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- W88859291 abstract "A new hypothesis is proposed for intraplate seismicity in the southeastern United States that has for its basis a hydrologic framework primarily, and a geologic framework secondarily. A correlation is shown between epicenters and rivers with high hydraulic gradients that suggests that deep diffusion of water within a groundwater basin is genetically related to seismicity. According to the model, seismicity should occur in the crust wherever relatively high river gradients are coincident with an adequate supply of groundwater. Depending on Poisson's ratio and the ambient tectonic stress, the horizontal stress in the crust is generally less than the lithostatic stress, resulting in approximately vertical joints and fractures that can extend to great depths. Groundwater enters recharge areas along steeply-dipping flowlines and diffuses along the approximately vertical joints and fractures. In discharge areas, groundwater enters rivers from below along near-vertical flowlines, and is available for possible development of clay minerals along the interconnected joints and fractures. Published observational data suggest that those joints and fractures normal to the least horizontal stress open in tension aseismically; those at an angle to the maximum horizontal stress fail in shear as seismic events along approximately vertical fractures in a direction governed by the greatestmore » horizontal stress. The four seismogenic areas in the southeastern US are within groundwater basins having the highest average river gradients. Focal mechanisms confirm failure along steeply dipping planes.« less" @default.
- W88859291 created "2016-06-24" @default.
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- W88859291 date "1985-01-01" @default.
- W88859291 modified "2023-09-24" @default.
- W88859291 title "Hydrologic model for intraplate seismicity in the southeastern United States" @default.
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