Hager, Bradford H. and Clayton, Robert W. and Richards, Mark A. and Comer, Robert P. and Dziewonski, Adam M. (1985) Lower mantle heterogeneity, dynamic topography and the geoid. Nature, 313 (6003). pp. 541-546. ISSN 0028-0836 http://resolver.caltech.edu/CaltechAUTHORS:20121018-093742377
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Density contrasts in the lower mantle, inferred using seismic tomography, drive viscous flow; this results in kilometres of dynamically maintained topography at the core-mantle boundary and at the Earth's surface. The total gravity field due to interior density contrasts and dynamic boundary topography predicts the longest-wavelength components of the geoid remarkably well. Neglecting dynamic surface deformation leads to geoid anomalies of opposite sign to those observed.
|Additional Information:||© 1985 Nature Publishing Group. Received 2 July; accepted 29 October 1984. We thank D. L. Anderson, C. Chase, R. J. O'Connell and D. J. Stevenson for helpful comments. This work was supported by NASA grants NAG5-315, NSG-7610, NAS5-27226, NSF grant EAR-8317623, by the Alfred P. Sloan Foundation (B.H.H.), and by a Bantrell Postdoctoral Fellowship (R.P.C.). Contribution no. 4065, Division of Geological and Planetary Sciences, California Institute of Technology.|
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|Official Citation:||Hager, B. H., R. W. Clayton, et al. (1985). "Lower mantle heterogeneity, dynamic topography and the geoid." Nature 313(6003): 541-545.|
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|Deposited On:||18 Oct 2012 18:37|
|Last Modified:||18 Oct 2012 18:37|
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