Civil Services Prep

Prelims MCQ · Geography

Consider the following statements regarding seismic-wave shadow zones:

  1. Seismographs located within 105° of an epicentre record both P-waves and S-waves.
  2. The region between 105° and 145° from an epicentre is a shadow zone for both P-waves and S-waves.
  3. Beyond 145° from an epicentre, P-waves may be recorded but S-waves are not recorded.
  4. The S-wave shadow zone is confined to the band between 105° and 145°.

Which of the statements given above are correct?

  1. 1 and 4 only
  2. 2 and 3 only
  3. 1, 3 and 4 only
  4. 1, 2 and 3 only
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