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Moment magnitude scale - Wikipedia
The moment magnitude scale (MMS; denoted explicitly with M or Mw or Mwg, and generally implied with use of a single M for magnitude ) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. Mw was defined in a 1979 paper by Thomas C. Hanks and Hiroo … See more
Richter scale: the original measure of earthquake magnitude
At the beginning of the twentieth century, very little was known … See moreMoment magnitude is now the most common measure of earthquake size for medium to large earthquake magnitudes, but in practice, seismic moment (M0 ), the seismological … See more
Seismic moment is not a direct measure of energy changes during an earthquake. The relations between seismic moment and the energies involved in an earthquake depend … See more
Various ways of determining moment magnitude have been developed, and several subtypes of the Mw scale can be used to indicate the … See more
1931Kiyoo Wadati showed that the maximum amplitude of an earthquake's seismic waves diminished with distance at a certain rate.1935Charles F. Richter worked out how to adjust for epicentral distance (and some other factors) so that the logarithm of the amplitude of the seismograph trace could be used as a measure of "magnitude" that was internally consistent and corresponded roughly with estimates of an earthquake's energy.1979Thomas C. Hanks and Hiroo Kanamori defined the moment magnitude scale (MMS) as a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment.1995Choy and Boatwright defined the energy magnitude (ME) as a measure of the energy Es radiated by earthquakes.The symbol for the moment magnitude scale is Mw , with the subscript "w" meaning mechanical work accomplished. The moment … See more
Assuming the values of σ̄/μ are the same for all earthquakes, one can consider Mw as a measure of the potential energy change ΔW caused by earthquakes. Similarly, if one assumes $${\displaystyle \eta _{R}\Delta \sigma _{s}/2\mu }$$ is the same for all … See more
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Moment magnitude | Seismology, Earthquake …
WebJan 10, 2019 · Learn how the moment magnitude scale measures the size of earthquakes based on their seismic moment and fault …
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WebThe international standard for measuring earthquake magnitude is called the moment magnitude scale and was formulated by Caltech seismologist Hiroo Kanamori with alumnus Thomas Hanks. Caltech's Charles Richter …
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WebLearn how scientists measure earthquake magnitude using seismic waves and seismic moment. Compare the advantages and limitations of the moment magnitude scale and the Richter scale.
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