In the framework of the Project "MAR VASTO" (Risk Management in Valparaíso, managed by ENEA with participation of Italian/Chilean partners, and support of local Institutions) multi-hazard maps for the whole area ofValparaiso (Chile) have been developed and stored in a Geographic Information System (GIS) platform. The GIS database lies upon a detailed DEM (Digital Elevation Model), built at ENEA elaborating satellite and aerial photos, and reorganizes the cartography provided by theValparaiso Municipality. Because the latter has been found often not accurate, a field survey using DGPS (Differential Global Positioning System) has been carried out, to verify the GIS archive from the topographic point of view. The GIS database also received the data regarding architectonic/urban planning and structural vulnerability studies on a pilot building stock located in the Cerro Cordillera, a city district partially located in the UNESCO zone. The GIS platform organized in a clear and user-friendly system a huge amount of data, crossing information of general interest with hazard maps and the building inventory for the target sector. © 2010 Taylor & Francis Group, London.