52 Seismic Imaging Figure 2.12 Seismic section processed with static corrections computed by the Chronos method (Coppens, 1985). 2.5 Second example of a seismic refraction application: Hydrogeology The University of Poitiers (France) has a Hydrogeological Experimental Site (HES) built near the campus for the sole purpose of providing facilities to develop longterm monitoring and experiments for a better understanding of fluid flow and transfers in fractured rocks (Bernard et al., 2006; Kaczmaryk and Delay 2007; Bourbiaux et al., 2007). The aquifer concerned, 20 to 130 m in depth, consists of tight karstic carbonates of Middle Jurassic age, and lies on the borderline, named the “Poitou threshold”, between the Paris and the Aquitaine sedimentary basins (Figure 2.13-a), covering an area of 12 hectares. The top of the reservoir was initially flat and horizontal, 150 million years ago, but has been eroded and weathered since,
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