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  • 1
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    The pressure dependence of the elastic constants of cubic crystals in the NaCl and spinel structures from a lattice model (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Homogeneous static deformation method crystals in NaCl and spinel structures using homogeneous static deformation method
    Keywords: GEOPHYSICS
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Deep mantle viscous structure with prior estimate and satellite constraint (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A radially stratified and incompressible earth model with secular variation of the second degree gravity field J-dot(2) is used here to test sensitivity of data to viscosity increases with depth and convective boundary layer structure. Prior estimates and observed nontidal J-dot(23)(-C-dot(20)) are consistent with a layered lower mantle viscosity. Details of this layering are examined by comparing predicted and observed J-dot(3), J-dot(4). Speculation that a high-velocity layer exists above D-double prime is considered. With a 650-km thick deep high-viscosity layer, the remaining lower mantle is in one of two ranges: 1.5 to 3.5 x 10 exp 20 or 3.5 to about 10 exp 22 Pa s.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; B3; p. 4579-4609.
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    NASA TECHNICAL REPORTS
  • 3
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    Viscosity profile of the lower mantle (1985)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The viscosity of the earth's mantle is an important factor in studies of mantle convection and other problems in geodynamics. The present investigation is concerned with a determination of the variation of effective viscosity across the lower mantle from models of the Gibb's free energy of activation G(asterisk) and the adiabatic temperature profile. The variation of G(asterisk) with depth is calculated using both an elastic strain energy model, in which G(asterisk) is related to the seismic velocities, and a model which assumes G(asterisk) is proportional to the melting temperature.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal (ISSN 0016-8009); 83; 199-213
    Format: text
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    NASA TECHNICAL REPORTS
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