Investigation of Seismic Hazard in Nile Delta Area

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To conduct seismic hazard analyses in Nail delta area we need the information of ground structure and amplification effect of seismic motion in the area. However earthquake observations and detail ground explorations have not been conducted in Nail delta. The information to be used for determining fault rupture parameters of a future earthquake has not also been corrected although the seismic activities and crust structure and its movement as well as gravity anomaly in the area surrounding Cairo city has surveyed form the beginning of 1950The purpose of this study is to collect data of historical and recent seismic activities surrounding Cairo city for estimating fault mechanisms of earthquakes which caused sever damage to infrastructures in Cairo city. Based on these data we proposed future earthquake scenarios for simulating proper seismic design earthquake motions. The soil exploration data were also collected.Using collected data earthquake motions of a future event are synthesized by superposing stochastic small earthquake motion. To developed a method for synthesize stochastic small earthquake motions using the AR-MA process we collected observed small earthquake motions at several places in Cairo city. The effect of strike, dip angle of the fault and a starting point of rupture on an attenuation of peak acceleration was investigated. The attenuation characteristic of peak accelerations obtained from simulated earthquake motions were studied in order to investigate the relation between peak accelerations and positions of the fault to the observation points. The peak acceleration at the region near the fault was much influenced by the difference of the starting point of rupture as well as the magnitude and the epicenter distance.