The inner core

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The inner core
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The D region
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Bounce points of ScS
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Transition zone
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The upper mantle
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Tomography
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The data

• Body waves, surface waves, free oscillations

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ScS-S residuals (secs) plotted at ScS bouncepoint
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SS-S residuals (secs) plotted at SS bouncepoint
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Final coverage of D including Pdiff, Sdiff and
ScS
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Rayleigh waves at 50 seconds
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Models
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Shear velocity -- -1 isovelocity surfaces
Includes S and SS cluster analysis data
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Large anomalies
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Still large--dont see subduction zones
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Little of cratons left
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Scale change! Subduction!
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Possible slabs
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Superplumes or plume groups
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Improves resolution of structure near the base of
the mantle
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Where do slabs go?
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Temperature or chemistry?
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Bulk Sound Speed
Correlation of shear and compressional velocity
can tell us about the physical cause of an anomaly
P velocity
S velocity
Bulk Sound Speed
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Shear velocity
Bulk sound speed
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Comparison of bulk sound speed and shear velocity
residuals in D
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Mantle layering?
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-110K
110K
2 phase transformations
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