Other
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..855d&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 5, p. 855-858
Other
6
Geodesy And Gravity, Geodesy And Gravity: Geopotential Theory And Determination, Geodesy And Gravity: Rheology Of The Lithosphere And Mantle
Scientific paper
A long history of SLR (Satellite Laser Ranging) observations of the geodetic satellites LAGEOS-I, LAGEOS-II, Starlette and Stella have been analyzed in order to estimate the time series of the low degree zonal coefficients in the Earth gravity field, up to degree six, and derive their secular drifts. The paper will point out the critical aspects of the analysis process and will compare the estimated zonal rates with other published results. Comparison of these zonal rates with the results of global, viscoelastic Earth models forced by Pleistocenic deglaciation, shows that the SLR retrieved zonals J2 and the lumped odd zonals can be used to infer the upper mantle viscosity and lithospheric thickness. Discrepancies in the viscosity profiles, required to reproduce the different zonals, seem to indicate ongoing mass redistribution over the Earth.
Bianco Giuseppe
Devoti Roberto
Donato G. Di
Luceri Vincenza
Sabadini Roberto
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