f Combined traveltime inversion of shallow seismic data: data acquisition and inversion

Near offset traces are usually not recorded during normal seismic data acquisition. If the near offsets are nevertheless recorded, shallow reflection can not be identified due to a combination of groundroll and shot generated noise. This shallow window can provide useful information about the velocity distribution in the near-surface necessary for further processing. In this paper a method for data acquisition and processing of shallow seismic data to obtain macro velocity models to a depth of approximately 500m is described.