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.
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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