Physics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997geoji.130...47d&link_type=abstract
Geophysical Journal International, Vol. 130, No. 1, p. 47 - 56
Physics
9
Earth: Models, Earth: Flattening
Scientific paper
The dynamical flattening of the Earth, as observed by geodetic techniques, is different by about 1 per cent from the value associated with the PREM density profile with hydrostatic equilibrium. The author computes a new dynamical flattening H induced by PREM mean density with hydrostatic equilibrium, to which he adds lateral heterogeneities associated with (1) seismic velocity variations observed by tomography and (2) internal boundary topographies. First, the author computes mantle circulation associated with the density anomalies derived from a tomography model. The flow-induced boundary deformations are then converted into additional mass anomalies which are added to the tomography model for computing the associated perturbation to the Earth's inertia tensor. Finally, the author shows that it is possible to obtain a dynamical flattening from the total inertia tensor (i.e. the sum of the PREM inertia tensor and of the perturbation) in agreement with that observed.
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