若使共中心点道集内的反射同相轴校平后能够同相叠加， 叠加速度则会出现一些低或高的异常。

In order to in-phase stack of aligned reflection events on CMP gathers, the stack velocities may have some higher or lower anomalies.

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利用CDP道集，可以直接获得共中心点叠加时间剖面或视深度剖面，由此可转换为法向深度剖面。

By using the CDP gather, common-mid-point stacked time section or apparent depth section can directly be obtained, which can be converted into normal depth section.

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