A zone between 105° and 140° from the epicentre is identified as the shadow zone for P and S waves.

Monjur Alahi

Give geographical reasons:

A zone between 105° and 140° from the epicentre is identified as the shadow zone for P and S waves.


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Salim Ahmed Kawsar

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A zone between 105° and 140° from the epicentre is identified as the shadow zone for P and S waves because-

1. Generally, seismographs located at any distance within 105° from the epicentre, record the arrival of both Pwaves and S-waves. 

2. However, the seismographs located beyond 140° from the epicentre; record the arrival of P-waves but not that of Swaves.

3. The shadow zone results from S-waves being stopped entirely by the liquid core and P-waves being bent (refracted) by the liquid core.

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