Approximate and Exact Traveltimes in Layered, Anisotropic Media - Pure-Mode and Converted Waves

Summary APPROXIMATE AND EXACT TRAVELTIMES IN LAYERED ANISOTROPIC MEDIA: PURE-MODE AND CONVERTED WAVES M. VAN DER BAAN 1 J-M.KENDALL 1 and D. SMIT 2 1 School of Earth Sciences Univ. of Leeds Leeds LS2 9JT UK 2 Shell Expro 1 Altens Farm Road Nigg Aberdeen AB12 3FY UK The presence of anisotropy in uences many aspects of seismic wave propagation and has therefore implications for conventional processing schemes. To estimate the anisotropy we need both forward modelling and inversion tools. Exact forward modelling in anisotropic media is generally done by raytracing. However we present a new and fast method using