Urban resilience in the historical centres of Italian cities and towns. Strategies of preventative planning

Historical cities and towns are a valid example of resilience in a seismic context, and earthquakes have profoundly influenced their typological and constructional evolution. The improvement of this characteristic depends a great deal on the efficiency of preventative tools. Between state of the art and analytic interpretation, the development of crisis preparation strategies based on the organised knowledge of historical-constructional data and of large scale vulnerability, integrated with an urbanistic/systematic approach at the other end of the scale is proposed. The outcomes give value to two fundamental aspects: on one hand, the rapport between modifications of historical structures and relative seismic vulnerability of the aggregate of the urban fabric, on the other, the definition of priority of constructional and urban intervention.