Tectonics of the lower mantle

Abstract

Understanding the nature of the Earth's core-mantle boundary region has implications for a wide range of Earth processes. Here I discuss seismic properties of this region, using new imaging techniques developed by myself and colleagues. Our interpretations are guided by linked geodynamical modelling, and cumulatively suggest that many of the seismic properties - heterogeneity and anisotropy - of the lowermost mantle can be explained by subduction processes that extend to the base of the mantle.