The new madrid fault zone

Several methods have been used to make estimates. Woodland ceramics are characterized by grog ground up potsherds or fired clay and sand tempering; whereas, Mississippian ceramics are characterized by shell tempering.

Although Memphis is likely to be the focus of major damage in the region, St. The earthquakes caused many types of ground failures including landslides along the Mississippi River bluffs from Mississippi to Kentucky.

Modern society is highly dependent on our manmade structures and infrastructure. Knowledge about some of the NMSZ faults is obtained by seismograph recordings of the frequent small earthquakes. Like other rift zones, the Reelfoot Rift is a sunken linear valley bounded by normal faults.

These observations support the interpretation that the prehistoric events were similar in location and magnitude to the earthquakes and also suggests that they too were earthquake sequences. Louis, Missouri, and km to the south near the mouth of the Arkansas River.

So what would happen if an 8.

New Madrid Seismic Zone Maps

Missouri geology, formation Considerable interest has developed recently from media reports that the New Madrid seismic zone may be shutting down. Radiocarbon dating of charcoal in the soil horizon buried by the sand blow indicates that it formed after A.

At the time of the quake, it was the biggest recorded quake with an epicenter in Illinois in that state's recorded history.

1811–12 New Madrid earthquakes

Microseismic earthquakes magnitude less than 1. If they do exist there is no easy way to locate them. Numerous large sand blows over a wide area were created by strong ground shaking during the earthquakes. Just remember what happened in Haiti.

Archaeology has played an important role in recognizing and dating prehistoric earthquake-induced liquefaction features in the New Madrid region. Geological Survey, more than measurable earthquakes have been recorded in central Arkansas just since September.

Earthquake Hazards near the New Madrid Fault Zone

Seven fault segments are recognized by micro seismicity and geomorphology. Radiocarbon dating of plant remains is the most commonly used dating technique in paleoseismology. The last major earthquake to hit the region was a 5. Earthquake-induced liquefaction features are distinctive and form as the result of strong ground shaking.

Although there are uncertainties regarding their age ranges, certain pottery and point types, as well as plant remains, are considered diagnostic of various cultural periods. Paleoseismology is the study of the timing, location, and magnitude of prehistoric earthquakes preserved in the geologic record.

One account of this phenomena stated that the Pemiscot Bayou "blew up for a distance of nearly fifty miles.

The New Madrid Seismic Zone

In the New Madrid region, sand blows can still be seen on the surface today. During the process of continental rifting, a deep valley formed that is bounded by faults and known as the Reelfoot rift.

It shows 20 localities where geologists have found and published their findings on faults or evidence of large earthquakes from sand blows; see image to the right.

Photograph of some diagnostic artifact types in New Madrid region: The trends indicate a four-segment, zig-zag fault system with a total length of about miles stretching from Marked Tree, Arkansas northeastward through Missouri, Tennessee and Kentucky to Cairo, Illinois.

In this way, sand blows across the New Madrid region were found to have formed during earthquakes about A.

Science of the New Madrid Seismic Zone

The zone which is colored in red on the map is called the New Madrid Seismic Zone. New forecasts estimate a 7 to 10 percent chance, in the next 50 years, of a repeat of a major earthquake like those that occurred in –, which likely had magnitudes of between and The New Madrid Seismic Zone (NMSZ) is the most active seismic area in the United States, east of the Rocky Mountains.

The NMSZ is located in southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky and southern Illinois. Earthquakes in the New Madrid Fault Zone.

The New Madrid fault zone (NMFZ) is a long-established weakness in the Earth’s crust in the central and eastern US where earthquakes have occurred for hundreds of millions of years.

The History of New Madrid Seismic Zone (NMSZ) Earthquakes The first known written record of an earthquake felt in the NMSZ was from a French missionary traveling up the Mississippi with a. The New Madrid Seismic Zone (NMSZ) is the most active seismic area in the United States, east of the Rocky Mountains.

The NMSZ is located in southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky and southern Illinois. 20 Cool Facts About the New Madrid Seismic Zone Poster. Summarizes a few of the more significant facts about the series of large earthquakes that struck the New Madrid seismic zone of southeastern Missouri, northeastern Arkansas, and adjacent parts of Tennessee and .

The new madrid fault zone
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New Madrid Seismic Zone - maps of past quake activity