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The solid straight line in the middle of the New Madrid seismic zone is the surface projection of the modeled fault, which ruptures in the simulation. The colors are keyed to the peak intensity of ground velocity at the surface.
Officially started in 2006, the New Madrid Seismic Zone (NMSZ) Catastrophic Planning Project, remains the largest multi-state response planning effort of its kind, and drew upon lessons learned from previous planning initiatives throughout the nation.
27 Ιουλ 2024 · Researchers have mapped out three currently active ancient fault lines—fissures in the Earth’s crust—in the New Madrid area that formed about 500 million years ago, at a time when the North...
The New Madrid Seismic Zone (NMSZ), 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.
29 Σεπ 2022 · Key Points. New Madrid Seismic Zone hypocenters for the years 2000–2019 are relocated and have a median relative location error of 65 m. Planes are fit to the relocated hypocenters producing a detailed three-dimensional model of fault structure. The Reelfoot fault is segmented by the Ridgely fault.
Photographs 5 and 6 show damage to modern structures close to the epicenter of a magnitude 6.5 earthquake, a small shock compared to the magnitudes (8.4–8.7) of the New Madrid earthquakes. Photographs 8–10 are typical of damage that can occur at large distances from great earthquakes.
The Reelfoot rift is identified today as a subsurface system of fractures and faults in the earth's crust. New Madrid seismicity is spatially associated with the Reelfoot rift and may be produced by movement on old faults in response to compressive stress related to plate motions.
