Consider the following statements regarding earthquake waves: I. P-waves are similar to sound waves. II. S-waves can travel through gaseous, liquid and solid materials. III. The zone between 105° and 145° from the epicentre is identified as the shadow zone for both P- and S-waves. Which of the statements given above are correct?
I and III only
Statement I is correct: P-waves are compressional (longitudinal) waves, similar in nature to sound waves. Statement II is incorrect: S-waves are shear (transverse) waves and can travel only through solids, not through liquids or gases. Statement III is correct: the region between 105° and 145° from the epicentre receives no direct P- or S-waves and is identified as the shadow zone common to both wave types. Hence, only I and III are correct.
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