Seismic land-marine acquisition survey on the Great Ancona Landslide

The paper deals with a reflection seismic acquisition survey carried out on the Great Ancona Landslide, a huge landslide body on the Italian Adriatic coast involving part of the city of Ancona. To investigate the area we carried out a joint land-marine seismic acquisition that gave us a continuous image of the subsurface in the land-sea transition zone where the landslide foot is supposed to be located. A specifically designed interface unit connected the analog ocean-bottom cable (OBC) lying along the sea-floor to the telemetry system used on land. The effectiveness of different source types for both marine and land shooting was tested in the field, by computing and analysing the frequency-time (FT) response of the recorded seismograms. The various sub-datasets obtained (land-land, land-marine, marine-land and marine-marine) were kept separate because of the different signal properties and the kinds of noise present; a short description of such noise is given. Finally, the acquisition statistics are discussed, and a preliminary image of the subsurface in time has been achieved from the marine-marine data.