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: -Shadow zones are locations on Earth’s surface where no body waves from a particular earthquake can be detected.

Detailed explanation-3: -The shadow zone is the area of the earth from angular distances of 104 to 140 degrees that, for a given earthquake, that does not receive any direct P waves. The shadow zone results from S waves (not shown in animation) being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.

Detailed explanation-4: -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-5: -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.