横波对随机孔隙岩石的分辨率比纵波高，横波对随机介质各向异性，特别是对微裂隙相当敏感。
The resolving power of S-wave on random porous rock is stronger than that of P-wave, and S-wave is more sensitive to anisotropy caused by micro-cracks.
低频、高孔隙度条件更有利于慢纵波的观测。
It is easy to observe slow P-wave in the condition of large porosity and low frequency band.
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