The ground will not have time to polarize completely and the decay will have a smaller amplitude.
地层还来不及充分极化，衰减曲线的幅度将比较小。
The results show that the amplitude of the stress signal is the best sensitive to the change of damage among the parameters and it will gradually decay with the increase of damage degree.
结果表明，信号幅值对裂缝损伤的变化最为敏感，且随损伤程度的不断增加呈现出不断衰减的趋势。
Wave amplitude decay in different ways by downward compressive wave and upward wave, the upward wave decay slower than the downward wave.
下行压缩波与上行波衰减规律不同，其中上行拉力波比下行波衰减快；上行压缩波比下行波衰减慢。
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