GIS-BASED EARTHQUAKE DAMAGE ANALYSIS IN THE GREATER CAIRO AREA

摘要

In the present study, a GIS-based earthquake damage analysis system is developed to assess the structural effects of the 12 October 1992 earthquake, that hit Cairo city and its vicinity, on the buildings stock in the greater Cairo area and to review the performance of structures during the earthquake. The essential core data of the system is derived from large selection of structural evaluation reports of 2270 buildings geographically distributed in all districts of the greater Cairo area. Damage state is defined in terms of its type, severity and extent. Structural damage is classified into seismically and non-seismically related cases. The damage analysis system integrates the spatial data and the attribute data. The spatial data consist of a number of data layers that have their geographic distribution such as the administrative boundaries of greater Cairo, structural inventory, soil type classification, peak ground acceleration, intensity distribution, ground water levels, location of epicenter of the earthquake. The attribute data consist of the information obtained from the investigation reports after the earthquake. The system provides tools to edit, store, retrieve and manipulate the geographic and non-geographic data. Also the system enables to overlay various layers of data together (spatial analysis).