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A logarithmic scale used to express the 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.
[After Charles Francis Richter (1900-1985), American seismologist.]
[C20: named after Charles Richter (1900–85), US seismologist]
a logarithmic scale for expressing the magnitude of an earthquake, a measurement under 5 considered minor and over 7 indicating major destruction.
[1935–40; after Charles French. Richter (1900–85), U.S. seismologist]
A scale used to rate the strength or total energy of earthquakes. The scale has no upper limit but usually ranges from 1 to 9. Each increase in whole number represents a tenfold increase in magnitude, so that an earthquake rated as 5 is ten times as powerful as one rated as 4. An earthquake with a magnitude of 1 is detectable only by instruments (seismographs); one with a magnitude of 7 is a major earthquake. See Note at earthquake.
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|Noun||1.||Richter scale - 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|
geology - a science that deals with the history of the earth as recorded in rocks