GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 2.1 GNGTS 2024 Figure 1. Relation between and fitted with a Gaussian curve of order 1 and forcing the peak to the 10 point 0,1. Grey lines are the events observed, red solid curve represents the best fit, while the standard deviation is shown by the red dashed curves. Some statistical parameters of the Gaussian: , fit , error 1 = 0. 8229 2 = 0. 7822 and standard deviation . = 0. 0597 σ = 0. 1980 CONCLUSIONS AND FUTURE PERSPECTIVES Based on equation [3], we are able to provide a preliminary spectral parametrization of the amplitude of the source directivity, adopting a simple functional form with input values of and . Based on several empirical models (see Sgobba et al., 2021b ), is function of magnitude whereas the bandwidth can be modelled as directly proportional to the “strength” of the directivity. At this stage, shaking scenarios in Central Italy can be generated including directivity contributions using non-ergodic ground motion models, once that the direction of rupture propagation and the level of source directivity is assumed a priori .