地震同相轴到达时的延迟或差异，这是由于岩石的风化层和地下地质体的变化产生的。
The delay or difference in the arrival time of seismic events that can result from weathering of the rocks or variations in geologic structures in the subsurface.
对两种固定延迟线及轴头延迟进行了具体测试，总结出了一些提高测试精度的方法。
Through the practical measurements of two types of fixed delay line and a tapped delay line, some procedures for increasing measurement precisiOn are obtained.
在近轴、远距离传输情况下的离轴距离与延迟时问成简单的线性关系。
The simple linear relationship between off-axis distance and delay time was also derived in the case of paraxial and remote transmission.
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