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在地下构造不连续的地区有可能作出良好的速度估算。这种地区的一个模型是由任意分布的点散射体组成的地壳。如果该模型上所有记录数据的偏移都共同作归位(偏移)校正,则归位校正数据就只取决于中心点和时间,但其偏移必须根据普通的平面层双曲线而定(根据这些双曲线容易估算出速度)。只须简单地颠倒通常的速度确定和归位校正的的次序就可根据点散射资料作出良好的速度估算。
It is possible to make a good speed estimate in areas where the subsurface structure is discontinuous. A model of this area is the crust of randomly distributed point scatterers. If all offsets of the recorded data on this model work together as a home (offset) correction, the home correction data depends only on the center point and time, but the offset must be based on a normal plane-layer hyperbola Based on these hyperbolic easy to estimate the speed). Simply by reversing the usual sequence of velocity determination and homing, a good velocity estimate can be made from the point scatter data.