As part of the CREEP project, at the Institut für Geophysik in Münster we use seismology to probe anisotropy and deformation in the D" region (the lowest few hundred kilometers of the Earth’s mantle, figure 1).
This region seems to have a fundamental role in the geodynamics of our planet. Global tomographic image, at those depth, show fast and slow regions which have been associated to descending of slabs and uprising of plumes, as depicted in the cartoon of figure 1. These structures are most likely associated at flow in the deep mantle and probing seismic anisotropy could help us to understand the mantle rheology and dynamics. Moreover, a phase transition from perovskite (bridgmanite) to post-perovskite is expected to be the seismic marker of the D" discontinuity. Due to the different rheological behavior of ppv respect to pv, anisotropy in ppv is a good candidate to explain the observed seismic anisotropy in the around the core mantle boundary.