Abstract

Over 17 km of shallow, high-resolution SH-wave reflection and refraction data were collected near the Paducah Gaseous Diffusion Plant (PGDP) in Paducah, Kentucky (Fig. 1). The data have been used to characterize the shallow subsurface structure neighboring the PGDP. This study indicated that the subsurface structure influences the flow of groundwater in the study area. The study also revealed that deformation is present in the Quaternary Lower Continental deposits, which includes the regional gravel aquifer (RGA). Of interest to the characterization of the structure within the area is the presence of a graben, imaged in the Mississippian bedrock over a distance of roughly 0.8 km. The trend of this graben follows that of the Fluorspar Area Fault Complex (FAFC) and of several faults in southernmost Illinois that also display evidence of Quaternary deformation.

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