Tomographic velocity models of the upper 1000 km of the Earth

Tomographic velocity models of the upper 1000 km of the Earth beneath the western United States. Orange regions represent low seismic velocities interpreted as warm upwelling regions that may be associated with surface volcanism. Blue regions represent high seismic velocities interpreted as cool downwellings that take the form of more planar curtains sinking into the mantle. The subducting Juan de Fuca slab has been disrupted by an upwelling plume, which appears to have torn the slab from north to south. (Image courtesy of R. Allen.)


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