四川地区震群自动检测与活动特征研究  

Study on the Activity Characteristics of Earthquake Swarms in the Sichuan Region

作　　者：宿君 龙锋[1] 祁玉萍[1] 陈梦蝶 孔令喆 SU Jun;LONG Feng;QI Yuping;CHEN Mengdie;KONG Lingzhe(Sichuan Earthquake Agency,Sichuan Chengdu 610041,China)

机构地区：[1]四川省地震局,四川成都610041

出　　处：《四川地震》2025年第1期1-9,30,共10页Earthquake Research in Sichuan

基　　金：四川省地震局地震科技专项(LY2202);2024年震情跟踪定向工作任务(2024010107);地震科技星火计划项目(XH23033A)。

摘　　要：基于2010—2022年四川地震台网的正式目录,通过自主研发的震群自动检测程序,识别出四川地区130组震群活动。对识别出的震群活动进行时空分布特征研究及参数计算,发现四川地区震群活动的空间分布具有明显的丛集特征,震群活动频次随时间的变化与区域M_(S)≥6.0地震存在一定的时间相关性。特别是在震群活跃频次较高的时期,四川地区100天内活跃震群数量N≥11时,对四川及邻区未来300天内M_(S)≥6.0地震具有较好的指示意义。此外,通过计算震群活动性参数(如U、K、ρ、b、h和F)值,并对单一震群的前兆意义进行研究,发现单一参数难以作为震群类型的划分指标,而复合型参数的判定效能优于单一参数的。Based on the official catalogue of the Sichuan seismic network from 2010 to 2022,we identified 130 groups of earthquake swarm activities through the self-developed automatic earthquake swarm detection program.We have studied the spatial and temporal distribution characteristics of the identified earthquake swarm activities and calculated the parameters.We have found that the spatial distribution of the earthquake swarm activities in the Sichuan region shows obvious clustering characteristics.The frequency of these earthquake swarm activities over time shows a certain temporal correlation with earthquakes above M6.0 in the region.Especially,during periods of high frequency of earthquake swarm activity,when the number of active earthquake swarms(N≥11)within 100 days in Sichuan region,this indicates a good indicator for earthquakes above M6.0 in Sichuan and neighboring are-as in the following 300 days.Moreover,by calculating the activity parameters,such as U value,K value,ρvalue,b value,h value and F value to study the precursor significance of individual earthquake swarm,we have found that a single parameter alone is difficult to be used as the classification index for earthquake swarm types.Instead,a compound parameter method is better than using a single parameter.

关 键 词：震群活动 自动检测 四川地区 中强地震 前兆震群 

分 类 号：P315.7[天文地球—地震学]