Two determinations of downhole temperatures were made at Site 1178 using the WSTP temperature tool. Runs were attempted with the Adara APC temperature tool and Davis-Villinger temperature probe but were not successful because of equipment failure. The temperature data are shown in Figure F32. In situ temperatures were estimated by extrapolation of the station data to correct for the frictional heating on penetration. Both records are noisy, and only the initial part of each curve could be used for the extrapolation.
The mudline temperature and the two measurements define a linear gradient of 0.046°C/m (Fig. F33). Thermal conductivities from core samples of the upper 106 m averaged 1.1 W/(m·°C) (see "Physical Properties"), indicating a vertical conductive heat flow of 51 mW/m2.