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The Andaman and Nicobar islands owe their seismicity to

  • A.reactivation of ancient rift faults
  • B.the cooling of young volcanic rock
  • C.subduction of oceanic lithosphere beneath the arc
  • D.continental collision, exactly as in the Himalaya

Answer: C

Correct answer: subduction of oceanic lithosphere beneath the arc

The Andaman and Nicobar islands sit on the Sunda arc, where the Indian plate is subducting eastward beneath the Burma plate. That is a plate boundary setting, quite unlike the intraplate seismicity of peninsular India, and it produced the great Sumatra-Andaman earthquake and tsunami of 2004.

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