On the Scattering in Normal Distribution of the Peak Ground Acceleration Residuals in Alborz Region

Abstract eng:
The scattering of residuals has great influence on probabilistic seismic hazard assessment which is fairly upgraded from its original method by including the scatter in the integration scheme and several methodologies for desegregation. This article gives the results of the scattering study in the obtained residuals based on the recently developed attenuation relationship for Alborz region. Several statistical tests have been applied to show to what extend the scatter in residuals is truly represented by the normal distribution. As revealed by the results of the present study the lognormal distribution is valid just in the range of three standard deviations around the median value. Thus the truncation in PSHA studies must be considered in the given range. The applicability of the proposed relationship for Alborz region as well as several other relations, developed for shallow crustal environments, is also studied by means of statistical tools. The results clearly reflect the significance of using region-specific strong motions in developing attenuation relations suitable for the specific region.

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