- 253 - Near-Field Broadband Ground-Motion Simulation Using a Hybrid Approach Abuoelela A. Mohamed National Research Institute of Astronomy and Geophysics (NRIAG), Cairo, Egypt e-mail: abuoelela99@hotmail.com; amin@nriag.sci.eg Sayed SR Moustafa Geology and Geophysics Dept., Faculty of Science, King Saud University, Saudi Arabia National Research Institute of Astronomy and Geophysics, Cairo, Egypt e-mail: smoustafa@ksu.edu.sa Nassir S. Al-Arifi Geology and Geophysics Dept., Faculty of Science, King Saud University, Saudi Arabia e-mail: nalarifi@ksu.edu.sa Abd El-Aziz K. Abd El-Aal National Research Institute of Astronomy and Geophysics, Cairo, Egypt e-mail: dewaky@nriag.sci.eg ABSTRACT A hybrid empirical method is proposed to simulate broadband ground-motion that combines the stochastic method for finite faults and the k -2 slip model. The utilized approach, firstly, subdivides the fault plane into a number of subfaults. Secondly, k -2 slip model characterizing higher wave number of slip distribution is used to account for the earthquake source effect. Influences from all subfaults are then empirically attenuated to the observation sites, where they are summed using the stochastic method for finite faults to produce the synthetic acceleration time history. To validate the reliability of the proposed method to predict earthquake ground-motion in Egypt, the 1992 west Cairo earthquake, is chosen as a case study. Source parameters for the 1992 earthquake estimated by five writers are utilized to generate the k-2 slip model to account for the source effect. The bedrock acceleration time histories on Kottamya (KEG) broadband seismic station are predicted and compared with observed records at the same site. Compared synthetic with observed data showing that, despite the neglected site-effects, the complexities of measured waveforms are relatively well reproduced. Accordingly, the proposed approach can be easily applied in any future earthquake engineering and seismic hazard assessment studies. KEYWORDS: Ground-motion simulation; west Cairo earthquake; stochastic; slip distribution. I NTRODUCTI ON Predicting strong ground-motion in the vicinity of the faults is crucial in the earthquake engineering domain and seismic hazard assessment studies, that can be achieved either empirically or numerically. Most of the numerical predictions need to compute broadband ground-acceleration time series up to a few tens of Hz (Tahghighi 2011).