吉林松原地区b值时间变化特征浅析  

Brief Analysis on the Time Variation Characteristics of B value in Songyuan Area,Jilin Province

作　　者：刘宏岩[1] 陈卓[1] 张仁鹏[1] 张洪艳[1] 卢燕红[1] LIU Hong-yan;CHEN Zhuo;ZHANG Ren-peng;ZHANG Hong-yan;LU Yan-hong(Jilin Earthquake Agency,Jilin Changchun 130117,China)

机构地区：[1]吉林省地震局,吉林长春130117

出　　处：《防灾减灾学报》2023年第1期27-33,共7页Journal of Disaster Prevention And Reduction

摘　　要：利用吉林省地震台网2003年以来正式地震目录,采用最大曲率法计算最小完整性震级MC,计算得到吉林省松原地区的b值时间变化曲线。通过回溯研究区内M≥5.0地震和时间曲线的对应关系发现,该地区M≥5.0地震前b值都有2个月以上明显的加速下降过程,相对的下降幅度为27%~45%。b值在吉林松原地区的地震预报中有一定的可信度,可为日常震情会商和跟踪工作提供量化信息。By using the official earthquake catalogue of Jilin Seismic Network since 2003 and using the maximum curvature method to calculate the minimum integrity magnitude MC,the time variation curve of b value in Songyuan area of Jilin Province is calculated.By backtracking the correspondence between M≥5.0 earthquakes in the study area and the time curve,we found that all the b value in this area had a significant 2 month decline process to a certain extent before M≥5.0 earthquakes,the relative decrease range is 27%~45%.B value has a certain degree of reliability in earthquake prediction in Songyuan area,Jilin Province,and can provide quantitative information for daily earthquake situation consultation and tracking work.

关 键 词：最小完整性震级 B值 震例回溯 

分 类 号：P315.75[天文地球—地震学]