ShadowZones_Seismic_Vs_Light.mov

www.iris.edu/hq/programs/education_and_outreach/animations
The wave properties of light are used as an analogy to help us understand seismic-wave behavior. Most shadows aren't black; that's because light reflects off of nearby objects and the redirected and reduced light energy strikes and brightens the area in shadow. Light can also bend, for example refracting at the water surface illuminating objects below the surface, or appearing to make half-submerged objects bend. Seismic waves also reflect and refract off layers in the Earth.
For related animations, please visit:
http://www.iris.edu/hq/programs/education_and_outreach/animations

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