东北地区地倾斜存在远离震源的特征迁移；
The characteristics of ground tilts near the source in Northeast China region migrated away.
这种迁移现象反映出大震前远震源区和近震源区内地震活动交替活跃和平静的过程。
The migration phenomena reveal a process that the seismicity in both the far-field and the near-field becomes intensive and quiet alternatively before a main shock.
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