الفهرس | Only 14 pages are availabe for public view |
Abstract ABSTRACT XIV ABASTRACT A milestone of any seismic hazard analysis is the selection of ground motion prediction equations (GMPEs). In order to reduce uncertainty in the seismic hazard analysis, more than one GMPE is recommended to be used in the framework of the logic tree, the candidate GMPEs must be carefully selected and adjusted to a specific region. The current study presents procedures that evaluate GMPEs for northern Egypt using ground motion dataset from 66 earthquakes of Mw 3.5-7.1 recorded by the Egyptian National Seismological Network (ENSN) and networks from neighboring countries, for periods from 0.01 to 10 s and distances of 0-300 km. The method of study is based on the comparison of 5% damped Pseudo-spectral Acceleration (PSA) of observed and predicted ones using GMPEs of Abrahamson et al. (2014), Zhao et al. (2006), and Akkar et al. (2014). Based on the comparison we did residual analysis and define correction coefficients as the mean residual values versus distance at intervals of 50 km. from this comparison, it is found that the Abrahamson et al. (2014) and Akkar et al. (2014) models generally provide a good prediction of PSA inferred from visual inspection and residual analysis. For instance, Abrahamson et al. (2014) model has the best fit to the observation at short source-to-site distances of < 50 km. At farther distances, we found that the model of Akkar et al. (2014) has the best fit to the observation. On contrary, it is noticed that a large deviation from observation is found when applying the Zhao et al. (2006) model. Furthermore, we corrected the three GMPEs using the correction coefficients derived in this study and found that the variations are significantly reduced. |