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Marine heat flow data, obtained with a Lister-type probe, consists of twotemperature decay curves, frictional and heat pulse decay. Both follow the samephysical model of a cooling cylinder. The mathematical model describing thedecays is non-linear as to the thermal sediment parameters thus a directinversion is not possible. To overcome this difficulty, the model equations areexpanded using a first-orderTaylor series. The linearised model equations areused in an iterative scheme to invert the temperature decay for undisturbedtemperature and thermal conductivity of the sediment. The inversion scheme istested first for its theoretical limitations using synthetic data. Inversion ofheat flow measurements obtained during a cruise of R/V SONNE in 1996 and needleprobe measurements in material of known thermal conductivity show that thealgorithm is robust and gives reliable results. The programme can be obtainedfrom the authors.

Inversion of marine heat flow measurements by expansion of the temperature decay function