Seismic anisotropy of the inner core deduced from geodynamical and mineralogical models

We generate different geodynamical models of formation of the inner core which take into account differential growth and stratification. According to the relative importance of the different processes, the time evolution and the present day inner core show a large variability. Then, we use a visco plastic standart model to compute the lattice prefered orientation generated during the geodynamical deformation process. Considering the presumed stable crystallographic phases of iron at inner core conditions, we define a chosen set of mineralogical elastic models both published and artificially generated. We compute the variation (amplitude and direction) of the P-wave velocity in the inner core. Then, we represent these results as maps/graph of travelling time anomalies which can be easily compared to real seismological data. These comparisons lead us to propose a preferred model of the growth evolution of the inner core. Also, the comparative study of the artificial elastic models allows a better understanding of the impact of the variation of specific crystallographic parameters on the resulting seismic signal and feedback on the different published Ab-Initio elastic models of iron.;