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A rock burst differs from squeezing in being

  • A.confined to weak clayey material only
  • B.caused by water pressure rather than by stress
  • C.sudden and violent rather than slow
  • D.slow and gradual rather than sudden

Answer: C

Correct answer: sudden and violent rather than slow

Both are stress problems but they differ in the manner of failure. Squeezing is a slow plastic inward movement of weak rock, developing over hours or days and giving warning through convergence measurements. A rock burst is the sudden brittle failure of strong rock, throwing fragments violently with no warning, and it is far more dangerous for that reason.

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