Relocation of the 2014 Ludian MS6.5 earthquake and its large aftershock sequence
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摘要: 本文采用云南测震台网的观测报告数据，利用双差定位方法对2014年鲁甸MS6.5地震及其强余震序列进行了重定位，获得了3 658个地震事件的震源参数。重定位后地震序列的震中分布显示，余震分布存在两个优势方向，分别为近EW向和SES向，呈共轭型分布，近EW向条带展布长度为30 km，SES 向条带展布长度为20 km；震源深度的分布显示，地震序列总体表现为主震附近震源较深，沿近EW向和SES向逐渐变浅，地震序列的震源深度主要分布在4—20 km范围内。截至2017年2月28日，鲁甸MS6.5地震震源区共发生（同一天发生的一组地震算一次）MS≥4.5强余震4次。重定位后的鲁甸4次强余震序列震中分布存在差异：2014年9月10日和10月27日两次强余震序列的展布特征与主震相同，而2016年和2017年另外两次强余震的后续余震仅分布在强余震的周边，与主震序列明显不同。综合重定位后余震序列分布、震源区地质调查资料以及前人研究认为，鲁甸地震的4次强余震序列是区域应力场和主震引发的震源区应力场共同作用的结果，2014年9月10日和10月27日的两次强余震序列主要受主震引发的震源区应力场的影响；而2016年和2017年两次强余震序列则主要受区域应力场的影响。Abstract: We use catalog data recorded by Yunnan seismic network to relocate the 2014 Ludian MS6.5 earthquake and its aftershock sequence with double-difference location algorithm, and obtain focal parameters of 3 658 earthquakes. The results show that the relocated epicenter distribution of Ludian MS6.5 earthquake sequence exhibits two predominant directions, approxi-mately EW and SES, and conjugated to each other. The length of the EW strip is about 30 km, while the length of SES strip is about 20 km. The Ludian earthquake sequence mainly distri-buted between 4−20 km in depth. It is deeper around the mainshock and becomes shallower along the strips. There are fourMS≥4.5 large aftershocks （the earthquakes that occurred on the same day counts as one） occurred in the Ludian MS6.5 earthquake source region till February 28, 2017. The distributions of four strong aftershock sequences are different from each other after relocation. The distributions of aftershock sequences of MS4.7 occurred in September 10 and MS4.6 occurred in October 27 are similar with the mainshock sequence, while the aftershock sequences located around 2016 MS4.7 earthquake and 2017 MS4.9 earthquake are different from the mainshock sequence. Synthesizing the distribution of relocated Ludian MS6.5 earthquake sequence, geologic data in studied area and previous researches, we draw the following conclusion: the distribution of four strong aftershock sequences are resulted from combined action of regional stress field and source stress field caused by the mainshock, the strong aftershock sequences occurred in September 10 and October 27 in 2014 are mainly influenced by source stress field induced by the mainshock, while the strong aftershock sequences occurred in 2016 and 2017 are mainly influenced by regional stress field.
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图 1 2014年鲁甸MS6.5地震震源区附近的台站分布
Figure 1. The distribution of stations near Ludian 2014 MS6.5 earthquake source region
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图 2 云南地震台网测定的鲁甸地震序列原始定位结果
Figure 2. Initial location of Ludian earthquake sequence by Yunnan seismic network
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图 3 鲁甸地震序列P波和S波的震相走时曲线
Figure 3. Travel time curves of P and S phases for the 2014Ludian earthquake sequence
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图 5 重定位后鲁甸地震序列沿AA′，BB′，CC′，DD′，EE′和FF′深度剖面的分布
Figure 5. Distribution of relocated Ludian earthquake sequence along the depth profiles ofAA′，BB′，CC′，DD′，EE′ and FF′
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图 6 4次强余震发生后30天内小震震中分布
Figure 6. Distribution of earthquakes occurred in 30 days after four large aftershocks
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图 7 4次强余震发生后30天内震源深度统计
Figure 7. Focal depth histogram of earthquakes occurred in 30 days after four large aftershocks
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图 4 鲁甸地震序列重定位后的震中分布
Figure 4. The epicentral distribution of Ludian earthquake sequence after relocation
表 2 云南测震台网测定的2014年9月至2017年2月间鲁甸地区强余震的震源参数
Table 2 Focal parameters of the strong aftershocks from September 2014 to February 2017 recorded by Yunnan seismic network
发震时刻 北纬/° 东经/° 深度/km MS 年−月−日 时：分：秒 2014−09−10 16：59：29 27.11 103.37 9.0 4.7 2014−10−27 00：02：28 27.11 103.33 6.0 4.6 2016−08−12 14：56：54 27.03 103.37 14.0 4.7 2016−08−12 19：25：20 27.03 103.39 7.0 4.7 2017−02−08 19：11：38 27.07 103.35 10.0 4.9 
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表 3 鲁甸地区速度模型
Table 3 Velocity model of Ludian area
地壳厚度/km vP/（km•s−1） vS/（km•s−1） 0—2 5.50 3.179 2—8 5.75 3.324 8—16 6.00 3.468 16—24 6.30 3.642 24—32 5.60 3.240 32—46 6.70 3.873 46＜ 7.70 4.451
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表 4 不同研究给出的余震分布特征
Table 4 Aftershock distribution characteristics from different researchs
来源 近EW向余震
分布长度/kmSES向余震分布
长度/km王未来等（2014） 15 15 张广伟等（2014） 17 22 徐甫坤等（2014） – 15 房立华等（2014） 16 16 本文结果 30 20
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表 1 不同研究分析鲁甸MS6.5地震序列所选取的精定位方法和时间范围
Table 1 Relocation method and time range of Ludian MS6.5 earthquake sequence from several researchs
来源 研究方法 时间范围 王未来等（2014） 双差定位 2014−08−03—2014−08−19 张广伟等（2014） 双差定位 2014−08−03—2014−08−07 徐甫坤等（2014） 双差定位 2014−08−03—2014−08−13 房立华等（2014） 双差定位 2014−08−03—2014−10−03 李艳娥等（2015） 主事件定位 2014−08−03—2014−09−30
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表 5 不同研究给出的重定位误差
Table 5 Relocation error from different researchs
来源 误差 东西向/km 南北向/km 深度/km 发震时刻/s 王未来等（2014） 0.800 0.712 1.520 0.220 张广伟等（2014） 0.44 0.57 1.23 – 徐甫坤等（2014） 0.80 0.90 1.50 0.33 房立华等（2014） 0.42 0.37 0.74 0.18 本文结果 0.274 0.272 0.623 0.226
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