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Wabash Valley Seismic Zone : ウィキペディア英語版 | Wabash Valley Seismic Zone
The Wabash Valley Seismic Zone (also known as the Wabash Valley Fault System or Zone) is a tectonic region located in the Midwest of the United States, centered on the valley of the Lower Wabash River, along the state line between southeastern Illinois and southwestern Indiana. ==Geology== 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 still 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 perhaps two separate times in the distant past. Present-day GPS measurements show that the region deforms at about 1-2 mm/yr with compression along the Wabash Valley Fault Zone, and extension in SW Indiana (et al., 2002; Galgana and Hamburger, 2010 ).〔 〕 The crust in the area has been weakened by the numerous faults, which remain active sites for continuing seismic activity as the motion of the North American Plate exerts both compressional and tensional forces.
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