Duration Magnitude
Duration Magnitude :
The logarithm of the duration of a local earthquake seismogram is generally proportional to earthquake magnitude calculated from direct-wave amplitudes. Its physical basis is given by the back-scattering theory of coda waves, after which the duration must be measured from the earthquake origin time. More often it is measured from the onset of P waves, requiring an additional minor, usually neglected, correction for the epicentral distance. See Chapter 3 of this Manual, Aki (1987), Lee and Stewart (1981, p. 155-157), Havskov and OttemÖller (2010)
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