在一次地震序列中主要的地震能量分两次释放的强震称双震型强震。
Those strong earthquakes, the main energy of which is released twice in one earthquake sequence are defined as strong double earthquakes.
分析地震序列前期的时频度衰减曲线有可能区分出多震型地震，但快速区分间歇双震型和震群型地震较为困难。
By analyzing the early phase of frequency decay, it is possible to identify multi-shock earthquake sequence, but it is difficult to rapidly judge intermittent double-shock and swarm.
对于隔震结构，工程设计和研究中经常采用双自由度体系模型。
The isolated structure is represented by an equivalent 2-dof system, which is frequently adopted in engineering design and research.
对于隔震结构，工程设计和研究中经常采用双自由度体系模型。
The isolated structure is represented by an equivalent 2-dof system, which is frequently adopted in engineering design and research.
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