Comparative Study of Uniform Hazard Spectra Derived Using Different Ground Motion Estimation Models: A Case Study

Abstract eng:
The aim of this paper is to compare the effects of different strong-motion estimation equations on the uniform hazard spectra. Three models are used in the comparison, which are the Campbell and Bozorgnia (2007) model, the Ambraseys et al. (2005) model and the Sigbjörnsson and Ólafsson (2004) model. The reliability of ground motion estimation equations is based on the quality of the available strong-motion data. In Iceland recorded strong-motion data is limited with the most significant seismic events recorded in being the South Iceland Lowland earthquake sequences of June 2000 and May 2008. A trend that appears to be consistent for Icelandic strong-motion data is that the recorded peak ground acceleration is very high in the near-fault zone but appears to attenuate more rapidly than models commonly applied in earthquake engineering hazard studies. The hazard curves are derived by generating a synthetic earthquake catalogue, thereby calculating the strong-motion effects induced by each event applying an appropriate ground motion estimation model and then order statistics, which can be repeated to enhance the computational stability of the results. The main findings are that, even though the deviation between the ground motion estimation models applied may seem considerable, the difference in the uniform hazard is not necessarily all that much for the study site, except in the case of models based solely on Icelandic data. Furthermore, it is found that the Eurocode 8 model spectrum of type 2 can be applied with confidence for the study area.

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