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The 1985 Mexico City damage pattern is the classic illustration of

  • A.soft soil amplification at a particular period
  • B.surface rupture passing beneath buildings
  • C.liquefaction of a saturated sand deposit
  • D.damage caused entirely by aftershocks

Answer: A

The old lake bed amplified motion strongly near two seconds, and buildings of about that natural period were destroyed while shorter and taller ones survived. The source was hundreds of kilometres away, which makes the site effect unmistakable.

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