Translations:Rays/5/en

For example, a person in the shadow of a house is protected from the direct beams of the sun. However, that person is not completely protected from the noise of traffic on the other side of the house because sound waves with their larger wavelengths can diffract around the house. In other words, the house does not cast a distinct shadow for sound. Seismic energy does not travel exclusively along raypaths because some energy would reach points by diffraction even if the raypath were blocked. In other words, a buried obstacle does not cast a distinct shadow for seismic waves.