The application of the Nuttli (1973) definition of mbLg to observations with periods away from 1.0 seconds as suggested by Boore and Atkinson (1987) and Atkinson and Boore (1987) is studied with emphasis on observations in the 1.0 –10.0 second range and on single degree of freedom seismographs. Simulation studies indicate the efficacy of this usage, but also provides insight into the interrelated effects of the instrument, anelastic attenuation and the seismic source on observed amplitudes. In order to relate a broadband Lg magnitude to the source spectrum, a correction term must be applied to the mLg (f) relation of Herrmann and Kijko (1983).

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