Cross section through the mantle

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.)


No comments yet.



Welcome to the IRIS Image Gallery – a diverse collection of photographs and visuals that encompass the range and breadth of seismology and the seismological community.

Please browse through our albums. These low and medium-resolution images can be freely used for personal and educational/academic purposes, but we request you recognize the image contributor by including in your product or presentation the credit displayed with each image.

More information is available in the Image Use Agreement.

If you have any comments, questions, or suggestions related to the IRIS Image Gallery, you can send them to

Photo info

Popular tags