new madrid earthquake 1811 magnitude

In addition, Lake St. Francis in Arkansas, a water body formed by subsidence that followed earlier earthquakes associated with the NMSZ, expanded. New Madrid resident Eliza Bryan vividly recalled the awful noises of the first shocks replete with the distant reverberations of hoarse and vibrating thunder, the cracking sounds of falling trees, and the river’s thunderous roar, all punctuated by the smell of sulfur. Copyright © 2020 State Historical Society of Missouri. In the spring of 1815, speculators poured into the New Madrid area seeking to purchase titles to damaged lands from unsuspecting residents before they learned about the new federal compensation law. Boatman on the river reported the riverbed rose up to 15 feet causing the Mississippi to flow backwards and create two temporary waterfalls. The 1811–12 New Madrid earthquakes were an intense intraplate earthquake series beginning with an initial earthquake of moment magnitude (7.5 -7.9) on December 16, 1811 followed by a moment magnitude 7.4 aftershock on the same day. Although the relief measure had been designed to alleviate suffering in the devastated region, most Missourians believed that the law’s principal beneficiaries had been the speculators. Flatboat operators reported that the flow of the Mississippi River was suddenly reversed; however, scientific studies performed since that time note that the tremors produced northward-moving water waves that gave the illusion that the river reversed its course. NEW MADRID EARTHQUAKE 1811-1812. Three of the earthquakes are on the list of America's top earthquakes: the first one on December 16, 1811, a magnitude of 8.1 on the Richter scale; the second on January 23, 1812, at 7.8; and the third on February 7, 1812, at as much as 8.8 magnitude. Following is a short summary of the New Madrid Earthquakes that occurred between December 16, 1811 to February 7, 1812. A second series of tremors started on January 23, 1812, and the final and most severe set of shocks followed on February 7. Bulletin of the Seismological Society of America, 92(8), 3259-3268. Three of the earthquakes are on the list of America’s top earthquakes: the first one on December 16, 1811, a magnitude of 8.1 on the Richter scale; the second on January 23, 1812, at 7.8; and the third on February 7, 1812, at as much as 8.8 magnitude. It was followed by at least three large aftershocks with magnitudes that ranged from 6.0 to 7.0 over the course of the next 48 hours. The … According to his reckoning, the earth had become lodged between the comet’s two horns and was now attempting to dislodge itself. They were among the most intense earthquakes in US history and by far the largest to occur east of the Rocky Mountains. Abstract Continental North America's greatest earthquake sequence struck on the western frontier of the United States. Columbia: University of Missouri Press, 1981. Lorenzo Dow in 1816, describing the earthquake as eye-witness. The backwoods claimant of spiritual knowledge feared that these ominous occurrences might portend the approach of the end times. Citation Hough, S. E. (2002). He rushed on deck, where he and his anxious fellow passengers sought to determine the source of their peril. The law limited such claimants to 640 acres of new land, and it prohibited them from relocating on mineral lands. Nuttli, O. W. (1973). The New Madrid fault system was responsible for the 1811–12 New Madrid earthquakes, and has the potential to produce large earthquakes in the future. More-precise figures have been presented by the United States Geological Survey (USGS) Earthquake Hazards Program: magnitude 7.7 for the December earthquake and magnitudes 7.5 and 7.7 for the January and February earthquakes, respectively. No appreciable damage to residences was reported; however, landscape changes, similar to those that occurred during the December 16 event, are thought to have taken place. The fault line runs some 150 miles from Marked Tree, Arkansas, to Cairo, Illinois, passing through southeast Missouri. Although many people think of California’s San Andreas fault, which birthed the San Francisco earthquake of 1906, as the most dangerous in North America, the quakes from 1811 to 1812 that erupted from the New Madrid Seismic Zone were the most destructive. At dawn’s first light Pierce beheld the full extent of devastation wrought by the nighttime shocks: “the earth, river &c torn with furious convulsions, opened in huge trenches whose deep jaws were instantaneously closed: there through a thousand vents sulphureous streams gushed from its very bowels leaving vast and almost unfathomable caverns. The number of lives lost from the earthquakes remains unknown; however, scholars note that the number was probably not great, because the region had only a sparse rural population. The New Madrid region continues to have the highest level of seismicity activity in the United States east of the Rockies. The January 23 event was the smallest of the three principal earthquakes. ed. All rights reserved. This would make a total of seven earthquakes of magnitude M6.0-7.5 occurring in the period December 16, 1811 through February 7, 1812. He serves currently as the editor of Earth and life sciences, covering climatology, geology, zoology, and other topics that relate to... Map of the New Madrid earthquakes of 1811–12. There were thousands of aftershocks, of which 1,874 were large enough to be felt in Louisville, Kentucky, about 190 miles (300 km) away. New Madrid earthquakes of 1811–12 - New Madrid earthquakes of 1811–12 - Possible causes of the New Madrid earthquakes: Over the past 4,500 years, a number of major earthquakes of magnitude 7.0 to 8.0 occurred in the NMSZ. These are estimated at between 7 and 8 on the richter scale. Another local citizen echoed her sentiments: “we were awakened by a most tremendous noise, while the house danced about and seemed as if it would fall on our heads.” As the earthquakes persisted, the river town’s terrified inhabitants fled their rolling and jostling homes and established encampments on higher ground to avoid the dangers of flooding. And far beyond, too: at magnitude 8.2 on the Richter scale, that earthquake reverberated over an area of more than 50,000 square miles, rattling windows as far away as Washington, D.C., and New Orleans. The temblors were felt far beyond New Madrid and its environs. Structural damage also occurred in St. Louis, Missouri, where several chimneys fell because of the ground vibration. Ground motions from the three principal events were felt in places as far away as Canada, New England, and the coast of South Carolina. When John Bradbury entered a house near the Chickasaw Bluffs in which there was an open Bible on the table, one of the occupants attributed the cause of the recurring shocks to the Great Comet of 1811 that had appeared a few months earlier. Possible causes of the New Madrid earthquakes, https://www.britannica.com/event/New-Madrid-earthquakes-of-1811-1812, USGS Earthquake Hazards - The New Madrid Seismic Zone. Damage to the landscape included the warping of the ground through subsidence (sinking) and uplift, sand blows, ground cracking, landslides, and stream bank calving. Get exclusive access to content from our 1768 First Edition with your subscription. They argue that the three, possibly four, M7–8 New Madrid earthquake sequences prior to 1811–1812 that occurred in about A.D. 1450, A.D. 900, and A.D. 300 (Tuttle et al., 2002) were transient in nature, andthusconflictwiththemodelusedinstandardhazardcal- culations. We reexamine original felt reports from the 1811-1812 New Madrid earthquakes … Our editors will review what you’ve submitted and determine whether to revise the article. John P. Rafferty writes about Earth processes and the environment. In 1815, Congress belatedly authorized persons owning lands damaged by the New Madrid earthquakes to relocate at no charge on the same quantity of land on any US public lands available for sale. The New Madrid Earthquakes. On land the impact of the earthquakes was no less horrific. The strongest aftershock, a magnitude-7.0 tremor that became known as the “dawn aftershock,” occurred later that day at 7:15 am. Map of the New Madrid earthquakes of 1811–12. Like the main shock, however, seismic waves from this event were also felt in cities along the Eastern Seaboard. The waters of the Mississippi rose and fell like a great tide. John Bradbury, the English naturalist and explorer of North America’s interior regions, had no such hesitation about the cause of his boat’s sudden and powerful convulsions on that fateful night. Amid the deafening din of crashing trees, collapsing riverbanks, and screaming wild birds, he sought to reassure the frightened crewmen eager to abandon the boat for the perceived safety of the shore. Those initial tremors and the sporadic ones that followed for nearly two months reshaped the landscape, altered regional settlement patterns, and prompted unnerved residents to contemplate the mysterious forces of nature capable of wreaking so much havoc. Rev. Scholars do agree, however, that the New Madrid earthquakes were the strongest such events recorded in North America east of the Rocky Mountains. Omissions? A series of minor earth tremors (maximum magnitude of just 2.6) have not so much shaken as shivered the Mississippi valley between Paducah and Memphis over the past 30 days. Since 1812, frequent smaller earthquakes have been recorded in the area. The Mississippi Valley Earthquakes of 1811 and 1812: Intensities, Ground Motion, and Magnitudes. St. Louis, farther removed from the epicenter, escaped with only toppled chimneys and a few cracked stone and brick walls. The US government did not provide victims of the destructive earthquakes with relief until the War of 1812 had ended. The shock, whose epicentre was also located near New Madrid, Missouri, shook the region at 3:45 am and resulted in the destruction of New Madrid. Although no instrumental data are availa In Louisville, Kentucky, a man who had homemade recording instruments reported a total of 1,874 shocks between December 11, 1811, and March 16, 1812. William Leigh Pierce, a literate twenty-one-year-old traveler, was en route to New Orleans on a flatboat in December 1811 when a violent and convulsive agitation awakened him in the dead of night. The December 1811 earthquakes were merely a prelude to what lay ahead. This region had 4 major 8.0+ magnitude earthquakes from December 1811-February 1812, during the Dalton Minimum (which included the “Year Without a Summer” of 1816), as well as during other periods of intense seismic activity during solar grand minima. Image credit: USGS. The location of the earthquake’s epicentre is controversial, but it is thought to have been located in the vicinity of New Madrid, Missouri, along a fault that runs perpendicular to the Reelfoot Fault. By late spring the aftershocks had gradually diminished, but in the forlorn New Madrid district, only the hardiest souls remained. When the nearly one hundred refugees reached New Madrid on Christmas Eve, they were dismayed to find its inhabitants camping in tents in open fields. Large waves formed on the water that capsized numerous boats and thrust others onto the land. Since the rocks in the eastern United States have few active faults to interrupt the propagation of seismic waves, ground vibrations from earthquakes generated in the region may travel thousands of miles. Huge cracks split the ground. The exodus of the area’s inhabitants alarmed territorial secretary Frederick Bates, who worried that with all of the adverse publicity about earthquakes, Indians, and epidemics, Missouri would in a few years “be nothing but a place of exile for Robbers & Outlaws.” Bates exhibited no such concern for Native Americans previously displaced from their eastern homelands and now forced to move for a second time to escape their suddenly uninhabitable lands along the St. Francis River. It probably had a magnitude of 7.5-7.9 on the Richter scale. In the most seriously impacted areas, raised or sunken lands, fissures, sand blows, and landslides were commonplace. Explains differences, and Mercalli intensity scale. Landslide trench and ridge in the Chickasaw Bluffs east of Reelfoot Lake, Tennessee, that resulted from the New Madrid earthquakes (1811–12). 1812, January 23, 15:00 UTC, New Madrid, Missouri Magnitude ~7.0 - 7.8 This is the third principal shock of the 1811-1812 sequence. Reelfoot Lake, near Tiptonville, Tennessee. James Madison is said to have felt the seismic waves arriving in Washington, D.C. During the early hours of December 16, 1811, a series of violent shakes roused inhabitants of the mid-Mississippi valley from their nighttime slumbers. Research indicates that the 1811–1812 New Madrid earthquake sequence was preceded by at least two similar earthquake sequences in about 1450 AD and 900 AD, and that over the past 5,000 years or so, other large earthquakes have also occurred in the region surrounding the main area of the currently active New Madrid seismic zone. Bradbury, who viewed these events from a scientific perspective, chose not to challenge the settler’s firmly held beliefs. The magnitude of the December 16, 1811, event ranged from 6.7 to 8.1, whereas the ranges for the earthquakes of January 23 and February 7, 1812, were 6.8–7.8 and 7.0–8.8, respectively. New Madrid, Territory, Missouri, March 22, 1816. The potential for earthquakes in the New Madrid region continues to the present day. The third principal earthquake, on February 7, however, matched or exceeded the strength and severity of the December 16 event. Over the years, estimates have placed the 1811-12 quakes’ magnitudes anywhere from under 7.0 to 8.5—an enormous range given that one additional unit … Joseph Charless, the editor of the Missouri Gazette, momentarily thought that a volcanic eruption farther west might have been responsible for the clamor of windows, doors, and furniture in motion that interrupted his sleep. Between December 16, 1811, and February 7, 1812, seven earthquakes of magnitude 6.0 to 7.5 on the Richter scale and numerous lesser aftershocks ravaged the affected area. These events include clusters of large earthquakes that have been dated to 2350 bce, 900 ce, and 1450 ce. The main shock occurred at 9:15 am, and its magnitude was estimated at 7.5. The geologic record of pre-1811 earthquakes reveals that the New Madrid seismic zone has repeatedly produced sequences of major earthquakes, including several of magnitude 7 to 8, over the past 4,500 years. Published March 13, 2020; Last updated March 19, 2020, Creative Commons Attribution-NonCommerical-ShareAlike 4.0 International (CC BY-NC-SA 4.0), The encyclopedia is freely provided with support from. There were two other large earthquakes- one on January 23, 1812 and February 7, 1812. The epicentre of the aftershock is a matter of some debate; some Earth scientists noted that it was located in northeastern Arkansas, whereas others maintained that it was located in northwestern Tennessee near the southern end of the Reelfoot Fault, a large fault running northwest-southeast within the Reelfoot Rift. The main shock that occurred at 2:15 am on December 16, 1811, was a result of slippage along the Cottonwood Grove Fault in northeastern Arkansas. Some pursued the combative intertribal militancy favored by Tecumseh and the Shawnee Prophet Tenskwatawa, while others opted for more accommodationist strategies true to their own unique cultural frames of reference. New Madrid, Missouri, was the biggest settlement in the region at the time of the quakes, and the surrounding land were devastated in 1811-12. Please read this article describing the 1811–1812 New Madrid earthquake sequence, then proceed with the rest of the lesson. 69, passed by the 13th Session of Congress on February 25, 1814, … Since the area was sparsely populated there are few eye-witness accounts. The first of these happened December 16, 1811. Penick, James Lal, Jr. Initially, they suspected that hostile Indians had caused the mischief by unleashing their tethered vessel from its moorings, but a succession of shocks soon alerted them to the true source of the mayhem. A slightly different version of this essay, “Turbulence and Terror: The New Madrid Earthquakes, 1811–1812,” appeared in the November 2017 issue of We Proceeded On, published by the Lewis and Clark Trail Heritage Foundation. It appears here by permission of the author and the original publisher. Magnitude estimates for each of the three events associated with the 1811–12 earthquake sequence vary widely, largely because they rely on historical accounts and analyses of the present-day landscape rather than data provided by modern seismic instrumentation. Soil liquefaction caused large sand blows that fouled farmland in Missouri, Tennessee, and Arkansas. https://earthquake.usgs.gov/earthquakes/events/1811-1812newmadrid/summary.php. Some scientists estimate the February quake at 8.8 magnitude. And finally, I have a letter Eliza Bryan wrote to Rev. In the known history of the world, no other earthquakes have lasted so long or produced so much evidence of damage as the New Madrid earthquakes. Hundreds of aftershocks were felt in 1813. US Geological Survey. The most seriously affected areas were in southeastern Missouri, northeastern Arkansas, southwestern Kentucky, and northwestern Tennessee. Hancock, Jonathan Todd. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Residents throughout the Ohio valley and people in places as distant as New York City and Charleston, South Carolina, experienced the tremors in varying degrees. The upthrusting of the land some 15 miles (24 km) to the south of the epicentre pushed water into a basin that dropped 5 to 20 feet (1.5 to 6 metres) and created Reelfoot Lake, which is located near Tiptonville, Tennessee. The frontier was not then California but the valley of the continent's greatest river, the Mississippi, and the sequence was the New Madrid earthquakes of the winter of 1811–1812. Of greater importance is the resulting legislation, Bill No. They were among the most intense earthquakes in US history and by far the largest to occur east of the Rocky Mountains. There also was an aftershock of magnitude 7.4 on the same day. The Lost History of the New Madrid Earthquakes. Some areas sank, while others were uplifted. A second earthquake of the same size hit six hours later, again shaking the ground more than 1,000 miles away. Magnitude: December 16, 1811: 2 A.M. 8.2: January 23, 1812: 8.1: February 7, 1812: 3:15 A.M. 8.3: The estimated locations of the epicenters of these earthquakes are shown below: Several towns, including New Madrid, shown on the above map were destroyed by the quakes. Shortly after the earthquake began, ground shaking was felt as far away as Canada in the north and the Gulf Coast in the south. This shock followed the first earthquake by six hours and was similar in intensity; 23 January 1812 (7.3-7.6), epicenter in the Missouri bootheel; 7 February 1812 (7.5-8.0), epicenter near New Madrid The recent minor tremors of the Mississippi valley recall the New Madrid earthquakes of 1811-12. See Magnitude - replaces Richter scale. The location of this event is not well constrained, but the available accounts suggest an epicenter beyond the southern end of the New Madrid Seismic Zone. Bulletin of the Seismological Society of America, 63(1), 227–248. Updates? Magnitude Estimates of Two Large Aftershocks of the 16 December 1811 New Madrid Earthquake. This one involved the New Madrid fault and may have placed stress on a neighboring fault known as he Reelfoot Fault. The active faults in the New Madrid Seismic Zone are difficult to assess because they are hidden beneath thick layers of soft river-deposited soils, but current US Geological Survey maps show it to be a high hazard zone comparable to those in California. Reports indicate that between December 1811 and March 1812, there were over 2000 earthquakes and aftershocks along the New Madrid fault. Many geologists now believe the largest New Madrid quakes of 1811-12 were high 7 magnitude instead of 8's. American evangelicals employed earthquakes as signs of God’s wrath for sinful behavior and a catalyst for Christian conversion and repentance. A number of earthquakes that happened near the town of New Madrid, in late 1811, and early 1812 are known as the 1811–12 New Madrid earthquakes today. 16 December 1811 (magnitude 7.5-7.9), epicenter in northeast Arkansas; 16 December 1811, aftershock (7.4), epicenter in northeast Arkansas. The 1811-1812 New Madrid earthquake sequence has been described in numerous ways: by Mitchell (1815) in terms of a series of disconnected historical vignettes, by Fuller (1912) in terms of far-field intensities and near-field geomorphic effects, by Nuttli (1973) anf magnitude, and by Johnston (1996c) in terms of seismic moment. By Barbara Lewellen Introduction. “A World Convulsed: Earthquakes, Authority and the Making of Nations in the War of 1812 Era.” PhD diss., University of North Carolina at Chapel Hill, 2013. Between December 16, 1811, and February 7, 1812, seven earthquakes of magnitude 6.0 to 7.5 on the Richter scale and numerous lesser aftershocks ravaged the affected area. The maximum documented intensity for both earthquakes on December 16, 1811, is MM intensity VIII at Richmond, Kentucky. Dear Sir: On December 16, 1811, the 400 residents of New Madrid, Missouri, were shaken out of their beds at two in the morning by a violent earthquake. They remain the most powerful earthquakes to hit the contiguous United States east of the Rocky Mountains in recorded history. Despite the strength of the tremors, only minor damage to human-made structures was reported: from collapsing chimneys, falling trees, and cracking timbers in houses. of the 1811-1812 New Madrid earthquakes Susan E. Hough U.S. Geological Survey, Pasadena, California John G. Armbruster and Leonardo Seeber Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York Jerry F. Hough Department of Political Science, Duke University, Durham, North Carolina Abstract. New Madrid earthquakes of 1811–12, series of three large earthquakes that occurred near New Madrid, Missouri, between December 1811 and February 1812. 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