The earth free oscillation can be used to constrain structure of the earth interior, including velocity, discontinuity as well as density distribution.
用地球的自由振荡研究地球内部结构、速度间断面、密度分布等具有射线理论不可替代的优点。
7 are processed, the PSD of Earth free oscillation is obtained.
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.
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。
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