swarm of earthquake

基本解释

Abnormal time and shape of earthquakes with magnitude of 5,6 and 7(or earthquake swarm of M 6) are different and have respective features.
且在异常时间、异常形态上，5级、6级和7级地震（或6级震群）各有其特点和差异。
The existing of earthquake swarm, S wave shadow in some seismic stations and gradually uplifting of surface suggest a magma system beneath these volcanoes.
火山区存在的震群活动、部分台站观测到的S波阴影区以及地表的缓慢抬升等，指示火山区存在一个岩浆系统。
Through analyzing and processing the data of the small earthquakes in West Yunnan since 1970, the definitions of the earthquake swarm and the precursor swarm in the area have been given.
对1970年以来滇西地区中小地震资料进行了分析，给出了滇西地区震群及前兆震群的定义；