Geoid and topography associated with sublithospheric convection: negligible contribution from deep currents

Details Geoid and topography associated with sublithospheric convection: negligible contribution from deep currents Geoid and topography associated with sublithospheric convection: negligible contribution from deep currents

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.103..395m&link_type=abstract

Earth and Planetary Science Letters, Volume 103, Issue 1-4, p. 395-408.

Computer Science

8

Scientific paper

The sources of geoid and topography anomalies in a convecting upper mantle with realistic temperature- and pressure-dependent viscosity are studied. The results differ from those obtained in previous studies with layered, depth-dependent viscosity. For a Newtonian viscosity, the topography and the geoid anomalies coming from below the low-viscosity zone (i.e., deeper than 250 km) amount to 30 m and 10 cm, respectively, while they are reduced to 10 m and 10 cm for a non-Newtonian viscosity. It represents at most 6% of the complete signal and affects very little the geoid over topography ratio. The weakness of the contribution from the lower part of the cell is due to both small kernels and small lateral temperature variations at depth. Yet, a linear regression of the complete geoid signal versus topography yields an apparent compensation depth shallower than the base of the lithosphere. The damping of the vertical stress through a lithosphere with a depth-dependent viscosity implies a departure from isostasy and is the cause of the shallow apparent compensation depths found in our model.

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