These earthquakes took place in an area called the New Madrid Fault Zone, named after the town of New Madrid, Missouri. The NMSZ consists of a series of large, ancient faults that are buried beneath thick, soft sediments.
Buy New Madrid Seismic Zone: Overview of Earthquake Hazard and Magnitude Assessment Based on Fragility of Historic Structures by U.S. Dept of Housing and Urban Developme, NAHB Research Center Inc. (ISBN: 9781288919901) from Amazon's Book Store.
Detailed Description This map shows earthquakes (circles) of the New Madrid and Wabash Valley seismic zones (orange patches). mile area.
The earthquakes of 1811-12 were estimated to be between a M7.0-8.0 and occurred in an area that was sparsely populated. Because of a lack of measurable strain at the surface in some areas of the seismic zone over the past 14 years, arguments have been advanced that there is no buildup of stress at depth within the New Madrid seismic zone and that the zone may no longer pose a significant hazard.
Executive Summary The New Madrid Seismic Zone (NMSZ) is potentially one of the geographically largest and most hazardous earthquake zones within the United States. Lying in the central area of the North American Plate, the seismic zone is about 45 miles (70 km) wide and about 125 miles (200 km) long. Almost all earthquakes epicenters are confined by the Reelfoot Rift’s borders. Four earthquakes of around magnitude 8 occurred in this seismic area in the winter of 1811-12, and this region continues to exhibit the highest level of seismicity in the central and eastern states of the Nation. It was reported the latest quake was located about 2 miles east-northeast of Ridgely, Tennessee, and 33 miles east of Kennett, Missouri, at a depth of 3.5 miles. Photograph of sand dike and sill exposed in drainage ditch in southeastern Missouri.
The seismic zone takes its name from the town of New Madrid, Missouri, which was destroyed in the first of those quakes.
Paleoseismic studies concluded that the New Madrid seismic zone generated magnitude 7 to 8 earthquakes about every 500 years during the past 1,200 years.
Changements topographiques [ modifier | modifier le code ] Plus de 200 ans après les tremblements de terre de 1811 et 1812, le cours du Mississippi tel qu'il était avant ces évènements est encore visible dans le …
Everyday low … And there is worse news yet, the fault line offers up extremely shallow earthquakes.
The New Madrid Region The New Madrid Seismic Zone is approximately 40 miles wide and 200 miles long.
Sand dike … 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.
From Cairo, Illinois down through New Madrid, Missouri and then on into Arkansas. The Reelfoot Rift boundary line that runs over the NMSZ.