Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...76..317l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 76, Issue 3-4, p. 317-327.
Physics
1
Scientific paper
The viscoelastic deformations of a gravitational rotating multilayered Maxwell planet, submitted to a volume external potential and to internal loads, are computed using a Love number formalism. First we calculate the relaxation modes associated with the viscoelastic Love numbers; they are dependent on the jumps in density, rigidity or viscosity at each interface of the multilayered planet. The largest excitations for the relaxation modes associated with the density jump at a given interface i are obtained when mass anomalies are located at this interface. For the Moon, such a mode creates viscoelastic deformations that change the radial displacement and the mass redistribution potential at the surface, which relax with a relaxation time of about 1 Ga. Taking into account the time-scale for the Moon's age, these are quasi-constant deformations. Finally, we show that the prevailing non-hydrostatic form of the Moon can be explained by an internal load (which appeared 3 Ga ago) located between the upper and the lower parts of the lunar lithosphere, which creates viscoelastic surface deformations in the selenoid that are not completely relaxed at present.
Lefftz Marianne
Legros Hilaire
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