Seismic and geotechnical hazard problems are widespread all over the world and they can cause natural disasters, damaging properties or causing human lives losses. Italian municipalities are not yet organised either to deal with the phenomena consequences, or to plan risk mitigation actions. A clear knowledge of the location and of the space and time evolution of the phenomena is needed for a vulnerability mitigation in the probably involved areas. Geo-hazard can be related with the consequences for exposed people and man made work by a microzonation. GIS technologies could play a crucial role in analysing large areas, but a good geodatabase should be designed and populated with all the available data. In this work, an approach to detect geotechnical hazard factors and vulnerability elements of urban areas is presented. A geodatabase is designed in terms of conceptual and logical model. A multy-risk analysis is carried out, pointing out geotechnical seismic and hydrogeological risk. Expressly created forms are proposed, that include specific sections regarding buildings, infrastructures and lifelines for vulnerability detection. Some applications in central Sicily (Italy) are shown. From such a analysis, Civil Defence and Local Authorities could obtain a continuous stream of information and integrate them into models for hazard knowledge, vulnerability mitigation and risk prevention.