TERMIUM Plus®

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MOMENT-MAGNITUDE SCALE [1 record]

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Record 1 1989-09-29

English

Subject field(s)
  • Geology
  • Vulcanology and Seismology
CONT

The first of these shocks took place in 1980 (...). It measured 7.3 on the moment-magnitude scale (a successor to the Richter scale, designated M), (...).

OBS

[The seismic moment is] a measure of the strength of an earthquake, particularly of the low-frequency wave motion. The seismic moment is equal to the product of the force and the moment arm of the double-couple system of forces that produces ground displacements equivalent to that produced by the actual earthquake dislocation.

French

Domaine(s)
  • Géologie
  • Volcanologie et sismologie
OBS

K. AKI (1980) considère que le moment sismique est peut-être le meilleur paramètre pour mesurer la grandeur d'un tremblement de terre provoqué par un glissement de faible.

OBS

L'échelle de moment sismique est logarithmique.

Spanish

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