The most common catalog magnitude for eastern North America is the Nuttli magnitude (Nuttli, 1973), referred to as MN or MbLg. The Nuttli magnitude is based on the amplitude of the Lg phase (multiply reflected and refracted shear waves). MN is quickly and easily determined from the time series, making it convenient for routine catalog purposes. The moment magnitude scale (Hanks and Kanamori, 1979) is generally preferred by seismologists for many applications, as it is more reflective of the actual size of the earthquake. Moment magnitude (M), however, is more...

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