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During the 6th September 2002 earthquake the highest damage level in Palermo was observed in the SE sector.&#13; This is a recent urbanization area where reinforced concrete structures predominate. A detailed analysis of soil&#13; properties in Palermo was carried out by City-GIS to investigate a possible role of nearsurface geology on earthquake&#13; effects. City-GIS is a tool dedicated to natural hazard evaluation in urban areas. The availability of high&#13; density of well log data (stratigraphic and geotechnical) allowed a realistic modeling of surface geology and&#13; physical-mechanical properties that control the seismic response. In wide zones of the above mentioned sector&#13; of Palermo, outcropping terrains are composed of thin calcarenite layers, lying above remarkably thick siltyclayey&#13; sands that overlay the Numidian Flysch, commonly considered the bedrock of Quaternary sediments.&#13; Since silty-clayey sands feature greater deformability properties (Young's modulus) and smaller resistance properties&#13; (undrained cohesion and shear resistance angle) than Numidian Flysch, these zones of the SE sector exhibit&#13; high values of the acoustic impedance contrast. Moreover, a quite wide portion of the study area, crossed&#13; by the Oreto River, is characterized by very thick alluvial deposits. Here, the significant lateral variations of the&#13; lithostratigraphic geometry may be an additional cause of strong site effects

Effects of the 6th September 2002 earthquake: damage amplification in the south-eastern sector of Palermo explained by GIS technology