21 June 2026

New seismic hazard discovery from 2011 Japan earthquake

This discovery provides scientific context for understanding earthquake mechanics and seismic wave propagation, which is relevant to GS1 geography and GS3 disaster management, though it is not a direct exam topic.

Questions

1. Explain the mechanism of ScS waves and discuss how the identification of new seismic hazards contributes to enhancing disaster management strategies in seismically active regions. 150 words
   Attempt this — 150 words in 8 min

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Prelims

1. With reference to seismic waves, what are ScS waves?

   1. A Primary waves that compress and expand the Earth's crust in the direction of wave propagation.
   2. B Secondary waves that only travel through the Earth's liquid outer core.
   3. C Waves that travel horizontally along the Earth's surface causing maximum destruction.
   4. D Waves that travel from an earthquake source to the Earth's core and reflect back to the surface.