Abstract
SUMMARY Induction arrows are a traditional output of magnetovariational experiments, and represent transfer functions used quantitatively in the inversion of geomagnetic depth sounding data to give Earth electrical conductivity structure. In this paper, a technique is tested in which ‘total-¢eld’ variations are combined with horizontal-¢eld data recorded simultaneously at remote stations in order to derive induction arrows. The method is ¢rst demonstrated using total-¢eld data recorded on land by an aeromagnetic base station, and then applied to data obtained from magnetometers £oated oishore on the sea surface. The £oating magnetometers were deployed in two con¢gurations: one tethered to the sea£oor; the second free-£oating.
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