How does depth effect seismic waves?

Depth affects seismic waves primarily through the characteristics of the materials they travel through. As seismic waves penetrate deeper into the Earth, they encounter varying densities, elastic properties, and temperatures, which can alter their speed and behavior. Generally, P-waves travel faster than S-waves, and both types of waves can be refracted or reflected at different depths due to changes in material properties. Additionally, deeper seismic waves may be less affected by surface conditions, leading to less attenuation and clearer signals.