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The Narmada-Son lineament is important seismotectonically as

  • A.the boundary between two present-day plates
  • B.a young thrust fault of Holocene age only
  • C.a purely topographic feature with no structural basis
  • D.an ancient crustal weakness capable of reactivation

Answer: D

Correct answer: an ancient crustal weakness capable of reactivation

The Narmada-Son lineament is a Precambrian structure deep within the Indian plate, far from any present boundary, and it is significant because such old zones of weakness are the paths along which intraplate stress is relieved. The Jabalpur earthquake of 1997 was associated with it, which is the practical demonstration.

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