P- and S-wave shadow zones begin at locations that are 98 degrees around the globe in all directions from an epicenter which corresponds to a depth near the boundary between

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P- and S-wave shadow zones are related to the properties of seismic waves as they travel through the Earth. The shadow zones begin at locations that are approximately 98 degrees from the epicenter, indicating a significant change in the material properties of the Earth's interior. This change occurs at the boundary between the mantle and the core, where the composition and state of matter significantly differ, affecting the transmission of seismic waves. S-waves, being shear waves, cannot travel through the liquid outer core, creating a shadow zone for these waves. P-waves, on the other hand, are refracted by the outer core, leading to a P-wave shadow zone.

P- and S-Wave Shadow Zones Begin at Locations That Are