A comparison of upper mantle subcontinental electrical conductivity for North America, Europe, and Asia.
Spherical harmonic analysis coefficients of the external and internal parts of the quiet-day geomagnetic field variations (Sq), separated for the N American, European, Central Asian and E Asian regions, were used to determine conductivity profiles to depths of about 600km by the Schmucker equivalent-substitute conductor method. All 3 regions showed a roughly exponential increase of conductivity with depth. Distinct discontinuities seemed to be evident near 255-300km and near 450-600km. Regional differences in the conductivity profiles were shown by the functional fittings to the data. For depths less than about 275km, the N American conductivities seemed to be significantly higher than the other regions. For depths greater than about 300km, the E Asian conductivities were largest. -Authors
Citation Information
Publication Year | 1986 |
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Title | A comparison of upper mantle subcontinental electrical conductivity for North America, Europe, and Asia. |
Authors | W.H. Campbell, E.R. Schiffmacher |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Journal of Geophysics - Zeitschrift fur Geophysik |
Index ID | 70014622 |
Record Source | USGS Publications Warehouse |