More signals
These traces show a “pP” wave – a P wave that bounces off the Earth's surface, goes back below and comes out again at a seismograph.
Note that the wave that bounces off the outer core (PcP wave) shows up with varying intensities. The outer core is not perfectly smooth, but has substantial topography.
It appears that Raspberry Shakes can be used to help determine the actual topography of the core!