Thank you for taking your time to send in your valued opinion to Science X editors. Apart from any fair dealing for the purpose of private study or research, no /* 160x600, created 12/31/07 */ google_ad_client = "ca-pub-2707004110972434"; Based on the 1990 USDA Hardiness Zone Map, this interactive version covers the state of Tennessee which ranges from USDA Zone 6a to USDA Zone … The Eastern Tennessee Seismic Zone (ETSZ), a zone of small seismic faults stretching from northeastern Alabama to southwestern Virginia, may have generated earthquakes of … A combination of features convinced Cox and colleagues that they were looking at a record of past earthquakes rather than signs of an ancient landslide. While some zones, such as the New Madrid Seismic Zone, may be more widely known, others such as the East Tennessee and Central Virginia Seismic Zones can also produce damaging earthquakes at any time. A few damaging earthquakes have occurred in the ETSZ; the largest historic earthquakes measured 4.6 magnitude, occurring in 1973 near Knoxville, Tennessee and April 29, 2003 near Fort Payne, Alabama. [1] Research published in 2010 indicates a correlation between the Eastern Tennessee Seismic Zone and the New York-Alabama Lineament and suggests that earthquakes in the seismic zone originate at depth in metasedimentary gneiss.[4]. You can unsubscribe at any time and we'll never share your details to third parties. Cox said it might be possible that these large earthquakes were only active during the late Pleistocene, when seismic stresses in the crust changed with the advance and retreat of massive ice sheets. Intraplate Workshop CERI, 2015. The eastern Tennessee seismic zone is a prominent feature on this map. Using a technique called optically stimulated luminescence to assign dates to the minerals contained in sediments surrounding these seismic features, Cox and colleagues narrowed the possible ages of these earthquakes to between 25,000 and 15,000 years ago. [3], The source of seismic activity in the ETSZ is not known. Notes on seismic hazard sensitivity studies for Eastern Tennessee Seismic Zone 3 March 2008—R. google_ad_slot = "4852765988"; Why is the CO2 level lower in my house than outside? Article Id: 1) and TVA Dam Safety study (Ref. Memphis. Eastern Tennessee has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 4 earthquakes in the past 30 days; 74 earthquakes in the past 365 days Your email address is used only to let the recipient know who sent the email. The ETSZ is one of the most active earthquake zones in the eastern United States. The ETSZ is located far from edge of the North American continent and represents a mid-continent or intraplate earthquake zone. The ETSZ region is home to several nuclear power plants and hydroelectric dams related to the Tennessee Valley Authority, along with major population centers such as Knoxville and Chattanooga, making it important to determine whether the region is capable of a large damaging earthquake. Alabama sits on the edge of the Eastern Tennessee seismic zone, which extends from south west Virginia to north east Alabama, is one of the most active earthquake areas in the Southeast. google_ad_height = 90; Text is available under the CC BY-SA 4.0 license, excluding photos, directions and the map. Do equations for groundwater flow refer to water density? ... Maps of each team’s seismic sources listed in Table 1 are shown in Figures 6-11. John Bellini, a geophysicist with USGS, said “there is a history of earthquakes” in the Eastern Tennessee Seismic Zone, which extends into northwest Georgia and northeast Alabama. In historic times, the ETSZ has not produced earthquakes larger than magnitude 4.8. In the East Tennessee Seismic Zone, there have been 188 earthquakes of magnitude 2.5 or greater since measurements began in the 1970s. google_ad_client = "pub-2707004110972434"; The ETSZ is the second-most active natural seismic zone in the … At one site, a thrust fault with one meter displacement suggests that one of the earthquakes could have been magnitude 6 or even larger. The largest earthquakes in the ETSZ are the M4.6 in 1973 near Knoxville, Tennessee and the M4.6 on April 29, 2003 near Fort Payne, Alabama. Many e… Your feedback will go directly to Science X editors. Earthquakes large enough to be felt occur approximately once a year in the ETSZ. Your opinions are important to us. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization. Excessive Violence This study examines the seismic hazard at a site located in the Eastern Tennessee Seismic Zone (ETSZ) and examines the sensitivity of hazard at that site to different assumptions on seismicity in the region. The researchers are collecting data now indicating that these features cross valley floors, which "strongly corroborate the results of this paper, that these features are related to earthquakes," said Cox. We do not guarantee individual replies due to extremely high volume of correspondence. We mapped concentrations of sackungen (ridgetop spreading features) on bluffs along the eastern Mississippi River valley in northwestern Tennessee that likely form or are reactivated during large earthquakes. The Eastern Tennessee Seismic Zone (ETSZ), a zone of small seismic faults stretching from northeastern Alabama to southwestern Virginia, may have generated earthquakes of magnitude 6 or greater within the last 25,000 years, according to a study published June 27 in the Bulletin of the Seismological Society of America. See this page's contributions. The Eastern Tennessee Seismic Zone (ETSZ) is one of the most active areas in the southeastern U.S. Its known faults are generally ancient and no known active faults reach the surface.