The dip direction and dip Angle of a subsurface interface must be first determined in three-parameter velocity analysis that needs predetermined dip Angle.
采用预求倾角法进行三参量速度分析时，首先要确定地下界面的倾向和倾角。
Wave equation time migration fails to image subsurface geological structure correctly in the case of obvious lateral seismic velocity variation.
当介质的速度在横向上存在较大的变化时，波动方程时间偏移不能使地下的构造正确成像。
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