The isotherm and composition model of Forsyth and Press (1971) for a mid-ocean ridge system is combined with recent data on the electrical conductivities of basalt and olivine. The response of the resulting two-dimensional conductivity model to geomagnetic variations is calculated by using the numerical methods of Jones and Pascoe (1971) for periods of 5 min, 1 hour, and 1 day. The results show that the electrical conductivity structure beneath such a ridge can be best detected by using magnetotelluric observations on the sea floor.
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Duba et al. (1972) studied this question.
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