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We performed an analysis of refraction data recorded in Italy since 1968 in the frame of the numerous deep seismic&#13; sounding and wide-angle reflection/refraction projects. The aims of this study are to construct a parametric&#13; database including the recording geometric information relative to each profile, the phase pickings and the results&#13; of some kinematic analyses performed on the data, and to define a reference 1D velocity model for the Italian&#13; territory from all the available refraction data. As concerns the first goal, for each seismic section we picked&#13; the P-wave first-arrival-times, evaluated the uncertainties of the arrival-times pickings and determined from each&#13; travel time-offset curve the 1D velocity model. The study was performed on 419 seismic sections. Picking was&#13; carried out manually by an algorithm which includes the computation of three picking functions and the picking-&#13; error estimation. For each of the travel time-offset curves a 1D velocity model has been calculated. Actually,&#13; the 1D velocity-depth functions were estimated in three different ways which assume: a constant velocitygradient&#13; model, a varying velocity-gradient model and a layered model. As regards the second objective of this&#13; work, a mean 1D velocity model for the Italian crust was defined and compared with those used for earthquake&#13; hypocentre locations and seismic tomographic studies by different institutions operating in the Italian area, to&#13; assess the significance of the model obtained. This model can be used in future works as input for a next joint&#13; tomographic inversion of active and passive seismic data

An analysis of the first-arrival times picked on the DSS and wide-angle seismic section recorded in Italy since 1968