The upper mantle (3)

In this lecture, we continue the synthesis of seismic anisotropy observations in subduction zones, then move on to laboratory experiments on olivine deformation and its anisotropic behavior according to various factors, in particular the degree of hydration of the rock. Once again, we introduce creep laws and the contrasting microscopic sliding mechanisms in diffusion and dislocation modes, the latter being the only one to give rise to macroscopic anisotropy at a significant level.