In situ measurement of electrical resistivity of marine sediments, results from Cascadia Basin off Vancouver Island

The measurements presented were performed during cruise SO-149 in the Cascadia Basin and at the eastern flank of the Juan de Fuca Ridge. The in situ probe is attached to a Lister-type heat flow instrument; therefore simultaneous measurements of thermal and electrical resistivities are possible. Strongly influenced by porosity, both data sets show good correlation. Continuous recordings of electrical resistivity can be used to validate and supplement the thermal data, which is only measured in depth intervals of 30 cm. Comparison with other independent measurements such as porosity measured on sediment cores also confirm the correct operation of the probe.