Ray modelling has proven useful in a wide range of seismic applications, including survey planning, velocity inversion. map migration. synthetic seismogram generation, model-based stacking, and pre- and post-stack depth migration. Still, the spreading of modelling-based techniques relies very much on how easy modelling is to use. If modelling requires lots of special interpretation and preparation and very specialized skill to make useful results, the application is limited to the rare, special cases. On the other hand, if modelling in large can do with data made in standard processing and interpretation, and easy-to-use, efficient, and robust ray calculation is available, ray-based modelling applications may flourish. Simple ray-based applications, like map migration, may even become part of the standard, routine tools.


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