The oceanic lithosphere descends into Earth’s mantle as subducting slabs. Boundaries between the subducting slab and the surrounding mantle are defined as slab interfaces, whose seismic imaging is the key to understanding slab dynamics in the mantle. However, data on the existence of slab interfaces below 200 km remains elusive.
Click here for original story, Distinct slab interfaces found within mantle transition zone
Source: Phys.org