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Discussion

The Modified Mercalli scale is based on

  • A.the focal depth determined from arrival times
  • B.observed effects and reported experience
  • C.the amplitude recorded by a seismograph
  • D.the seismic moment computed from the rupture

Answer: B

Because it rests on observation rather than instruments it is inevitably more subjective than a magnitude scale, which is computed from records. Its value is that it can be applied to historical earthquakes for which no instrumental data exist.

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