The target of second level is avoiding the pipeline divulges after a scenic strong earthquake, leading a higher request to the evaluation of seismic safety for the pipeline engineering sites.

• 其中，第二级以管道不发生泄漏为抗震设防目标，对管道的地震安全性评价工作提出了更高的要求，管道设计需要的地震动和地面永久变形参数也越来越多。