运用尾波干涉技术监测2005年江西九江-瑞昌M_(S)5.7地震后地壳介质变化

Monitoring Variations of Crustal Media after the Jiujiang-Ruichang M_(S)5.7 Earthquake in Jiangxi Province in 2005 by Coda Wave Interferometry

基于2005年江西九江—瑞昌M_(S)5.7地震序列事件波形及其观测报告,采用双差重定位法、波形互相关法和尾波干涉法,筛选出了同时被范镇台和九江台记录且波形互相关系数≥0.940的两组重复地震对:D1(2005-11-2909:13M_(L)2.0和2005-12-0204:54M_(L)1.9)和D2(2005-12-0223:49M_(L)2.2、2005-12-0616:58M_(L)1.7和2006-03-2406:24M_(L)2.4)。发现M_(S)5.7地震后短期内(2005-11-29—2005-12-02)S波早期尾波波速增加;而M_(S)5.7地震后几个月时间内(2005-12-02—2006-03-24)S波早期尾波波速减小。

Based on the event waveform data and its observation report of the Jiujiang-Ruichang M_(S)5.7 earthquake sequence in Jiangxi in 2005,by using the double-difference method,waveform cross-correlation and coda wave interferometry,two groups of repeated earthquakes(cc≥0.940,recorded by Fanzhen station and Jiujiang station)can be obtained:D1(2005-11-2909:13 M_(L)2.0 and 2005-12-0204:54 M_(L)1.9)and D2(2005-12-0223:49 M_(L)2.2,2005-12-0616:58 M_(L)1.7 and 2006-03-2406:24 M_(L)2.4).It is found that the velocity of early coda wave of S wave increases in the early short period(from 2005-11-29 to 2005-12-02)after the M_(S)5.7 earthquake and decreases within a few months after the M_(S) 5.7 earthquake(2005-12-02-2006-03-24).