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The ocean sub-bottom seismometer obtained continuous temperature and tilt data in Hole 581C during a 64-day period after drilling and another temperature measurement 8 1/2 months later. These data are used to obtain a heat-flow estimate through the 110-m.y.-old crust and to determine the mechanical stability of the instrument. Temperature results show rapid temperature increase during the first week after drilling, and then a secondary trend of increasing temperature extending over several months. It does not appear possible to model these data with simple theory, and extrapolation of the temperature increase obtained during the first 6 days yields an equilibrium temperature 0.6° higher than that obtained from the total data set. We interpret these data to mean that the drilling water invaded and cooled the region around the hole. The tilt sensors in the instrument are not sensitive enough to record tectonic tilt variations. However, even with their low sensitivity, they show that the platform had not reached equilibrium by the end of the 64-day recording period.

Temperature and Tilt Variation Measured for 64 Days in Hole 581C