The opinion article by Jones (Seism. Res. Lett.71, 395-396, 2000) and follow-up communications in Seismological Research Letters (71, 670-672, 2000) discuss pros and cons of seismic moment vs. magnitude as scaling sizes for the earthquake source and possible related units. While the moment clearly provides a better physical quantification of the earthquake source than magnitude, it has a simple and easily fixable shortcoming that stems from the inclusion of rigidity in the definition of the moment. The basic problem is that linear elastic waves generated by a slip source have no information on material properties at...

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