The newmethod needs no first break times of refraction waves,but derives adjacent receiving-point relative time shifts from crosscorrelation of adjacent-trace refraction wavegroups.

• 该法不需要拾取折射波初至时间，而是利用折射波组相邻道互相关求取各检波点的相对时差，再以中值滤波方法选取中值，作为两检波点的时差。