Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..361s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, June 1985, p. 361-364.
Physics
38
Burger Equation, Earth Mantle, Rheology, Secular Variations, Viscosity, Geoids, Planetary Boundary Layer, Sea Level, Seismology, Steady State Creep
Scientific paper
The role played by transient rheology in the interpretation of mantle viscosity is reexamined. The investigation has been carried out by comparing the amplitude responses with the data of secular variation of J(2), the relative sea-level histories at sites well within the ice margins and at the ice margin like the city of Boston. A linear Burgers body rheology has been assumed in ther lower mantle. The data near the edge of the ice load proves most sensitive to the transient viscosity structure. The non-monotonic behavior of sea-level data near Boston can be explained both by a steady-state lower mantle viscosity of 10 to the 22nd P with a thick lithosphere and by a transient lower mantle rheology but with a thin lithosphere. The long-term viscosity of the lower mantle in this second model has a steady-state value of around 5 x 10 to the 23rd P.
Gasperini Paolo
Sabadini Roberto
Yuen Dave A.
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