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Maximum spectral energy for seismic magnitude estimation; Part I, Rayleigh-wave magnitude

Yacoub Nazieh, K.

Bulletin of the Seismological Society of America 88(4): 952-962

1998

A method for accurate estimation of surface-wave magnitudes is presented as an alternative to M (sub s) , the classical time-domain magnitude. The salient features of the method are the use of velocity and frequency windows to isolate seismic phases and the use of maximum spectral energy to characterize ground motion for magnitude estimation. Rayleigh-wave ground motion estimated by the new method is generally consistent, but not identical, to that measured in the time domain. The estimated ground motion is used to determine Rayleigh-wave spectral magnitudes for 27 presumed nuclear explosions, from several test sites. These magnitudes are studied for their accuracy and for their transportability between nuclear explosion test sites. For accuracy, we compare spectral magnitudes M (sub R) with their corresponding time-domain-measured magnitudes M (sub s) . The comparison encompasses network magnitudes and their standard deviations and magnitude residuals. For transportability, we studied the variations in m (sub b) (body-wave magnitude). M (sub s) (time-domain magnitude), and M (sub R) (spectral magnitude) for network-averaged m (sub b) -equivalent presumed nuclear explosions at the Shagan River and the Qingger test sites. These studies showed that this spectral magnitude has a smaller error than classical time-domain M (sub s) and that it is transportable between the two test sites.

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