一个地区经过地震活动频度相对较高时段以后总是要经过地震活动频度相对较低强度相对较弱的平静时期这种地震活跃期和平静期交替出现的特点被称为地震周期性earthquake periodicity
地震观测数据受各种周期性因素影响，其动态曲线表现为周期性变化特征，是大小不同的周期和非周期因素相互作用的结果。
Seismic observation data are influenced by diverse seasonal factors, its dynamic curve appeared as period change feature that is interact results of period or un-period factors.
模拟的苏门答腊俯冲带上的大地震在时间上有准周期性，空间上有迁移特征，破裂由深部向浅部进行；
The earthquakes simulated by the model on the Sumatra subduction zone have characteristics of quasi-cycle in time and migration in space. The earthquake ruptures propagate upward from bottom.
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