| 20090114473 | SHEAR WAVE GENERATOR - A shear wave generator for use subsea, including an excitation unit that is fastened to a top plate; a skirt, the upper end of which is fastened sealingly to the top plate and extending downward to an open lower end of the skirt, such that the top plate and skirt form a closed space by lowering to the seabed; and a pump arranged with fluid communication between the space and the surroundings, such that by pumping water out of the space, an underpressure is formed acting to suck the shear wave generator fixedly to and partly into the seabed, and by pumping water into the space, an overpressure is formed acting to lift the shear wave generator up from the seabed. The shear wave generator is distinguished in that the skirt is formed with a larger outer diameter or width at its upper end than at its lower end. | 05-07-2009 |
