O-19 SUB-BASALT IMAGING USING A FULL ELASTIC WAVEFIELD INVERSION SCHEME Abstract 1 As the use of wide-aperture seismic surveying is becoming more established in areas of hydrocarbon interest the importance of mode converted waves is increasing. Although the treatment of shear waves can make an efficient contribution to the understanding of the physical properties of the subsurface a conventional acoustic approach is inadequate to handle these elastic parameters. In this paper an elastic finite difference scheme has been implemented to perform an inversion of both P-wave and S-wave velocities. Until now such inversions have been limited to near offset seismic


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