The procedure we developed and applied to several relevant buildings of the Trieste Province (Provincia di Trieste, 2015) shown in Figure 1, leads to the seismic veri cation of a building by: a) use of a scenario based neo- deterministic approach (NDSHA) for the calculation of the seismic input, and b) control of the numerical modeling of an existing building, using free vibration measurements of the real structure. The key point of this approach is the strict collaboration of the seismologist and the civil engineer, from the seismic input de nition to the monitoring of the response of the building in the calculation phase. The vibrometry study allows the engineer to adjust the computational model in the direction suggested by the experimental re- sult of a physical measurement.
