الفهرس 
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Abstract
This study includes the earthquake risk assessment of dense populated regions as Cairo city.The revised catalog is used to define the seismic sources using published seismotectonic models. Horizontal ground accelerations are calculated using the ground-motion prediction relationships. The results can be summarized as:
1- The earthquake hazard for Cairo is estimated utilizing the probabilistic approach. This led to the definition of 63%, 39%, 22%, and 10% probability of exceedance in 50 years, which correspond to return periods of 50, 100, 200 and 500 years; respectively for the spectral accelerations at the periods of PGA; 0.1, 0.2, 0.3, 0.5, 0.8, 1.0 and 2.0 sec.
2- The subsoil conditions in Cairo have been classified throughout the entire region using the current NEHRP Site Classes by calculated Vs(30) of boreholes (from Authority educational buildings).
3- The assessment of the earthquake risk of Cairo is based on two scenarios to study the effects of these earthquakes on population and buildings using the HAZUS software
4- We have concluded to the fallowing results. In 1754 scenario, Al-Sahel, Gharb, and Madinat Nasr Sharq districts are highly vulnerable; Manshiyat Naser, El-Waily, and Wassat (center) are low in scenario. In 1992 scenario, Al-Sahel and Gharb, districts are highly vulnerable; Manshiyat Naser, El-Waily, Manshiyat Naser, El-Waily, El- Matariya and Wassat (center) are low in scenario.