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A buried empty tank in liquefied ground tends to

  • A.remain exactly where it is
  • B.be crushed by the pressure of the liquefied soil acting on all of its faces
  • C.float upwards
  • D.sink rapidly to the bottom of the liquefied layer beneath it

Answer: C

The liquefied soil behaves as a heavy fluid, so anything lighter than it rises, which is why manholes and empty tanks are found protruding after an earthquake. Anchoring such structures against uplift is part of designing for a liquefiable site.

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