No information related to the frequency contents is available due to the lack of accelerographic records in the near field. Local effects should also be considered since most of the new RC structures were built on marine sands aggregated to the north most part of the city by the action of sea currents during the last 50 years. Extreme flexibility in most of the buildings. The calculated inter story drift for the sample of six buildings is usually bigger than .004 and in some cases reaches values of .006 or .008. When the infill walls will be able to accept values of .001 to .002 only.
Buildings is formed by spatial frames, beams and columns.
Only few of them have shear walls, and in such cases, they are not long enough to carry most of the lateral loads. The infill walls are made of fragile hollow bricks, made out of pumice, with no anchorage to the frames. Very long spans between columns or resisting walls to provide wide open spaces for windows or swimming pools, in some cases 8 to 11 m. Big balconies that resulted in inadequate cantilever systems. Soft first stories.