Abstract
A new process for generation of accurate velocity rays in 3D models has been developed. The velocity rays describe the changes in isochron points and slowness vectors when a model parameter is allowed to vary. The process is organized with ODE solvers on two levels, where the upper level is model independent. The lower level includes conventional one-way kinematic and dynamic tracing of source and receiver rays, as well as estimation of ray perturbation quantities. Accurate velocity rays are expected to be useful in sensitivity studies, propagation of seismic images, and velocity model updating.
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