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Constraints on short-term mantle rheology from the J2 observation and the dispersion of the 18.6 y tidal Love numberInformation 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.
Document ID
19850056199
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sabadini, R.
(Bologna, Universita Bologna, Italy)
Yuen, D. A.
(Colorado, University Boulder, CO; Arizona State University, Tempe, AZ, United States)
Widmer, R.
(Zuerich Eidgenoessische Technische Hochschule, Zurich, Switzerland)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: Physics of the Earth and Planetary Interiors
Volume: 38
ISSN: 0031-9201
Subject Category
Geophysics
Accession Number
85A38350
Funding Number(s)
CONTRACT_GRANT: NAG5-400
CONTRACT_GRANT: NSF EAR-82-14094
Distribution Limits
Public
Copyright
Other

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