An interpretation is made of magnetic variations of the bay type observed in Iceland, in terms of the behavior of the Z/H ratio with distance from source. Observations from Greenland observatories are used to provide an estimate of the characteristic width of the auroral current system. It is concluded that a region of enhanced electrical conductivity must underlie Iceland. If the anomalous material has the conductivity of molten lava, its most probable depth is 30 km, and, on the basis of the available observations, it appears to underlie the entire island.
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Hermance et al. (1968) studied this question.
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