Figure F7. Thermal conductivity measured by needle probe on recovered cores and To plotted vs. depth at Sites 1247 and 1248. Each small symbol represents the average of three needle probe measurements corrected to in situ conditions. All in situ temperature estimates have been corrected using the empirically determined calibration constants given in Table T1, . Symbols for different instrument types are the same as in Figure F5, . Gray symbols represent measurements that were not used because they were considered to be unreliable, either because it was evident that the probe had not penetrated the seafloor (for the DVTP2 and DVTPP2, shown as squares) or because no frictional pulse was observed when the tool was extracted (APTC12 at 17 mbsf). Overlain on the data is the best-fit linear thermal gradient from the combined data set with uncertainties determined from the standard errors of the solution (Table T2, ). Also shown is the stability boundary between methane hydrate and free methane gas for pore water for the measured salinity at the bottom-simulating reflection (BSR) at this site (3.5%) and at hydrostatic pressure assuming an uncertainty of ± 5 m in water depth. The depth to the BSR and to Horizon A at Site 1247 is shown based on the vertical seismic profile reported by Tréhu et al. (this volume). The water depth and BSR depth at Site 1248 are the same as at Site 1247, assuming the velocities are the same. Horizon A at Site 1248 is coincident with the BSR.

Figure F7. Thermal conductivity measured by needle probe on recovered cores and T_o plotted vs. depth at Sites 1247 and 1248. Each small symbol represents the average of three needle probe measurements corrected to in situ conditions. All in situ temperature estimates have been corrected using the empirically determined calibration constants given in Table T1. Symbols for different instrument types are the same as in Figure F5. Gray symbols represent measurements that were not used because they were considered to be unreliable, either because it was evident that the probe had not penetrated the seafloor (for the DVTP2 and DVTPP2, shown as squares) or because no frictional pulse was observed when the tool was extracted (APTC12 at 17 mbsf). Overlain on the data is the best-fit linear thermal gradient from the combined data set with uncertainties determined from the standard errors of the solution (Table T2). Also shown is the stability boundary between methane hydrate and free methane gas for pore water for the measured salinity at the bottom-simulating reflection (BSR) at this site (3.5%) and at hydrostatic pressure assuming an uncertainty of ± 5 m in water depth. The depth to the BSR and to Horizon A at Site 1247 is shown based on the vertical seismic profile reported by Tréhu et al. (this volume). The water depth and BSR depth at Site 1248 are the same as at Site 1247, assuming the velocities are the same. Horizon A at Site 1248 is coincident with the BSR.