In those regions earthquake swarms have occurred repeatedly in the past . 这些地区以前曾反复出现过地震群。
2.
Anomalous feature of earthquake swarm degree value cv and its application to earthquake prediction 值的异常特征及其在地震预报中的应用
3.
The spatio - temporal evolution characteristics of general earthquake swarms and precursory swarms before and after the tangshan earthquake 唐山大震前后一般震群与前兆震群时空演化特征研究