当断层的水平断距小，断层二侧地震记录的波形特征相似时，单靠相干方法已不能明显地反映断层。
When horizontal distance of faults are very small and wave shape of seismic records near the faults are very similar, coherency method can not show the faults clearly itself.
由断层作用造成的地层缩短量等于水平断距；由褶皱造成的地层缩短量等于褶皱弯曲部分的长度减去弯曲剖分的水平距离。
The shortened part due to faulting is equal to horizontal fault throw, and the shortened part due to folding is the difference between a curved formation length and its corresponding "span".
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