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This map shows earthquakes (circles) of the New Madrid and Wabash Valley seismic zones (orange patches). Red circles indicate earthquakes that occurred from 1974 to 2002 with magnitudes larger than 2.5 located using modern instruments (University of Memphis).
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.
The trends indicate a four-segment, zig-zag fault system with a total length of about 125 miles stretching from east central Arkansas northeastward through Missouri, Tennessee, Kentucky and into southern Illinois. Location of earthquake epicenters in and near the New Madrid Seismic Zone (circles scaled according to magnitude.) Probability
Expected shaking intensity of a magnitude 7.5 earthquake on the New Madrid central fault. Greens to yellows indicate moderate to strong shaking; oranges to reds indicate severe to extreme shaking and moderate to heavy damage.
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.
(a) Location map of the New Madrid seismic zone (NMSZ), illustrating major faults and approximate earthquake epicenters of the 1811–1812 earthquake sequence. Inset shows location in central...
New Madrid (Missouri) Earthquake Bicentennial. This map helps you explore aspects of some of the most powerful earthquake events to occur in the US during the winter of 1811-1812 as well as more recent seismic data. The map also includes current demographic data to highlight risk.
