Constraints on short-term mantle rheology from the J2 observation and the dispersion of the 18.6 y tidal Love number

Details Constraints on short-term mantle rheology from the J2 observation and the dispersion of the 18.6 y tidal Love number Constraints on short-term mantle rheology from the J2 observation and the dispersion of the 18.6 y tidal Love number

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38..235s&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 38, May 1985, p. 235-249. Research supported by the Minister

Physics

15

Earth Mantle, Earth Tides, Geodynamics, Gravitational Fields, Rheology, Earthquakes, Lageos (Satellite), Oscillations, Viscosity

Scientific paper

Information derived from data recently acquired from the LAGEOS satellite is used to place some constraints on the rheological parameters of short-term mantle rheology. The validity of Lambeck and Nakiboglu's (1983) rheological model is assessed by formally developing an expression for the transformed shear modulus using a truncated retardation spectrum. This analytical formula is used to show that the parameters of the above mentioned model are not consistent at all with the amount of anelastic dispersion expected in the Chandler wobble and with the attenuation of seismic normal modes. The feasibility of a standard linear solid (SLS) rheology operating over intermediate timescales between 1 and 100 yr is investigated to determine whether the tidal dispersion at 18.6 yr can be explained by this model. An attempt is made to place some constraints on the parameters of the SLS model and the nature of short-term mantle rheology for timescales of less than 100 yr is discussed.

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