Monitoring variations of crustal media after the MS4.6 Ruichang-Yangxin earthquake by coda wave interferometry
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摘要: 基于2011年瑞昌—阳新MS4.6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，筛选出了同时被黄梅台和九江台记录且波形互相关系数≥0.920的两组重复地震对：D1（2011-09-11 05:44 ML2.3和2011-10-24 08:06 ML2.2）和D2（2011-09-18 07:06 ML2.8和2011-10-2408:06 ML2.2），发现瑞昌—阳新MS4.6地震后1.5个月内（2011-09-11—10-24）震源区S波早期尾波波速增加。
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关键词:
- 瑞昌—阳新MS4.6地震 /
- 重复地震 /
- 尾波干涉法 /
- 地壳介质变化
Abstract: Based on the event waveform data and its observation report of the 2011 Ruichang-Yangxin MS4.6 earthquake sequence processed by the double-difference method, waveform cross-correlation and coda wave interferometry, two groups of repeating earthquakes (cc≥0.920, recorded by station Huangmei and station Jiujiang) can be obtained: D1 (2011-09-11 05:44 ML2.3 and 2011-10-24 08:06 ML2.2) and D2 (2011-09-18 07:06 ML2.8 and 2011-10-24 08:06 ML2.2). It could be found that the velocity of early S wave coda increased within 1.5 months (2011-09-11—10-24) in source region after the MS4.6 Ruichang-Yangxin earthquake. -
图 1 研究区地形、台站位置、水体分布、断裂展布及MS4.6主震震中平面图
Figure 1. The distribution map of regional topography, seismic stations, waters, fractures and the MS4.6 earthquake
图 2 MS4.6地震序列重定位后震中位置平面图
Figure 2. Epicenter location plane of the MS4.6 earthquake sequence after relocation
图 3 MS4.6地震序列重定位后的震源深度分布图
Figure 3. Focal depth distribution of the MS4.6 earthquake sequence after relocation
图 4 MS4.6地震及双台记录重复地震位置图 （1为瑞昌—武穴断裂，2为金岭—田塘断裂，3为武山—南阳断裂，4为望夫山—大浪断裂，5为丁家山—桂林桥—武宁断裂，6为刘家—范家铺—城门山断裂，7为襄樊—广济断裂，8为洋鸡山—武山—通江岭断裂，9为郎君山—东雷断裂）
Figure 4. The distribution map of the MS4.6 earthquake and repeating earthquakes recorded by 2 stations
图 5 黄梅台（a）和九江台（b）D1波形记录、不相关系数及走时延迟随时间变化图
Figure 5. The results of waveform, de-correlation and delay time of repeating earthquake D1 with lapse time at station HME (a) and station JIJ (b)
图 6 黄梅台（a）和九江台（b）D2波形记录、不相关系数及走时延迟随时间变化图
Figure 6. The results of waveform, de-correlation and delay time of repeating earthquake D2 with lapse time at station HME (a) and station JIJ (b)
图 7 黄梅台和九江台D1和D2走时延迟随时间变化图 （黄色区域为大致的S波早期尾波部分）
Figure 7. The results of delay time of repeating earthquake D1 and D2 with lapse time at station HME and JIJ
图 8 黄梅台（a）和九江台（b）记录的重复地震对S波早期尾波相对波速变化
Figure 8. Early S coda’s relative wave velocity variation of repeating earthquakes at station HME (a) and JIJ (b)
层数 1 2 3 4 5 6 深度/km 0—3 3—8 8—16 16—25 25—35 35+ vP/（km·s−1） 4.80 5.90 6.10 6.40 6.90 8.00 vS/（km·s−1） 2.80 3.45 3.57 3.62 3.98 4.42 
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表 2 MS4.6地震及双台记录重复地震对信息统计表
Table 2. Statistics of the MS4.6 earthquake and repeating earthquakes recorded by 2 stations
序号 发震时间 北纬/° 东经/° 深度/km 震级 时间间隔/d 水平间距/km 垂直间距/km D0 2011-09-10 23:20 29.713507 115.431649 9.6 MS4.6 − − − D1 2011-09-11 05:44 29.718791 115.446672 6.1 ML2.3 约43 0.5 0.2 2011-10-24 08:06 29.714347 115.442342 6.3 ML2.2 D2 2011-09-18 07:06 29.712360 115.441577 5.7 ML2.8 约36 0.1 0.6 2011-10-24 08:06 29.714347 115.442342 6.3 ML2.2
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表 3 黄梅台和九江台记录的重复地震对S波早期尾波相对波速变化
Table 3. Variation of relative wave velocity of early S coda for repeating earthquakes at station HME and JIJ
台站 序号 事件1 事件2 相对波速变化 − D0 2011-09-10 23:20 − − 黄梅台（HME） D1 2011-09-11 05:44 2011-10-24 08:06 6.2883±0.264548‰ D2 2011-09-18 07:06 2011-10-24 08:06 4.7300±0.344116‰ 九江台（JIJ） D1 2011-09-11 05:44 2011-10-24 08:06 0.47348±0.139689‰ D2 2011-09-18 07:06 2011-10-24 08:06 5.2992±0.325297‰
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表 4 九江台降雨量和气压日平均值统计
Table 4. Daily average statistics of rainfall and pressure at station JIJ
年份 8月 9月 10月 11月 降雨量/mm 气压/hPa 降雨量/mm 气压/hPa 降雨量/mm 气压/hPa 降雨量/mm 气压/hPa 2010 6.1 1010.6 1.8 1011.9 5.8 1014.4 0.6 1014.9 2011 4.6 1007.2 3.0 1010.9 2.5 1015.1 2.1 1015.8 2012 7.8 1006.6 6.3 1012.5 3.4 1014.6 3.2 1013.5
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