7级大地震数据进行处理，获得地球自由振荡的功率谱密度。
7 are processed, the PSD of Earth free oscillation is obtained.
在导翼中自由振荡的球有利于全流道流动，最大限度减小湍流和振荡。
Free oscillation of ball in guide ribs facilitates full port flow with minimum turbulence and chatter.
利用天然地震波测量Q值的主要方法有：利用地球自由振荡资料、利用体波、利用面波和利用尾波来研究Q值。
The major methods of measuring Q-value by the natural earthquakes are the ones of using the data of free vibration of earth, body wave, surface wave and coda.
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