How does shadow zone emerge?

1.	How does shadow zone emerge?
Answer» Where earthquake waves are not reported, such zones are called earthquake shadow zones.It is observed that seismographs located beyond 103° from the epicenter do not record the earthquakes.Seismographs located beyond 142° again record ‘p’ waves only.The entire zone beyond 142° do not receive ‘s’ wavesThe shadow zone of ‘s’ waves is much larger than the ‘p’ waves it is equal to 40% of the earth surface

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