Abstract

The mLg(f) magnitude scale of Herrmann and Kijko (1983b), computed with appropriate Lg spatial attenuation functions and calibrated to mb, is proposed for routine use in northeastern North America. The Herrmann and Kijko (1983b) formula yields consistent magnitudes for different forms of Lg attenuation, and it shows little or no distance or period dependence for a data set of ten earthquakes from the northeastern U.S. and southeastern Canada. The standard deviation of the mLg(f) magnitude estimates relative to mb is about .32 magnitude units. Also, since on average mbLg=mb for the ten earthquakes in the data set, the mLg(f) formula proposed here is also calibrated to mbLg in the study region.

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