原因在于问题的复杂性和信息的缺乏，我们不清楚在纷繁复杂的断层周围，压力是如何在一些地方聚集又在另一些地方释放的。
That is because of the complexity of the problem and the lack of information about how the stresses around the cat's cradle of neighbouring faults accumulate in some places and are relieved in others.
在更小的尺度上，埃特纳周围的辐射式断层可以与之相提并论。
On a smaller scale, comparable faults radiate into the landscape around Etna.
计算结果表明，在地表断层出露的周围地区，断层下盘地表地震动放大效应较大，断层上盘地表地震动放大作用有明显的降低。
Calculated results indicate that amplification effect is obvious in the area near surface fault, especially on the site that is in the downside fault.
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