These levels are reflected in the National Seismic Hazard Maps, which represent the products of a long consensus building process. […] Military trainings may have triggered some. It is southwest of the Wabash Valley Seismic Zone. Be curious! (nothing against ‘Strange Sounds’ of course, i’m happy to see the article, it’s due, that’s for sure) But, these can be kinda’ predicted now with fairly good precision, thanks to Dutchsinse. )Earthquake chronology for New Madrid seismic zone from dating and correlation of liquefaction features at sites (listed at top) along NE-SW transect. al., 1984). These observations support the interpretation that the prehistoric events were similar in location and magnitude to the 1811-1812 earthquakes and also suggests that they too were earthquake sequences. Sand blows composed of several layers that fine upward from coarse sand to silt and capped by clay probably formed as a result of multiple earthquakes. This implies a recurrence interval of about 500 years.We have learned a tremendous amount about the New Madrid seismic zone since 1985. In the New Madrid region, sand blows can still be seen on the surface today. (Public domain. Studies focusing on earthquake-induced liquefaction features utilized archaeology and radiocarbon dating to estimate the ages of liquefaction features, and thus, the timing of the earthquakes that caused them. This process is accompanied by high pore water pressures that can force sand, water, and mud upward, often forming the signature sand blows of the New Madrid seismic zone. The faults that produce earthquakes are not easy to see at the surface in the New Madrid region because they are eroded by river processes and deeply buried by river sediment. […]This post has a great graphic! Putting down roots in earthquake country-Your handbook for earthquakes in the Central United States; 2011; GIP; 119; Contributors: Dart, Richard; McCarthy, Jill; McCallister, Natasha; Williams, Robert A. Earthquake Hazard in the New Madrid Seismic Zone Remains a Concern; 2009; FS; 2009-3071; Frankel, A. D.; Applegate, D.; Tuttle, M. P.; Williams, R. A. to 1670 A.D. We also know there are no such plates in the central United States.Yet that part of the country has had major earthquakes in three zones: The mid-continent faults rupture less often; New Madrid gets the shakes maybe 200 times a year, about a tenth the number in California.And earthquakes in the central United States tend to be smaller. Sand blows found below Native American mounds and occupation horizons no doubt formed prior to 1811 because few Native Americans lived in the area after the 17th Century. When they are, the USGS sometimes has held workshops to try to come to a consensus and at other times has announced our own internal consensus. Viewed from above, sand blow have circular, elliptical, and linear shapes and can range up to tens of meters in width and hundreds of meters in length. The New Madrid Earthquake That Will Divide The United States In Half. The presence of Native Americans is still evident today in the occasional mound not yet destroyed by modern agricultural practices and the abundant potsherds, lithic tools and points, and bone fragments found in plowed fields and river and ditch cutbanks.
Here, a large quake would be felt 1,200 miles away in Canada.So you better watch out! For example, Bell Plain, Campbell Appliqué, and Parkin Punctate pottery and Nodena points are diagnostic of the Late Mississippian period; Old Town Red pottery and Madison points are diagnostic of the Middle Mississippian period; Varney Red Filmed pottery is diagnostic of the Early Mississippian period; and Barnes pottery and Table Rock stemmed points are diagnostic of the Late Woodland period. In a report filed in November 2008, the U.S. Federal Emergency Management Agencywarned 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 would cause damage to tens of thousands of stru… )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. […][…] But the New Madrid Seismic Zone, a 150 miles long fault line crossing five states – Illinois, Missouri, Arkansas, Kentucky, Tennessee is also long overdue. Wisconsin valley train deposits formed during the glacial period from 10,000-60,000 years ago, and the Holocene meander belt deposits were laid down during the past 10,000 years.The Mississippi embayment is underlain by Paleozoic sedimentary rocks up to 570 millions years old.
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