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前言 近几年来,国内外对震群的研究越来越广泛深入,研究内容已由过去对单个震群特性的研究进而对一定时空范围内众多震群的共同特性进行研究,并依据这些特性制定出一些判定指标来区分什么是前兆震群,什么是一般震群或后效震群等等。最终找出震群活动与中强地震之间的联系。近几年来,一些作者提出了用h值、U值、K值等作为前兆震群的判定指标。研究结果表明,当一个震群或地震序列的h值小于1或U值大于0.5
Preface In recent years, the research on swarm at home and abroad has been more and more in-depth. The research content has been studied from the previous research on the characteristics of a single swarm, and then studied the common characteristics of many swarm within a certain space-time range, and based on these characteristics Some judgments to distinguish between what is a precursor earthquake swarm, what is the general swarm or post-swarms and so on. Finally find the connection between the earthquake swarm activity and the strong earthquake. In recent years, some authors have proposed the judging index using h value, U value and K value as precursory swarm. The results show that when the value of h is less than 1 or the value of u is greater than 0.5 for a swarm or earthquake series