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A towed electromagnetic survey, mapping the electrical resistivity of the seafloor, was conducted over an area of the Eel shelf off Humboldt Bay, California. Continuous resistivity profiles to 20 m below the seafloor were measured along 120 km of track line, from water depths of 100 m to around 30 m. The shallow structure along the shelf is highly variable and we identify three distinct environments...
We have developed a new type of sediment penetrating in situ probe which logs electrical resistivity in marine and limnic sediments in the uppermost 3.5 m. As the instrument is fitted to a Lister-type heat-flow instrument, combined thermal and electrical conductivity measurements are possible. The probe incorporates no moving mechanical parts, is built to operate in water-depths up to 4000 m and is...
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