In general, P- and S-wave velocities increase abruptly as the waves pass downward across the crust-mantle boundary.

Question

Quizplus · Accepted Answer

This is true. The abrupt increase in P- and S-wave velocities is due to the change in rock type and density between the relatively lightweight crust and the denser mantle. P-waves travel faster through solid materials than S-waves, so the velocity of P-waves increases more sharply than that of S-waves.

In General, P- and S-Wave Velocities Increase Abruptly as the Waves