In the last years a number of International and National associations, such as United Nations Development Program (UNDP), NOAA (National Oceanic and Atmospheric Administration, U. S. ) and FEMA (Federal Emergency Management Agency, U. S. ) suggested guidelines for extreme natural events risk analysis. CRATER project started from these guidelines and from data gathered after the Tsunami of 26th December 2004. One of the main aims of the CRATER project was to create a complete tool for Tsunami risk analysis in coastal areas.