1. Zone between \(105^\circ\) and \(145^\circ\) 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:
1 only
To solve the question regarding shadow zones in an earthquake, let's analyze each statement:
- Statement 1: Zone between \(105^\circ\) and \(145^\circ\) from epicentre was identified as the shadow zone for both P-waves and S-waves.
This statement is correct. In the context of an earthquake, the shadow zone is an area on the Earth's surface where seismic waves are not detected due to refraction within the Earth. For P-waves, the shadow zone is between approximately \(105^\circ\) and \(142^\circ\) from the epicentre. S-waves do not travel through the outer core, creating a shadow zone that is even larger. The overlap of these formations creates a combined shadow zone for both P-waves and S-waves in the specified zone. - Statement 2: The shadow zone of P-waves is much larger than that of the S-waves.
This statement is incorrect. The shadow zone for P-waves is between \(105^\circ\) and \(142^\circ\), whereas for S-waves, it extends beyond \(142^\circ\) because they do not travel through the Earth's liquid outer core at all. Consequently, S-waves have a larger shadow zone.
Therefore, the correct answer is 1 only, which correctly identifies that the specified zone is a shadow zone for both P-waves and S-waves, while statement 2 is incorrect. Thus, the answer is option
1 only
.
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