Migration Velocity Analysis Using a Ray Method Asymptotics of the Double Square Root Equation

Seismic images of subsurface structures are the most valuable outcome of seismic dataprocessing. The image quality is strongly affected by the accuracy of background velocity model.In this paper, we develop a gradient-descent velocity update algorithm based on our originalhigh-frequency asymptotics of the Double Square Root equation, i.e., a special one-wayapproximation of the wave equation describing single-scattered wave field only. We propose a lossfunction consistent with widely adopted imaging condition and derive equations for its gradientcomputation. We test our method on noise-free synthetic datasets in 2D settings.