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  • 1
    Publication Date: 1983-12-01
    Description: The basic conclusion is that the Nuttli (1973) definition of the m (sub bLg) magnitude is applicable to a wider range os seismic instruments than the short period WWSSN seismograph if the log (sub 10) (A/T) term is replaced by log (sub 10) A. For consistency and precision, the notation m (sub bLg) should be applied only to magnitudes based upon 1.0 Hz observations. The m (sub bLg) magnitude definition was constrained to be consistent with teleseismic P-wave m (sub b) estimates from four Central United States earthquakes. In general, for measurements made at a frequency f, the notation m (sub Lg) (f) should be used, where m (sub Lg) (f) = 2.94 + 0.833 log (sub 10) (r/10) + 0.432gamma r + log (sub 10) A, and r is the epicentral distance in kilometers, gamma is the coefficient of anelastic attenuation, and A is the reduced ground amplitude in microns. The m (sub Lg) (f) magnitude is an optimum choice for an easily applied, standard magnitude scale for use in regional seismic studies.--Modified journal abstract.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences
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