Bedrock detection from an integrated procedure of refraction analysis and tomographic inversion of the first arrivals

The aim of this work was to create an automatic procedure to define the near surface structures in the case of seismic acquisition of large quantity of data. The study area is located in North-Eastern Italy, in the Dolomites near the city of Belluno; in particular the target of this study was the definition of the depth and shape of the bedrock horizon. The seismic data used for this analysis are part of a seismic survey acquired in the surface area of Costalta comprising a dozen of 2D lines, sub-parallel to each other in the SW-NE direction, within a rectangular area of 800x600 m (Figure 1). The sources used were the miniVib and the mini-gun. We developed an integrated procedure involving the conventional refraction analysis and joint tomography of the direct (diving) and refracted arrivals (head waves).