Seismological and mineralogical constraints on the inner core fabric

Details Seismological and mineralogical constraints on the inner core fabric Seismological and mineralogical constraints on the inner core fabric

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t..19g&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 20, pp. 19-1, CiteID 1958, DOI 10.1029/2002GL015268

Physics

3

Mineral Physics: Elasticity And Anelasticity, Seismology: Core And Mantle, Seismology: Body Wave Propagation, Tectonophysics: Earth'S Interior-Composition And State (1212)

Scientific paper

Under the assumption of lattice preferred orientation of iron hcp crystals, the seismic anisotropy of the inner core is related to single crystal elastic properties by a fabric model. This model is able to explain a new seismological constraint: the constant behaviour of the ratio k of two anisotropy coefficients, despite radial and lateral variations of the anisotropy level in the inner core. The relevance of the theoretical calculations of iron single crystal elastic properties at inner core conditions are tested by a comparison between seismic estimates and computed values of this ratio k. Taking into account the error bar of the seismic estimate, iron hcp structures presenting fast and slow c axis could fit the data equally well.

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