%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Lincot, A.
%A Merkel, S.
%A Cardin, Philippe
%T Is inner core seismic anisotropy a marker for plastic flow of cubic iron ?
%D 2015
%L PAR00013071
%G ENG
%J Geophysical Research Letters
%@ 0094-8276
%K inner core anisotropy ; cubic iron ; inner core deformation
%M ISI:000351847600007
%N 5
%P 1326-1333
%R 10.1002/2014gl062862
%U https://www.documentation.ird.fr/hor/PAR00013071
%V 42
%W Horizon (IRD)
%X This paper investigates whether observations of seismic anisotropy are compatible with a cubic structure of the inner core Fe alloy. We assume that anisotropy is the result of plastic deformation within a large-scale flow induced by preferred growth at the inner core equator. Based on elastic moduli from the literature, body-centered cubic or face-centered cubic Fe produces seismic anisotropy well below seismic observations (<0.4%). A Monte Carlo approach allows us to generalize this result to any form of elastic anisotropy in a cubic system. Within our model, inner core global anisotropy is not compatible with a cubic structure of Fe alloy. Hence, if the inner core material is indeed cubic, large-scale coherent anisotropic structures, incompatible with plastic deformation induced by large-scale flow, must be present.
%$ 066