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  2. The New Madrid Seismic Zone (NMSZ) ( / ˈmædrɪd / ), 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 .

  3. Learn about the history, geology, and seismicity of the New Madrid seismic zone, the most seismically active area east of the Rocky Mountains. See maps, images, and accounts of the 1811-1812 earthquakes that caused liquefaction, landslides, and river reversals.

  4. The simulation is based on a detailed geologic model of the central U.S. and is intended to show the general character of the long-period ground shaking expected for a large earthquake in the New Madrid seismic zone. It demonstrates the profound focusing effect the Reelfoot rift has on ground shaking produced by earthquakes.

  5. While not as well known for earthquakes as California or Alaska, the New Madrid Seismic Zone (NMSZ), located in southeastern Missouri, northeastern Arkansas, western Tennessee, western Kentucky and southern Illinois, is the most active seismic area in the United States, east of the Rocky Mountains.

  6. The New Madrid seismic zone is a source of continuing small and moderate earthquakes, which attest to the high stress in the region and indicate that the processes that produced the large earthquakes over the previous 4,500 years, are still operating.

  7. New Madrid Seismic Zone (NMSZ), region of poorly understood, deep-seated faults in Earth’s crust that zigzag southwest-northeast through Arkansas, Missouri, Tennessee, and Kentucky, U.S. Lying in the central area of the North American Plate, the seismic zone is about 45 miles (70 km) wide and about.

  8. Oct 2, 2019 · Hough believes that this large aftershock occurred around dawn in the New Madrid region near the surface projection of the Reelfoot fault. 1812, January 23, 15:15 UTC, New Madrid, Missouri 9:15 am local time, Magnitude ~7.3. The second principal shock of the 1811-1812 sequence.

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