© Christoph Sens-Schönfelder
Christoph Sens-Schönfelder von der präsentiert seine Forschung in einem Vortrag mit dem Titel Interrogating the deep Earth with scattered waves: What to we know about the texture of mantle and core?. Der Vortrag findet auf englischer Sprache statt.
Co-Host ist dieses Mal Mohammad Anas.
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The early geodynamic evolution of the Earth: new clues from new geochemical tracers
Abstract
The resolution of seismic tomography in the deep Earth is intrinsically limited by wavelength, station density and distance. Yet there are structures at smaller scales that influence the seismic wavefield. Seismic array methods allow to investigate localised structures below the tomographic resolution limit. At even smaller spatial scales of a few kilometres the texture or heterogeneity of the material causes wave scattering of high frequency waves. Analysing these scattered waves provides information about the texture that is complementary to the macroscopic structure. I will provide a short introduction to radiative transfer theory that is used to investigate the statistical properties of medium heterogeneity from the scattered wavefield. Using numerical solutions of the energy transfer equations I will show how seismic records are affected by deep Earth heterogeneity with a particular focus on the consequences of the heterogeneity in the D'' layer. I will conclude with an overview of what is known about the small scale structure in the deep Earth and explain the challenges that exist.