With the use of reciprocal principle in seismic wave propagation, the algorithm may be used to compute the travel times of reflected compressional wave or converted shear wave.
利用地震波传播的互换原理，将算法推广到用于计算反射纵波和反射转换横波的旅行时。
This kind of shear wave is actually P-S-P converted wave produced as change of a medium from liquid to solid and to liquid.
这种横波实际上是在液-固-液介质变化的情况下经过两次转换的P - S - P波。
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