Role of density and of lateral variation of rheology on the Earth tides : a numerical approch

Details Role of density and of lateral variation of rheology on the Earth tides : a numerical approch Role of density and of lateral variation of rheology on the Earth tides : a numerical approch

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.g52a0965m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #G52A-0965

Physics

1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1234 Regional And Global Gravity Anomalies And Earth Structure, 1249 Tides: Earth, 3230 Numerical Solutions, 7207 Core And Mantle

Scientific paper

Earth strain and gravity responses to phenomenon such as tides or atmospheric loads, are generally calculated assuming earth models radially stratified, and at hydrostatic equilibrium. However, some local observations show unexplained perturbations on the tidal gravity signal. A possible cause for those perturbations is the neglect of rheology and density lateral variations. We investigated a non radially symmetrical earth numerical model with the intent to study the earth response to low frequency forcings. This model uses a finite element method (spectral element) developed on the "cubed sphere" mesh (Ronchi et al., 1996), and resolves gravito- elasticity equations. It is an extension of an elastodynamical model originally made for the calculation of synthetical sismogram (Chaljub, 2000). We needed therefore to add Poisson equation and gravity perturbation on the original one. Finally, the non hydrostaticity of the Earth is taken into consideration by a first order perturbation theory. As a first application, we investigate the possible influence of a mega- plume on gravity tide. We present here, the theoretical principle of our approch and our first results.

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