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, stratification, thermal convection, magnetic forces. 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 standard model to compute the lattice preferred orientation generated during the geodynamical deformation process. Using the elastic constants of different solid phase of iron at the inner core conditions, 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.