Figure F6. Crustal-scale hydrogeologic testing associated with Expedition 301 and related experiments. A. Map view indicating spatial relations between CORK observatories (colored circles) in Holes 1026B, 1027C, U1301A, U1301B, planned Site SR-2 and nearby basement outcrops (gold bathymetric contours). Inset shows relative locations of holes used for cross-hole experiments. Depth contours in meters. B. Calculated cross-hole responses to pumping and free-flow borehole experiments between holes at Sites SR-2 and 1026, separated by 200 m. S = storativity, T = transmissivity. C. Calculated cross-hole responses to pumping and free-flow borehole experiments between holes at Sites SR-2 and 1027, separated by 2200 m. Sites SR-2 and U1301 are 800 m apart, so the anticipated response is intermediate between the examples shown. Assumed formation properties are based on previously completed packer, free-flow, and CORK experiments. Differences in formation-scale values of T and S relative to those used would shift the curves as indicated by the arrows in B. Pumping tests in DSDP and ODP were typically only 20 min long (dotted vertical line); Expedition 301 tests were as long as 2 h. Future tests will begin with 24 h of pumping (dashed vertical line), and ultimately will last 1–2 y or more through venting of overpressured holes and pumping at the seafloor.