2025 · Q31
Consider the following statements with reference to Secondary waves (S-Waves) generated during an earthquake:
- 1They create troughs and crests in the material through which they pass.
- 2The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Select the answer using the code given below:
General KnowledgeGeography
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
Both statements are correct and reproduce NCERT's description. S-waves (secondary or shear waves) vibrate in a direction perpendicular to the direction of wave propagation, in the vertical plane. In doing so they create troughs and crests in the material they pass through. This perpendicular vibration is also why S-waves cannot travel through the Earth's liquid outer core.