded all night, causing a few small earthquakes in less than nine hours.

Seismographers recorded five earthquakes between 7:11 p.m. Monday and 3:40 a.m. Tuesday in northwest Tennessee, east of Missouri Butle.

The University of Memphis Center for Earthquake Research and Information has documented the incidents as follows:

7:11 PM – 1.5 degrees (South Ridley, Fig.) 9:58 PM – 1.6 degrees (South Ridley, Fig.) 3:00 AM – 2.6 degrees (Southeast Ridley, Fig.) 3:34 AM – 2.1 degrees (Southeast Ridley, Tenn.) 3:40 AM – 3.1 degrees (Northwest of New Bern, Tenn.)

This area is known as the New Madrid Seismic Zone.

Earthquake handbook provides tips on safety and preparedness

The New Madrid Seismic Zone, located in southeastern Missouri and adjacent states (Tennessee, Kentucky, Arkansas, and Illinois), is the most seismically active area in North America east of the Rocky Mountains. This area generated a huge series of earthquakes between 1811 and 1812 that altered the course of the Mississippi River. Experts believe that the New Madrid region has been responsible for earthquakes of magnitude 7-8 approximately every 500 years over the past 1,200 years.

Earthquakes occur everywhere on faults within the rock, usually miles deep. Earthquakes in the New Madrid Seismic Zone occur within a large network of faults called the Reelfoot fault. The rift formed about 500 million years ago when the region stretched in a northwest-southeast direction. Along the northeast and southwest region being at least 70 kilometers (40 mi) wide and 500 kilometers (300 mi) long, rocks in the fault were slowly dropped about 1-2 kilometers (1 mi) along some faults.

That region is experiencing east-west shortening, and old faults in the Reelfoot fault are reactivated to generate earthquakes. At present, the Reelfoot fault and the New Madrid seismic zone lie 2,000 kilometers (1,200 mi) from the nearest plate boundary, which is in the Caribbean Sea.

The network of faults in the seismic zone is buried under hundreds to thousands of feet of sand and mud. Four of the largest faults have been identified as alignments with abundant small earthquakes, and movements along two of these faults blocked rivers and created lakes during the earthquakes of 1811-1812. A few deeply buried faults were discovered during oil and gas exploration, and some small faults were identified from geological maps. However, many earthquakes occur far from the few known faults, so there must be additional unknown faults that can generate quakes in the seismic zone. Unfortunately, the best comprehensive guide to seismic hazards in the New Madrid seismic zone is the earthquakes themselves.

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