该机构警告，强震在接下来几天可能还会持续，直到这一区域地底的地震断层平静下来。
It warned that strong earthquakes could continue for days until the seismic fault line under the area settled.
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.
这种地区叫做平静区。科学家们认为，在这样的地区，二三十年内会发生一次大地震。
In such a region, called a zone of quiescence, the scientists believe, a major quake will take place in 20 to 30 years.
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