利用尾波干涉技术分析寻乌及邻区的地壳介质变化  

Analysis of Variations of Crustal Media in Xunwu and Its Adjacent Area by Coda Wave Interferometry

作　　者：汤兰荣 曾新福 郭雨帆 余思 唐婷婷 王甘娇 TANG Lanrong;ZENG Xinfu;GUO Yufan;YU Si;TANG Tingting;WANG Ganjiao(Jiangxi Earthquake Agency,Nanchang 330096,China)

机构地区：[1]江西省地震局,南昌330096

出　　处：《华北地震科学》2023年第3期67-73,共7页North China Earthquake Sciences

基　　金：中国地震局地震科技星火计划(XH201402Y);江西省防震减灾与工程地质灾害探测工程研究中心开放基金(SDGD202011);江西省自然科学基金项目(20202BABL203035)。

摘　　要：基于波形互相关方法,挑选寻乌及邻区的重复地震事件,利用尾波干涉技术分析重复地震事件发生期间的地壳介质变化。结果显示:多数重复地震对的S波早期尾波部分呈现明显线性变化,反映了地壳介质的波速变化,其中寻乌台南部的2个重复地震对波速变化最为显著,而距离台站相对较远的地震对,波速变化较小;波速变化明显的地区与低b值区一致,也与地震活跃区域相一致。In this paper,we picked out repeating earthquakes based on cross-correlation technology in Xunwu and its adjacent areas,and then detected the variations of crustal media by using coda wave interferometry method during repeating earthquakes.The results show that the linear trend of delay time in early S wave coda of most repeating earthquake pairs are very obvious,which reflects the wave velocity change of crustal media.The two repeating earthquake doublets in the south of Xunwu Station have the most obvious changes in wave velocity,the wave velocity variation relatively far away from stations is small.The area with obvious wave velocity change is consistent with the low b value area and the seismically active area.

关 键 词：寻乌及邻区 重复地震 尾波干涉 B值 地壳介质变化 

分 类 号：P315.6[天文地球—地震学]