Consider the below statements in regard to different seismic waves 1 Earthquake are the zone of seis...........

Geography Shape and Motions of Earth

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Consider the below statements in regard to different seismic waves:

1. Earthquake are the zone of seismicity where surface waves are the most destructive.

2. P and S waves both forms shadow zones and shadow zone of P waves is larger than that of S wave.

3. Shadow zones forms due to varying refractive indexes of different layers of earth.

Which of the statements given above are correct?

1&2 only

1&3 only

2&3 only

All of the above

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Explanation:

P and S waves both forms shadow zones, however, shadow zone of S wave is larger than that of P wave. Hence, statement (2) is wrong.P-waves move faster and are the first to arrive at the surface. These waves are of high frequency. They can travel in all mediums.Statement (1) and (2) are correct. Surface Waves also called as long period waves. They are low frequency, long wavelength, and transverse vibration. These waves are responsible for most the destructive force of earthquake.