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The New Madrid Seismic Zone (pronounced / /), sometimes called the New Madrid Fault Line, is a major seismic zone and a prolific source of intraplate earthquakes (earthquakes within a tectonic plate) in the southern and midwestern United States, stretching to the southwest from New Madrid, Missouri.
The New Madrid fault system was responsible for the 1811–1812 New Madrid earthquakes and may have the potential to produce large earthquakes in the future. Since 1812, frequent smaller earthquakes have been recorded in the area.
Geographic extent 
The 150-mile (240 km) long fault system, which extends into five states, stretches southward from Cairo, Illinois; through Hayti, Caruthersville and New Madrid in Missouri; through Blytheville into Marked Tree in Arkansas. It also covers a part of West Tennessee, near Reelfoot Lake, extending southeast into Dyersburg.
Most of the seismicity is located between 3 and 15 miles (4.8 and 24 km) beneath the Earth's surface.
Earthquake history 
The zone had four of the largest North American earthquakes in recorded history, with moment magnitudes estimated to be as large as 8.0, all occurring within a three-month period between December 1811 and February 1812. Many of the published accounts describe the cumulative effects of all the earthquakes (known as the New Madrid Sequence); thus finding the individual effects of each quake can be difficult. Magnitude estimates and epicenters are based on interpretations of historical accounts and may vary.
Prehistoric earthquakes 
Because uplift rates associated with large New Madrid earthquakes could not have occurred continuously over geological timescales without dramatically altering the local topography, studies have concluded that the seismic activity there can not have gone on for longer than 64,000 years, making the NMSZ a young feature, or earthquakes and the associated uplift migrate around the area over time, or that the NMSZ has short periods of activity interspersed with long periods of quiet. Archeological studies have found from studies of sand blows and soil horizons that previous series of very large earthquakes have occurred in the NMSZ in recent prehistory. Based on artifacts found buried by sand blow deposits and from carbon-14 studies, previous large earthquakes like those of 1811–1812 appear to have happened around AD 1450 and around AD 900, as well as approximately AD 300. Evidence has been found for an apparent series of large earthquakes around 2350 BC. About 80 km southwest of the presently-defined NMSZ but close enough to be associated with the Reelfoot Rift, near Marianna, Arkansas, two sets of liquefaction features indicative of large earthquakes have been tentatively identified and dated to 3500 B.C. and 4800 B.C. These features were interpreted to have been caused by groups of large earthquakes timed closely together.
Dendrochronology (tree ring) studies conducted on the oldest bald cypress trees growing in Reelfoot Lake found evidence of the 1811–1812 series in the form of fractures followed by rapid growth after their inundation, whereas cores taken from old bald cypress trees in the St. Francis sunklands showed slowed growth in the half century that followed 1812. These were interpreted as clear signals of the 1811–1812 earthquake series in tree rings. Because the tree ring record in Reelfoot Lake and the St. Francis sunklands extend back to A.D. 1682 and A.D. 1321, respectively, Van Arsdale et al. interpreted the lack of similar signals elsewhere in the chronology as evidence against large New Madrid earthquakes between those years and 1811.
December 25, 1699 
The first known written record of an earthquake felt in the NMSZ was from a French missionary traveling up the Mississippi with a party of explorers. At 1 PM, on Christmas Day 1699, at a site near the present-day location of Memphis, the party was startled by a short period of ground shaking.
1811–1812 earthquake series 
- December 16, 1811, 0815 UTC (2:15 a.m.); (M ~7.2 – 8.2) epicenter in northeast Arkansas; it caused only slight damage to man-made structures, mainly because of the sparse population in the epicentral area. The future location of Memphis, Tennessee was shaken at Mercalli level nine intensity. A seismic seiche propagated upriver and Little Prairie was destroyed by liquefaction. Local uplifts of the ground and water waves moving upstream gave the illusion that the river was flowing backwards.
At New Madrid, trees were knocked down and riverbanks collapsed. This event shook windows and furniture in Washington, D.C., rang bells in Richmond, Virginia, sloshed well water and shook houses in Charleston, South Carolina, and knocked plaster off of houses in Columbia, South Carolina. In Jefferson, Indiana, furniture moved and in Lebanon, Ohio, residents fled their homes. Observers in Herculaneum, Missouri, called it "severe" and claimed it had a duration of 10–12 minutes.
Aftershocks were felt every six to ten minutes, a total of 27, in New Madrid until what was called the Daylight Shock, which was of the same intensity as the first. Many of these were also felt throughout the eastern US, though with less intensity than the initial earthquake.
- December 16, 1811, the Daylight Shock, 1415 UTC (8:15 a.m.); (M ~7.2 – 8.2) epicenter in northeast Arkansas; This shock followed the first earthquake by six hours and was similar in intensity.
- January 23, 1812, 1500 UTC (9 a.m.); (M ~7.0 – 8.0) epicenter in the Missouri Bootheel. The meizoseismal area was characterized by general ground warping, ejections, fissuring, severe landslides, and caving of stream banks. Johnston and Schweig attributed this earthquake to a rupture on the New Madrid North Fault. This may have placed strain on the Reelfoot Fault.
- February 7, 1812, 0945 UTC (4:45 a.m.); (M ~7.4 – 8.6) epicenter near New Madrid, Missouri. New Madrid was destroyed. At St. Louis, Missouri, many houses were severely damaged, and their chimneys were toppled. This shock was definitively attributed to the Reelfoot Fault by Johnston and Schweig. It was uplift along this reverse fault segment, in this event, that created waterfalls on the Mississippi River, disrupted the Mississippi River at Kentucky Bend, created a wave that propagated upstream and caused the formation of Reelfoot Lake.
Hundreds of aftershocks followed over a period of several years. Aftershocks strong enough to be felt occurred until the year 1817. The largest earthquakes to have occurred since then were on January 4, 1843, and October 31, 1895, with magnitude estimates of 6.0 and 6.6 respectively.
Modern activity 
The biggest quake since 1811–1812 was a 6.6-magnitude quake on October 31, 1895, with an epicenter at Charleston, Missouri. The quake damaged virtually all buildings in Charleston, creating sand volcanoes by the city, cracked a pier on the Cairo Rail Bridge and toppled chimneys in St. Louis, Missouri, Memphis, Tennessee, Gadsden, Alabama and Evansville, Indiana.
The next biggest quake was a 5.4-magnitude quake (although it was reported as a 5.5 at the time) on November 9, 1968, near Dale, Illinois. The quake damaged the civic building at Henderson, Kentucky and was felt in 23 states. People in Boston said their buildings swayed. It is the biggest recorded quake with an epicenter in Illinois in that state's recorded history.
Instruments were installed in and around the area in 1974 to closely monitor seismic activity. Since then, more than 4,000 earthquakes have been recorded, most of which were too small to be felt. On average, one earthquake per year is large enough to be felt in the area.
The New Madrid Seismic Zone is made up of reactivated faults that formed when what is now North America began to split or rift apart during the breakup of the supercontinent Rodinia in the Neoproterozoic Era (about 750 million years ago). Faults were created along the rift and igneous rocks formed from magma that was being pushed towards the surface. The resulting rift system failed but has remained as an aulacogen (a scar or zone of weakness) deep underground. Another unsuccessful attempt at rifting 200 million years ago created additional faults, which made the area weaker. The resulting geological structures make up the Reelfoot Rift, and have since been deeply buried by younger sediments. But the ancient faults appear to have made the rocks deep in the Earth's crust in the New Madrid area mechanically weaker than much of the rest of North America.
This weakness, possibly combined with focusing effects from mechanically stronger igneous rocks nearby, allows the relatively small east-west compressive forces that exist in the North American plate to reactivate old faults, making the area prone to earthquakes.
Since other rifts are known to occur in North America's stress environment but not all are associated with modern earthquakes, (for example the Midcontinent Rift System that stretches from Minnesota to Kansas), other processes could be at work to locally increase mechanical stress on the New Madrid faults. Stress changes associated with bending of the lithosphere caused by the melting of continental glaciers at the end of the last Ice Age, has been considered to play a role, as well as downward pull from sinking igneous rock bodies below the fault. It has also been suggested that some form of heating in the lithosphere below the area may be making deep rocks more plastic, which concentrates compressive stress in the shallower subsurface area where the faulting occurs. There may be local stress from a change in the flow of the mantle beneath the NMSZ, caused by the sinking Farallon Plate, according to one model.
When epicenters of modern earthquakes are plotted on a map, three trends become apparent. First is the general northeast-southwest trend paralleling the trend of the Reelfoot Rift, in Arkansas, south of where the epicenters turn northwest. This is a right-lateral strike-slip fault system parallel to the Reelfoot Rift.
The second is the southeast to northwest trend that occurs just southwest of New Madrid. This trend is a stepover thrust fault known as the Reelfoot Fault, associated with the Tiptonville dome and the impoundment of Reelfoot Lake. Epicenter locations on this fault are more spread out because the fault surface is inclined and dips into the ground, towards the south, at around forty degrees. Slip is towards the northeast. Motion on this fault in the 1811–1812 series created waterfalls on the Mississippi.
The third trend, extending northeast from the northwestern end of the Reelfoot Fault is another right-lateral strike-slip fault known as New Madrid North.
Potential for future earthquakes 
In a report filed in November 2008, The U.S. Federal Emergency Management Agency warned that a serious earthquake in the New Madrid Seismic Zone could result in "the highest economic losses due to a natural disaster in the United States," further predicting "widespread and catastrophic" damage across Alabama, Arkansas, Illinois, Indiana, Kansas, Kentucky, Mississippi, Missouri, Oklahoma, Texas, and particularly Tennessee, where a 7.7 magnitude quake or greater would cause damage to tens of thousands of structures affecting water distribution, transportation systems, and other vital infrastructure. The earthquake is expected to also result in many thousands of fatalities, with more than 4,000 of the fatalities expected in Memphis alone.
The potential for the recurrence of large earthquakes and their impact today on densely populated cities in and around the seismic zone has generated much research devoted to understanding in the New Madrid Seismic Zone. By studying evidence of past quakes and closely monitoring ground motion and current earthquake activity, scientists attempt to understand their causes and recurrence intervals.
In October 2009, a team composed of University of Illinois and Virginia Tech researchers headed by Amr S. Elnashai, funded by the Federal Emergency Management Agency (FEMA), considered a scenario where all three segments of the New Madrid fault ruptured simultaneously. The report found that there would be significant damage in the eight states studied – Alabama, Arkansas, Illinois, Indiana, Kentucky, Mississippi, Missouri and Tennessee – with the probability of additional damage in states farther from the NMSZ. Tennessee, Arkansas, and Missouri would be most severely impacted, and the cities of Memphis, Tennessee and St. Louis, Missouri would be severely damaged. The report estimated 86,000 casualties, including 3,500 fatalities; 715,000 damaged buildings; and 7.2 million people displaced, with 2 million of those seeking shelter, primarily due to the lack of utility services. Direct economic losses, according to the report, would be at least $300 billion.
Iben Browning's 1990 prediction 
Beginning in February 1989, climatologist Iben Browning – who claimed to have predicted the 1980 eruption of Mount St. Helens, and the 1989 Loma Prieta earthquake a week in advance (for which some give him credit) – predicted that there was a 50 percent probability of a magnitude 6.5 to 7.5 earthquake in the New Madrid area sometime between December 1 and December 5, 1990. The United States Geological Survey requested an evaluation of the prediction by an advisory board of earth scientists, who concluded that "the prediction does not have scientific validity." Despite the lack of scientific support, Browning's prediction was widely reported in international media, causing public alarm. The period passed with no major earthquake activity in New Madrid or along the 120-mile (190 km) fault line.
Uncertainty over potential for recurrence 
The lack of apparent land movement along the New Madrid fault system has long puzzled scientists. In 2009 two studies based on eight years of GPS measurements indicated that the faults were moving at no more than 0.2 millimeters (0.0079 in) a year. This contrasts to the rate of slip on the San Andreas Fault which averages up to 37 mm (1.5 in) a year across California.
On March 13, 2009, a research group based out of Northwestern University and Purdue University, funded by the United States Geological Survey, reported in the journal Science and in other journals that the New Madrid system may be "shutting down" and that tectonic stress may now be accumulating elsewhere. Seth Stein, the leader of the research group, published these views in a book, Disaster Deferred, in 2008. Although some of these ideas have gained some amount of acceptance among researchers, they have not been accepted by the National Earthquake Prediction Evaluation Council, which advises the USGS, or the Federal Emergency Management Agency (FEMA).
In the November 5, 2009, issue of Nature, researchers from Northwestern University and the University of Missouri said that due to the lack of fault movement, the quakes along the faults may only be aftershocks of the 1811–1812 earthquakes. Researchers say aftershocks on the San Andreas can continue for a period of up to about ten years, where fault movement averages up to 37 mm (1.5 in) a year across California.
According to the USGS, there is a broad consensus that the possibility of major earthquakes in the New Madrid Seismic Zone remains a concern, and that the GPS data do not provide a compelling case for lessening perceived earthquake hazards in the region. One concern is that there is no evidence of reduced earthquake frequency over time, as would be expected if all present-day activity were caused by aftershocks of the 1811–1812 events, another is that the 4,500 year archeological record of large earthquakes in the region is more significant than ten years of direct strain measurement. The USGS recently issued a fact sheet reiterating the estimate of a 10% chance of a New Madrid earthquake of magnitude comparable to those of 1811–1812 within the next 50 years, and a greater chance of a magnitude 6.0 earthquake in the same time frame.
Other Midwestern earthquake zones 
On April 18, 2008, there was a 5.2 earthquake with an epicenter 7 km (4.3 mi) north northeast of Bellmont, Illinois. The earthquake was about 160 miles (260 km) northeast of New Madrid. The earthquake highlighted activity on the Wabash Valley Seismic Zone fault system that extends from Gallatin County, Illinois, and White County, Illinois, and Posey County, Indiana, northeast 97 km (60 mi) and spans an area that is about 48 km (30 mi) in the Ozark dome region, which covers parts of Indiana, Kentucky, Illinois, Missouri, and Arkansas. Researchers say that at least eight earthquakes with estimated magnitude 6.5 to 7.5 have occurred in the last 20,000 years. The largest of the quakes was centered about 25 km (16 mi) west of Vincennes, Indiana, about 6,100 years ago. The fault zone is considered an aulacogen related to the New Madrid fault line. A major earthquake in this zone now could cause major damage and loss of life in Evansville and surrounding areas of southern Indiana, southern Illinois, and Kentucky.
See also 
- "Center for Earthquake Research and Information at the University of Memphis".
- Stelzer, C.D. "The earthquake hazard here may be greater than you think. And planning for it is less than you'd expect" Riverfront Times (December 15, 1999)
- Pratt, Thomas L (April–June 1994). "How old is the New Madrid Seismic Zone?". Seismological Research Letters 65 (2).
- Tuttle, Martitia P.; Schweig, Eugene S.; John D. Sims, Robert H. Lafferty, Lorraine W. Wolf, and Marion L. Haynes (August 2002). "The Earthquake Potential of the New Madrid Seismic Zone". Bulletin of the Seismological Society of America 92 (6): 2080–2089. Bibcode:2002BuSSA..92.2080T. doi:10.1785/0120010227.
- Tuttle, Martitia P.; Schweig, III, Eugene S.; Janice Campbell, Prentice M. Thomas, John D. Sims, and Robert H. Lafferty, III (July/August 2005). "Evidence for New Madrid Earthquakes in A.D. 300 and 2350 B.C". Seismological Research Letters 76 (4): 489–501. doi:10.1785/gssrl.76.4.489.
- Tuttle, MP; Al-Shukri, H; Mahdi, H (2006). "Very Large Earthquakes Centered Southwest of the New Madrid Seismic Zone 5,000–7,000 Years Ago". Seismological Research Letters 77 (6): 755. doi:10.1785/gssrl.77.6.755.
- Van Arsdale, RB; Stahle, DW; MK Cleaveland, and MJ Guccione (June 1998). "Earthquake signals in tree-ring data from the New Madrid seismic zone and implications for paleoseismicity". Geology 26 (6): 515–518. Bibcode:1998Geo....26..515V. doi:10.1130/0091-7613(1998)026<0515:ESITRD>2.3.CO;2.
- Feldman, Jay (2005). When the Mississippi Ran Backwards : Empire, Intrigue, Murder, and the New Madrid Earthquakes. Free Press. ISBN 0-7432-4278-5.
- Historic Earthquakes New Madrid Earthquakes 1811–1812 USGS
- The Enigma of the New Madrid Earthquakes of 1811–1812. Johnston, A. C. & Schweig, E. S. Annual Review of Earth and Planetary Sciences, Volume 24, pp. 339–384. Available on SAO/NASA Astrophysics Data System (ADS)
- http://earthquake.usgs.gov/regional/states/events/1811-1812.php#december_16 United States Geological Survey USGS
- The New Madrid Earthquake. USGS Professional Bulletin 494. Myron Fuller (1912) (requires LizardTech online document viewer)
- The New Madrid Earthquake. USGS Professional Bulletin 494. Myron Fuller (1912) (LizardTech online document)
- http://quake.wr.usgs.gov/prepare/factsheets/NewMadrid/ United States Geological Survey USGS
- "Historic Earthquakes: Near Charleston, Mississippi County, Missouri". United States Geological Survey. Retrieved 2009-09-23.
- "Historic Quakes: Southern Illinois 1968 11 09 17:01:40.5 UTC". United States Geological Survey. Retrieved 2009-09-23.
- "USGS Earthquake Hazards Program, Earthquake Report: Kentucky".
- Grollimund, Balz; Zoback, Mark D. (February 2001). "Did deglaciation trigger intraplate seismicity in the New Madrid seismic zone?". Geology 29 (2): 175–178. Bibcode:2001Geo....29..175G. doi:10.1130/0091-7613(2001)029<0175:DDTISI>2.0.CO;2.
- Pollitz, Fred F.; Kellogg, Louise; Bürgmann, Roland (December 2001). "Sinking Mafic Body in a Reactivated Lower Crust: A Mechanism for Stress Concentration at the New Madrid Seismic Zone". Bulletin of the Seismological Society of America 91 (6): 1882–1897. Bibcode:2001BuSSA..91.1882P. doi:10.1785/0120000277.
- Liu, L.; Zoback, M. D. (1997). "Lithospheric strength and intraplate seismicity in the New Madrid seismic zone". Tectonics 16 (4): 585–595. Bibcode:1997Tecto..16..585L. doi:10.1029/97TC01467.
- Forte, A. M.; Mitrovica, J. X.; R. Moucha, N. A. Simmons, and S. P. Grand (2007). "Descent of the ancient Farallon slab drives localized mantle flow below the New Madrid seismic zone". Geophys. Res. Lett. 34 (4): L04308. Bibcode:2007GeoRL..3404308F. doi:10.1029/2006GL027895.
- http://news.yahoo.com/s/nm/20081120/us_nm/us_earthquake_study;_ylt=AkY.pkcM1pDbSKQ7ePCNGu2s0NUE "Government warns of 'catastrophic' U.S. quake" – Reuters
- https://www.ideals.illinois.edu/handle/2142/14810 "Impact of New Madrid Seismic Zone Earthquakes on the Central USA, Vol. 1 and 2
- Glenn Fowler (July 20, 1991). "Iben Browning, 73; Researcher Studied Climate and Quakes". The New York Times. Retrieved 2 July 2011.
- Spence, William J.; Herrmann, R. B.; Johnston, A. C.; Reagor, B. G. (1993). Responses to Iben Browning's Prediction of a 1990 New Madrid, Missouri, Earthquake 248 (1083). Dept. of the Interior, U.S. Geological Survey. Retrieved 22 July 2011.
- New Madrid fault system may be shutting down – physorg.com – March 13, 2009
- Wallace, Robert E. "Present-Day Crustal Movements and the Mechanics of Cyclic Deformation". The San Andreas Fault System, California. Retrieved 2007-10-26.[dead link]
- http://esciencenews.com/articles/2009/03/13/new.madrid.fault.system.may.be.shutting.down "New Madrid Fault System May Be Shutting Down" Eureka! Science News
- Monastersky, Richard. "Nature News: Seth Stein: The Quake Killer" Nature (9 November 2011)
- "Earthquakes Actually Aftershocks Of 19th Century Quakes; Repercussions Of 1811 And 1812 New Madrid Quakes Continue To Be Felt". Science Daily. Retrieved 2009-11-04.
- ^ Wallace, Robert E. "Present-Day Crustal Movements and the Mechanics of Cyclic Deformation". The San Andreas Fault System, California. http://education.usgs.gov/california/pp1515/chapter7.html. Retrieved 2007-10-26.
- http://pubs.usgs.gov/fs/2009/3071/ Retrieved 2010-5-2
- Magnitude 5.4 – ILLINOIS – USGS.gov – Retrieved January 21, 2009
- Earthquake hits Indiana, felt by thousands in Michiana – wndu.com – April 18, 2008
- USGS New Madrid
- U.S. Geologic Survey site discusses the New Madrid seismic zone.
- Uncovering Hidden Hazards in the Mississippi Valley
- Central US Earthquake Consortium
- U. Memphis, TN, Center for Earthquake Research and Information (CERI) comprehensive references for the 1811–1812 earthquakes
- Links to eyewitness descriptions of the three 1811–12 earthquakes, and results of the earthquakes as seen in photographs of 1904.
- Your Fault, My Fault, and the New Madrid Fault
- Space geodetic evidence for rapid strain rates in the New Madrid seismic zone of Central USA (PDF)
- Boyd, K.F. (1995). Geomorphic evidence of deformation in the northern part of the New Madrid seismic zone [U.S. Geological Survey Professional Paper 1538-R]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
- Elnashai, A.S., et al. (2009). Impact of New Madrid Seismic Zone Earthquakes on the Central USA [Mid-American Earthquake Center Report 09-03]. Urbana, IL: Mid-America Earthquake Center. University of Illinois at Urbana-Champaign. http://hdl.handle.net/2142/14810.
- Langenheim, V.E. (1995). Gravity of the New Madrid seismic zone : a preliminary study [U.S. Geological Survey Professional Paper 1538-L]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
- Odum, J.K., et al. (1995). High-resolution, shallow, seismic reflection surveys of the northwest Reelfoot rift boundary near Marston, Missouri [U.S. Geological Survey Professional Paper 1538-P]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
- Potter, C.J., et al. (1995). Structure of the Reelfoot-Rough Creek rift system, fluorspar area fault complex and Hicks dome, southern Illinois and western Kentucky : new constraints from regional seismic reflection data [U.S. Geological Survey Professional Paper 1538-Q]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
- Rodriguez, B.D. (1995). Axial structures within the Reelfoot rift delineated with magnetotelluric surveys [U.S. Geological Survey Professional Paper 1538-K]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
- Stephenson, W.J., K.M. Shedlock, and J.K. Odum. (1995). Characterization of the Cottonwood Grove and Ridgely faults near Reelfoot Lake, Tennessee, from high-resolution seismic reflection data [U.S. Geological Survey Professional Paper 1538-I]. Washington, D.C.: U.S. Department of the Interior, U.S. Geological Survey.
- Center for Earthquake Research and Information at the University of Memphis. Recent central U.S. earthquakes