The aim of this work is to create and test an automatic procedure to define an accurate subsurface velocity model by using the first arrivals in the case of seismic acquisition of a large quantity of data. We developed an integrated procedure involving conventional refraction analysis and joint tomography of the direct (diving waves) and refracted arrivals (head waves). We can thus obtain 3D velocity models which yield detailed images of subsoil structure, and allow to define reliable geologicalgeophysical models of use to mitigate landslide phenomena. We tested the procedure in an area affected by gravitational collapse located in north-eastern Italy, in the Dolomites near the city of Belluno; the application of the proposed method allowed the definition of the depth and shape of the bedrock horizon.
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