Which of the following statements with reference to shadow zones in an event of an earthquake is/are correct? 1. Zone between 105° and 145° from epicentre was identified as the shadow zone for both P-waves and S-waves 2. The shadow zone of P-waves is much larger than that of the S-waves Select the answer using the code given below:
A. 1 only
Seismographs located at any distance within 105^ from the epicentre record the arrival of both P-waves and S-waves. However, seismographs located beyond 145^ from the epicentre record the arrival of P-waves, but not S-waves. Thus, the zone between 105^ and 145^ from the epicentre is identified as the shadow zone for both types of waves. Hence, statement 1 is correct. The entire zone beyond 105^ does not receive S-waves. The shadow zone of S-waves is much larger than that of P-waves, covering over 40\% of the earth's surface. Hence, statement 2 is incorrect. Answer: 1 only
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