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Unformatted text preview: Van der Hilst, RD et al. 1997. Nature 386: 578-584 Svensen, H et al 2004. Nature 429: 542-545 Justin Liefer MAS 603 P-Wave Compression wave Only through solids fast-moving first arriving S-Wave Shear wave Solids and liquids slower longitudinal Surface Waves Rayleigh waves long wave, slow waves passing through different substances light and tranparent liquids refractive index with seismic waves impedence Impedence depends on wave velocity and density of substance Seismic tomography Reflection Sesimology Convective Mantle Mineral phase changes to weak for stratification Deep anomalies = slabs in lower mantle Global Tomography and gravity data explained better Stratified Mantle Some slabs stuck in upper mantle Really old reservoirs = poorly mixed Large database over 30 years Model by inversion Comparison to other on-going models P-wave data for Lower Mantle High Resolution Great deal of similarity with model based on S- waves Slab model for 1800-2000 km- Excellent recovery...
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