OxTalks will soon move to the new Halo platform and will become 'Oxford Events.' There will be a need for an OxTalks freeze. This was previously planned for Friday 14th November – a new date will be shared as soon as it is available (full details will be available on the Staff Gateway).
In the meantime, the OxTalks site will remain active and events will continue to be published.
If staff have any questions about the Oxford Events launch, please contact halo@digital.ox.ac.uk
Seismic anisotropy provides key information to map the trajectories of mantle flow and understand the evolution of our planet. While the presence of anisotropy in the uppermost mantle is well established, the existence and nature of anisotropy in the transition zone and uppermost lower mantle are still debated. Here we use three-dimensional global seismic tomography images based on a large dataset that is sensitive to this region to show the presence of anisotropy in the lower mantle beneath subduction zones. We interpret the tomography images in terms of mantle flow using results from 3-D geodynamical models and mantle fabrics calculations. We then discuss three ongoing directions to enhance the imaging and interpretation of mantle anisotropy via: (i) improved waveform modelling for independent model appraisal; (ii) more integrated seismic and geodynamical analyses; and, (iii) new data from a large-scale offshore passive experiment in the mid-Atlantic.
