(1) Dear colleagues, good afternoon. First please get a cup of coffee, because this talk may be very boring to some of you. (2) In this half-hour, let me introduce some recent work, briefly, on migration velocity analysis. (3)This work is a continuing effort of Liuís 2-D analytical migration velocity analysis, and forms the main part of my Ph. D. research work. We have continued to call such a technique AMVA as named firstly by Liuís Ph. D work in 1995. I will not be able to go into great details.
(4) Following Liuís AMVA work, we extend the research from 2D to 3D, and we deal with more complicated models thus including fewer assumptions about the background models.