A zone 105° to 142° from the epicenter of an earthquake in which there is no penetration of seismic waves through the Earth because of wave refraction or because the waves are not transmitted upon entering the liquid core.
An area where there is very little or no direct reception of seismic waves from a given earthquake because of refraction of the waves in Earth's core. The shadow zone for P waves is between about 105 and 142 degrees from the epicenter.
a zone at some distance from the epicenter of an earthquake which does not receive direct seismic waves due to refraction at a boundary where the seismic velocity of materials present decreases downwards across the boundary (e.g. in the Earth, the core mantle boundary at 2900 km depth causes a shadow zone from 103 to 142° away from the epicenter).
The area on the Earth's surface protected from seismic wave arrivals.
An area of the Earth's surface where seismic waves are not recorded, although it is known that an earthquake has occurred on the other side of the globe.
(Often called diffraction zone.) May be used for any region that would not be illuminated by a given source of electromagnetic (or acoustic) radiation if it propagated strictly according to ray optics in a homogeneous (on the scale of the wavelength) medium. Some radiation, however, does penetrate shadow zones because of scattering by the propagating medium or by obstacles within it. Because of the widespread misconception that diffraction is fundamentally different from scattering, the term diffraction zone is also used, especially by radio engineers, who might say that the earth diffracts radio waves into this zone (and probably would ignore scattering by the atmosphere). Yet all radiation that penetrates a shadow zone does so because of scattering by the atmosphere and by solid and liquid bodies (including the earth) within the atmosphere or at its boundary.
For other uses of the word Shadow zone see the Disambiguation page
Shadow Zone is the ninth studio album released by the Heavy Metal guitarist Axel Rudi Pell as well as the third album released by the current line-up. The album was released in 2002 by SPV.