Long-wavelength variations in Earth’s geoid: physical models and dynamical implications
1989; Royal Society; Volume: 328; Issue: 1599 Linguagem: Inglês
10.1098/rsta.1989.0038
ISSN2054-0272
AutoresBradford H. Hager, Mark A. Richards,
Tópico(s)Geological and Geochemical Analysis
ResumoRestricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article Hager B. H. and Richards M. A. 1989Long-wavelength variations in Earth's geoid: physical models and dynamical implicationsPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences328309–327http://doi.org/10.1098/rsta.1989.0038SectionRestricted accessArticleLong-wavelength variations in Earth's geoid: physical models and dynamical implications B. H. Hager Google Scholar Find this author on PubMed Search for more papers by this author and M. A. Richards Google Scholar Find this author on PubMed Search for more papers by this author B. H. Hager Google Scholar Find this author on PubMed and M. A. Richards Google Scholar Find this author on PubMed Published:04 July 1989https://doi.org/10.1098/rsta.1989.0038AbstractThe seismic velocity anomalies resolved by seismic tomography are associated with variations in density that lead to convective flow and to dynamically maintained topography at the Earth's surface, the core-mantle boundary (CMB), and any interior chemical boundaries that might exist. The dynamic topography resulting from a given density field is very sensitive to viscosity structure and to chemical stratification. The mass anomalies resulting from dynamic topography have a major effect on the geoid, which places strong constraints on mantle structure. Almost 90% of the observed geoid can be explained by density anomalies inferred from tomography and a model of subducted slabs, along with the resulting dynamic topography predicted for an Earth model with a low-viscosity asthenosphere (ca. 1020 Pa s) overlying a moderate viscosity (ca. 1022.5 Pa s) lower mantle. This viscosity stratification would lead to rapid mixing in the asthenosphere, with little mixing in the lower mantle. Chemically stratified models can also explain the geoid, but they predict hundreds of kilometres of dynamic topography at the 670 km discontinuity, a prediction currently unsupported by observation. A low-viscosity or chemically distinct D" layer tends to decouple CMB topography from convective circulation in the overlying mantle. Dynamic topography at the surface should result in long-term changes in eustatic sea level.FootnotesThis text was harvested from a scanned image of the original document using optical character recognition (OCR) software. As such, it may contain errors. Please contact the Royal Society if you find an error you would like to see corrected. Mathematical notations produced through Infty OCR. 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