sloweraveragefaster
Open the cutaway to see the slice as the floor of the wedge, or lower Surface imagery to see the whole slice through the planet.
Measured data: shear-wave speed at this depth compared with the global average, from the TX2011 model (Grand, 2002). Red is slower, often hotter rock; blue is faster, often colder sinking slabs. Resolution is about 2 degrees and smoothed.