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.
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。
2
Signal shock and precursory earthquakeswarm and foreshock activities always accompany the anomalous space-time patterns of seismic 'ty.
信号震、前兆震群和前震(包括早期前震)的确定应考虑到异常的地震活动时空图象。
3
Abnormal time and shape of earthquakes with magnitude of 5, 6 and 7 (or earthquakeswarmof m 6) are different and have respective features.