Abstract
An analysis of P n-wave time residuals for the seismic stations aligned along a profile crossing Northern Apennines Ligurian Belt, Western Alps and Provence has been carried out. The waves generated by the Friuli seismic sequence have been used as input data. The data, statistically treated have shown strong variations along the profile with negative residuals (high velocity in the crust) for some Alpine stations and positive residuals in the Northern Apennines. On the basis of these data a velocity model, tested with the ray-tracing technique, is proposed. From some delayed arrivals of P n phase, very clearly observed in the Ligurian region the presence of a layer characterized by a velocity of 7.6 km/s at a depth of 25 km overlying a Moho discontinuity at 40 km has been proposed.
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