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Seismic imaging methods based on the concept of locally coherent event have known a strong expansion in the recent years. In addition to the fact that locally coherent events fit our intuitive understanding of seismic traces, this expansion must be put on the theoretical and numerical progresses of high frequency asymptotics in seismic imaging. Indeed geometrical optics offers a beautiful frame for the analysis of locally coherent events, which can be described by various kinematic and dynamic parameters. Among them, the travel time and the slopes of the event in the gather of traces have a direct connection with the classical ray parameters, and tomographic and migration methods can be based on. In the present paper I present the basis of these methods and review the recent progresses.