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Zone I was removed from the map and merged into Zone II principally because

  • A.surveying the region had proved impossible
  • B.damaging earthquakes had occurred in areas classified as Zone I
  • C.no part of India was found to be seismically active at any depth whatever
  • D.the zone occupied too small an area to be useful

Answer: B

The 1993 Killari earthquake in Latur district struck ground the map then treated as the safest category, which made a lowest-hazard zone indefensible. The revision folded Zone I into Zone II so that a minimum level of design applies everywhere.

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