The attenuation factor of longitudinal wave was changing linearly, whereas the attenuation factor of the slow shear wave kept nearly constant with a low frequency on the exploration seismic band.
纵波的衰减系数在地震频带内基本上呈线性变化，而横波的衰减系数在地震频带内除低频外基本保持稳定。
Celestial gravitational wave source and the exploration to low frequency gravitational wave have also been discussed.
其中还介绍了天体引力波波源和现在低频引力波的探测现状。
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