Cross section through the mantle

Cross section through the mantle

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Y. Wang and L. Wen/IRIS Consortium

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Global 3D configuration of seismic velocity heterogeneities in the mantle as imaged by seismic tomography


Cross section through the mantle showing how ray paths for diverse seismic phases from various source regions constrain the extent of the large, low-shear velocity province beneath Africa, which is bounded by the green outline. S-wave velocities within the province are about 3% lower than in the surrounding lower mantle. The structure extends upward more than 1000 km above the core-mantle boundary. (Image from Y. Wang and L. Wen, 2007. Geometry and P and S velocity structure of the “African Anomaly,” Journal of Geophysical Research, 112, B05313, doi:10.1029/2006JB004483.)

Date Taken: February 18, 2009
Photographer / Contributor: Y. Wang and L. Wen, 2007

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Seismological_Grand_Challenges, Long_Range_Science_Plan,

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