Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A logarithmic scale used to express the total amount of energy released by an earthquake. Its values typically fall between 0 and 9, with each increase of 1 representing a 10-fold increase in energy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • proper n. a logarithmic scale used to express the energy released by an earthquake, each increase of 1 representing a 32-fold increase in energy.
  • n. A value on the Richter scale

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a logarithmic scale of 1 to 10 formerly used to express the magnitude of an earthquake on the basis of the size of seismograph oscillations

Etymologies

After Charles Francis Richter (1900-1985), American seismologist.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From American seismologist Charles Richter. (Wiktionary)

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