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- W1983470921 abstract "Electrical conductivity properties of the upper mantle for a North American sector of the Earth have been determined using the 24-, 12-, 8-, and 6-hr spectral components of the quiet-day geomagnetic field variations. Spherical harmonic coefficients obtained from an analysis of the three components of the quiet daily variation (Sq) field for the solar-quiet year of 1965 were applied to a modeling procedure that was modified from SCHMUCKER'S (1970) publication. From depths of about 140 km to about 540 km, the conductivity, σ(ohm-meter) -1, may be represented byσ=0.0067e0.0070d, where d is the depth in kilometers. Small perturbations of conductivity indicating some layering at 140 to 220, 220 to 400, and 400 to 600 km correspond to the similar behavior of the Earth's density in these regions. From temperature-depth models we infer that the multiphase bulk properties of the expected silicates in these regions behave approximately asσ=1.4×103e-1.8×104/T, where T is the temperature in degrees kelvin. The constants of this equation do not seem to be very model dependent." @default.
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- W1983470921 date "1983-01-01" @default.
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- W1983470921 title "Conductivity of the subcontinental upper mantle: an analysis using quiet-day geomagnetic records of North America." @default.
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- W1983470921 doi "https://doi.org/10.5636/jgg.35.367" @default.
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