Earthquake Watchers Know Their P-Waves S-Waves Desk Mat

Seismologists will enjoy this educational earth scientific attitude desk mat featuring a cross section of the whole Earth and showing the complexity of paths of earthquake waves. The paths curve because the different rock types found at different depths change the speed at which the waves travel. Solid lines marked P are compressional waves; dashed lines marked S are shear waves. S waves do not travel through the core but may be converted to compressional waves (marked K) on entering the core (PKP, SKS). Waves may be reflected at the surface (PP, PPP, SS). Make others do a double-take with the earth scientific truism saying "Earthquake Watchers Know Their P-Waves & S-Waves" on this desk mat!