The Chilean quake of 1960 shook the entire Earth for many days, a phenomenon called oscillation that was measured by seismic stations around the planet.

1960年的智力地震让地球持续震动了若干天。持续的震动被各地的地震观测站测量到。

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The angular difference between the astronomical axis and the axis of figure called a "nutation" causes an earth orbit al spirical oscillation known as the famous chandler "wobble".

在天文学轴和形状轴之间的角度差称做“章动”，引起地球轨道螺旋摆动，就是著名的卡南德尔“摆动”。

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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。

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