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Subducted slabs and the geoid: constraints on mantle rheology and flow
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hager, B. H. |
| Copyright Year | 1983 |
| Description | The total geoid anomaly which is the result of a given density contrast in a convecting viscous earth is affected by the mass anomalies associated with the flow induced deformation of the upper surface and internal compositional boundaries, as well as by the density contrast itself is discussed. If the internal density contrasts can be estimated, the depth and variation of viscosity with depth of the convecting system can be constrained. The observed long wavelength geoid is highly correlated with that predicted by a density model for seismically active subducted slabs. The amplitude of the correlation is explained if the density contrasts associated with subduction extend into the lower mantle or if subducted slabs exceeding 350 km in thickness are piled up over horizontal distances of thousands of km at the base of the upper mantle. Mantle wide convection in a mantle that has a viscosity increasing with depth provides the explanation of the long-wavelength geoid anomalies over subduction zones. |
| File Size | 3749358 |
| Page Count | 50 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19830014603 |
| Archival Resource Key | ark:/13960/t5v748d11 |
| Language | English |
| Publisher Date | 1983-04-15 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Rheology Earth Mantle Flow Measurement Mass Distribution Geoids Subduction Geology Structural Properties Geology Symmetrical Bodies Mathematical Models Planetary Mantles Boundary Layers Anomalies Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
