Earth's inner coreThe elasticity of hcp-Fe-5wt%Si has been investigated by synchrotron X-ray diffraction up to 110 GPa and 2,100 K and by picosecond acoustics measurements at ambient temperature up to 115 GPa.
We propose a mineral physics approach based on the density functional theory to infer the viscosity of hexagonal close packed (hcp) iron at the inner core pressure () and temperature (). As plastic deformation is rate-limited by atomic diffusion under the extreme conditions of the Earth's ...
Bolt, B. A., and Qamar, A., 1970; Upper bound to the density jump at the boundary of the earth's inner core. Nature, 228: 148-150.Bolt, B.A. & Qamar, A., 1970. Upper bound to the density jump at the boundary of the Earth's inner core, Nature, 228, 148-150....
inner core/ A9110 Geodesy and gravityCriteria relevant to the determination of the distributions of density and rigidity in the inner core of a standard earth model are discussed. Tentative numerical suggestions are made. Provision is made for some flexibility to take account at a later stage of...
The geometric shape and sizes of a one-, two-and three-dimensional density structures of the Earth's inner core have been found with sufficient accuracy using approximate values of five mass moments of homogeneous bodies of simple symmetric shapes. The depth of the mass center and four shape ...
The thermal equation of state of hcp-Fe is further used to calculate the densities of iron along adiabatic geotherms to define the density deficit of the inner core, which serves as the basis for developing quantitative composition models of the Earth's inner core. We determine the density ...
, CHEN, Bin, ALP, Esen, STURHAHN, Wolfgang, and LI, Jie, (1) Department of Geology, University of Illinois at Urbana-Champaign, 247 NHB, 1301 W. Green St, Urbana, IL 61801, liligao2@illinois.edu, (2) Department of Geology, University of Illinois at Urbana-Champaign, 1301 West ...
Presents evidence of the triplet of transitional oscillations of the solid inner core of the Earth about its central position. Measurements from four long records from superconducting gravimeters; Identification of three transitional resonances;Use of spectral estimates; Model for inner and outer cores;...