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Neotectonic movement in the United States east of the Rocky Mountains results from various superimposed intraplate adjustments related to movement in the North Atlantic Basin and glacial rebound. Some movements, such as slight southward tilt in the north from waning rebound and northward tilt of the entire region, appear aseismic. Others form a rectilinear grid pattern of zones of fractures and vertical movement and coincide with the distribution of seismicity. Most seismic source areas occur along northwest-trending fracture zones, which commonly have some right-lateral strike-slip displacement. They have broad, northeast-trending belts of rising highlands and sinking lowlands and are...

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