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The Richter local magnitude was originally defined using records from a

  • A.Wood-Anderson torsion seismometer
  • B.modern digital broadband sensor
  • C.strong motion accelerograph
  • D.vertical component geophone array

Answer: A

The scale was tied to the maximum trace amplitude on that specific instrument at a specified distance, which is why the definition is bound up with the equipment of its day. Modern practice computes equivalent values from other instruments.

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