3D Traveltime and Migration Weight Computation Using Wavefront Oriented Ray Tracing

P008 3DTRAVELTIME ANDMIGRATION WEIGHT COMPUTATION USING WAVEFRONT ORIENTED RAY TRACING SUMMARY R. COMAN andD.GAJEWSKI Instituteof Geophysics Universityof Hamburg Bundesstr. 55 20146Hamburg Germany We present a wavefront oriented ray-tracing (WRT) technique for computing traveltimes and migration weights in a smooth 3D velocity model. In this method we propagate a wavefront stepwise through the model and interpolate output quantities (ray quantities e.g. traveltimes slownesses) from rays to gridpoints. Our technique is based only on kinematic ray tracing which is sufficient for the computation of migration weights using finite differences. The computational efficiency is increased by (1) using only kinematic ray tracing (2)