GEOLOGY

Detailed explanation-1: -The seismic shadow zone is the rea of the Earth’s surface where seismographs cannot detect an earthquake after the waves have passed through the earth. P waves are refracted by the liquid outer core and are not detected between 104° and 140°

Detailed explanation-2: -A seismic shadow zone is an area of the Earth’s surface where seismographs cannot detect direct P waves and/or S waves from an earthquake. This is due to liquid layers or structures within the Earth’s surface.

Detailed explanation-3: -The wave properties of light are used as an analogy to help us understand seismic-wave behavior. The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves.

Detailed explanation-4: -The shadow zone of S-wave is much larger than that of the P-waves. The shadow zone of P-waves appears as a band around the earth between 105° and 145° away from the epicentre. The shadow zone of S-waves is not only larger in extent but it is also a little over 40 per cent of the earth surface.

Detailed explanation-5: -There are two different types of shadow zones relating to the two different types of body waves: S-waves and P-waves. The S-wave shadow zone covers a total of 154 degrees on the Earth’s surface, beginning at 103 degrees away from the origin of the earthquake.