Underwater shock wave generator for seismic surveying - produces vapour bubble which collapses in contact with sea bed

摘要

The method is designed to create a shock wave inside a mass of water by implosion of a volume, that is by implosion of a vapour bubble. The volume to be imploded is formed near to the bottom of the water mass so that the bottom serves as lower limit of the volume. The energy of the implosion is thus transmitted directly and efficiently towards underlying zones. The implosion system has an implosion head, (37) of a known vapour injection type. It has also means for positioning and displacing the head at a predetermined distance for the bottom of the water mass.