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The Wabash Valley seismic zone consists largely of vertically oriented ("normal") faults deeply buried under layers of sediment. Although the tectonics of the region are not fully understood and are the subject of ongoing research, these faults are thought by some to be associated with a branch of the New Madrid aulacogen, an old rift zone where the lithosphere actively began to pull apart at ...
Earthquakes in the New Madrid and Wabash Valley seismic zones from 1974 to 2002, with magnitudes larger than 2.5. The zone had four of the largest earthquakes in recorded North American history, with moment magnitudes estimated to be as large as 7 or greater, all occurring within a 3-month period between December 1811 and February 1812. Many of ...
A future earthquake in the region is extremely likely; in 2005, seismologists and geologists estimated a 90% chance of a magnitude 6–7 tremor before 2055, likely originating in the Wabash Valley seismic zone on the Illinois–Indiana border or the New Madrid fault zone.
Southern Illinois sits upon the verging point of two major fault systems, the New Madrid seismic zone and the Wabash Valley seismic zone. In the 1970s after the 5.4 Richter magnitude scale 1968 Illinois earthquake , scientists realized that there was an unknown fault under Saline County, just north of Eldorado, Illinois .
Frederik J. Simons, a professor of geosciences at Princeton University, told NBC News that the earthquake occurred on a shallow fault system in New Jersey and shook for about 35 seconds.
To map the subduction zone, researchers at sea performed active source seismic imaging, a technique that sends sound to the ocean floor and then processes the echoes that return. The method is ...
Situated in a stable continental region of the Midwestern United States, the Wabash Valley seismic zone (WVSZ) is an area of dispersed seismic activity that encompasses the border areas of Illinois, Indiana, and Kentucky.
The New Madrid seismic zone and the Wabash Valley seismic zone intersect the southern portion of the basin. The major structural features within the basin include the La Salle anticlinal belt, the DuQuoin monocline , the Cottage Grove fault system , and the Fairfield Basin .