The electrical conductivity of the sea floor is usually much less than that of sea water, and not all electrical measurements made on the sea floor are particularly sensitive to the electrical conductivity value. The analytic impulse and step-on transient responses of two conductive, adjoining half-spaces (with a large conductivity contrast) to an in-line electric dipole-dipole electromagnetic system located on the interface are derived. The shape of the transient at relatively early time is seen to be independent of the conductivity of the more conductive half-space and is indicative of the conductivity of the less conductive half-space. Based on this observation, a simple, practical system can be designed to measure sea floor conductivity.

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