Before earthquake occurrence, the crustal deformation causes redistribution of the earth density, so there occur some characteristic changes in the earth gravity field.
地震前，地壳变形引起地球密度重新分布，从而使地球重力场发生某些特征变化。
Before earthquake occurrence, the crustal deformation causes redistribution of the earth density, so there occur some characteristic changes in the earth gravity field.
地震前，地壳变形引起地球密度重新分布，从而使地球重力场发生某些特征变化。
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