These instruments measure tilts int the ground's surface, as well as changes in the magnetic field near active faults . Usually these changes precede the occurrence of some earthquakes.
他们还用各种各样的仪器和方法，通过测量地震前发生的地球物理上的变化，如地表倾斜度和 活性断层附近的磁场变化，对地震进行预测。
In the structural plane occurrence measurement by the conventional method in the under-investigation area that is under the interference of a strong magnetic field, the data obtained are often unreal.
在强磁场干扰的调查区域，应用传统的结构面产状测量方法所测得的产状数据不真实。
After the occurrence of flares either the arrangement of magnetic polarity or the neutral line of the longitude field tends to a relatively stable state.
在耀斑爆发后，无论是磁极性排列和纵场中性线都趋于相对稳定状态。
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