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    2014年云南景谷Ms6.6地震序列重定位与震源机制解特征

    徐甫坤 刘自凤 张竹琪 李静 刘丽芳 苏有锦

    徐甫坤, 刘自凤, 张竹琪, 李静, 刘丽芳, 苏有锦, 2015. 2014年云南景谷Ms6.6地震序列重定位与震源机制解特征. 地球科学, 40(10): 1741-1754. doi: 10.3799/dqkx.2015.156
    引用本文: 徐甫坤, 刘自凤, 张竹琪, 李静, 刘丽芳, 苏有锦, 2015. 2014年云南景谷Ms6.6地震序列重定位与震源机制解特征. 地球科学, 40(10): 1741-1754. doi: 10.3799/dqkx.2015.156
    Xu Fukun, Liu Zifeng, Zhang Zhuqi, Li Jing, Liu Lifang, Su Youjin, 2015. Double Difference Relocation and Focal Mechanisms of the Jinggu Ms6.6 Earthquake Sequences in Yunnan Province in 2014. Earth Science, 40(10): 1741-1754. doi: 10.3799/dqkx.2015.156
    Citation: Xu Fukun, Liu Zifeng, Zhang Zhuqi, Li Jing, Liu Lifang, Su Youjin, 2015. Double Difference Relocation and Focal Mechanisms of the Jinggu Ms6.6 Earthquake Sequences in Yunnan Province in 2014. Earth Science, 40(10): 1741-1754. doi: 10.3799/dqkx.2015.156

    2014年云南景谷Ms6.6地震序列重定位与震源机制解特征

    doi: 10.3799/dqkx.2015.156
    基金项目: 

    云南省地震局10项重点工程"前震及其识别技术研究" 2014020101

    详细信息
      作者简介:

      徐甫坤(1986- ) , 男, 博士, 主要从事数字地震学及地震活动性研究.E-mail:flowwwind@gmail.com

    • 中图分类号: P315.3

    Double Difference Relocation and Focal Mechanisms of the Jinggu Ms6.6 Earthquake Sequences in Yunnan Province in 2014

    • 摘要: 针对云南景谷地震序列的特征研究尚浅.为讨论2014年10月7日云南景谷Ms6.6地震的发震构造及序列分布, 利用云南测震台网提供的波形数据及观测报告, 采用MSDP软件中的Loc3dSB(川滇)模型对主震进行了精确定位, 然后利用双差定位法对2014年10月7日至31日期间的余震序列进行了重新定位; 并使用P波初动与振幅比联合反演方法计算了震源机制解.结果显示: 序列以走滑型地震为主, 主压应力具有北北东及北东两个优势方向, 序列分布呈北西向线性展布, 主体分布在西北端较浅而东南端较深的线性区域内, 说明地震的初始破裂面可能为北西向节面, 为一次右旋走滑地震; 余震分布还具有清晰的端点及转换区域, 存在显著的分段差异.另外, 东南端的余震在晚期逐渐转移到几何形态明显不同的段落上, 近期地震危险性值得关注.

       

    • 图  1  重定位使用的数据

      a.台站及序列分布; b.P、S波震相走时

      Fig.  1.  Data used in relocation

      图  2  采用Loc3dSB(川滇)重定位后的景谷Ms6.6主震位置及使用的台站

      Fig.  2.  The relocated epicenter of Jinggu Ms6.6 earthquake after relocation using Loc3dSB and stations used

      图  3  重定位后地震序列震源深度分布

      Fig.  3.  The focal depth distribution of the earthquake sequences after relocation

      图  4  采用双差定位法得到的序列震中分布

      a.序列在水平面上的分布;b.沿AA′剖面的投影;c.沿BB′剖面的投影;图中的六角形和圆圈分别表示重定位后的主震和余震序列

      Fig.  4.  Distributions of the sequences from double-difference relocation algorithm

      图  5  地震沿剖面的时间演化特征

      a.AA′剖面;b.BB′剖面

      Fig.  5.  The temporal variations of earthquake distribution along profiles

      图  6  序列早期演化特征

      a.震源深度随时间的演化;b.余震震中随时间的演化

      Fig.  6.  The early temporal variations

      图  7  不同机构给出景谷地震位置及震源机制解

      地形数据据ASTER GDEM,参考断层据云南省地震局(2014)

      Fig.  7.  The focal mechanism solutions of mainshock

      图  8  序列的震源机制解及M-t

      Fig.  8.  The focal mechanisms and M-t diagram of sequences

      图  9  序列的震源机制解、P轴玫瑰图及在深度剖面上的投影

      Fig.  9.  The focal mechanisms, rose diagrams of P-axis and the distributions of focal depth profile of the sequences

      图  10  主震破裂滑动量分布及地震在破裂面上的投影

      箭头指向代表滑移方向,箭头长度和背景颜色均代表滑移量;圆圈代表余震,圆圈大小代表震级

      Fig.  10.  The slip distribution of main shock and the earthquakes projected on the fault plane

      图  11  2014年10月7日至2015年4月30日序列分布

      Fig.  11.  Distribution of the sequence from October 1th, 2014 to April 30th, 2015

      表  1  主震的震源机制解结果

      Table  1.   The focal mechanism solutions of mainshoc

      经度(°E) 纬度(°N) 深度(km) 震级 节面Ⅰ 节面Ⅱ 来源/计算方法
      100.49 23.39 19.7 Ms6.6 142° 71° -175° 50° 85° -19° 本文
      100.50 23.40 7.0 Ms6.6 149° 79° 174° 240° 84° 12° 地球所,CAP
      100.47 23.38 15.0 Mw6.2 140° 75° 160° 235° 71° 16° 地质所,CAP
      100.55 23.35 13.7 Mw6.2 329° 81° -177° 239° 87° -9° HRV_CMT
      下载: 导出CSV

      表  2  序列中较大地震的震源机制解

      Table  2.   The focal mechanism solutions of larger events in sequence

      日期 时间 纬度(°N) 经度(°E) 震级 节面Ⅰ(°) 节面Ⅱ(°)
      倾角 走向 滑动角 倾角 走向 滑动角
      20141007 21∶49∶39 23.38 100.47 6.6 84.92 50.13 -19.37 70.71 141.91 -174.62
      20141007 22∶22∶40 23.38 100.48 3.0 24.81 202.19 35.42 75.92 79.35 110.64
      20141007 22∶38∶50 23.35 100.52 4.7 63.94 92.96 -44.31 51.13 206.17 -145.65
      20141008 00∶38∶47 23.47 100.45 3.3 83.59 266.22 39.57 50.73 170.95 171.71
      20141008 03∶01∶13 23.35 100.50 4.7 68.37 53.30 28.21 63.93 312.12 155.77
      20141008 07∶30∶03 23.38 100.48 3.5 50.14 175.22 -56.60 50.15 309.41 -123.40
      20141008 08∶36∶36 23.45 100.58 2.4 56.36 41.13 -71.89 37.69 190.57 -115.04
      20141008 09∶36∶20 23.43 100.40 3.8 48.44 241.16 -30.79 67.48 352.73 -134.10
      20141008 10∶28∶51 23.35 100.45 3.8 72.77 314.85 58.43 35.53 199.11 149.36
      20141008 10∶54∶59 23.37 100.50 3.4 60.50 48.49 -5.73 85.01 141.32 -150.38
      20141009 00∶39∶11 23.40 100.48 3.0 55.61 38.34 -6.93 84.29 132.27 -145.41
      20141008 13∶57∶22 23.44 100.57 3.4 72.61 240.60 -42.19 50.14 345.76 -157.09
      20141009 04∶50∶24 23.38 100.48 3.4 70.71 55.52 5.38 84.92 323.74 160.63
      20141009 05∶03∶25 23.35 100.50 3.4 73.33 56.04 -31.23 60.22 155.91 -160.70
      20141009 05∶50∶55 23.48 100.43 3.0 57.20 277.53 32.73 62.97 168.33 142.54
      20141009 07∶24∶33 23.43 100.45 3.1 83.72 32.59 13.65 76.43 301.07 173.54
      20141009 13∶32∶02 23.37 100.42 3.3 85.47 226.43 -64.92 25.46 326.01 -169.41
      20141009 13∶41∶06 23.43 100.45 2.8 35.31 47.77 -7.10 85.90 143.57 -125.10
      20141009 15∶53∶25 23.47 100.43 2.8 48.36 304.30 18.88 76.01 201.50 136.78
      20141009 18∶02∶42 23.35 100.50 3.0 71.25 227.34 -36.01 56.17 330.49 -157.24
      20141009 21∶59∶24 23.37 100.45 3.8 78.69 73.67 -33.34 57.39 171.02 -166.54
      20141010 00∶17∶52 23.38 100.47 4.0 82.56 283.06 -29.15 61.12 17.19 -171.50
      20141010 07∶27∶11 23.35 100.50 3.3 82.95 45.93 -44.56 45.87 142.82 -170.15
      20141010 11∶27∶05 23.42 100.45 3.1 46.92 178.66 -14.51 79.46 278.68 -135.99
      20141010 11∶45∶44 23.42 100.45 3.2 67.48 230.77 -11.15 79.71 325.09 -157.09
      20141010 11∶59∶53 23.42 100.45 3.0 87.50 54.33 -29.91 60.12 145.77 -177.12
      20141011 11∶24∶24 23.35 100.48 3.3 90.00 272.20 35.00 55.00 182.20 180.00
      20141011 11∶47∶24 23.33 100.52 3.4 64.34 63.69 16.10 75.52 326.57 153.43
      20141011 14∶05∶12 23.45 100.43 5.1 83.72 71.62 -13.65 76.43 163.14 -173.54
      20141011 14∶08∶11 23.48 100.45 3.5 60.22 67.99 -19.30 73.33 167.86 -148.77
      20141011 14∶24∶24 23.50 100.43 3.5 61.98 273.38 -21.88 70.79 14.06 -150.17
      20141012 12∶29∶07 23.32 100.48 2.8 56.36 279.33 10.27 81.46 183.60 145.93
      20141012 17∶00∶40 23.33 100.53 3.5 84.28 255.20 34.59 55.61 161.27 173.06
      20141013 09∶57∶02 23.42 100.47 2.8 63.94 75.04 -24.23 68.37 176.22 -151.80
      20141015 03∶08∶39 23.38 100.47 3.6 81.69 48.34 18.26 71.94 315.61 171.26
      20141015 07∶11∶44 23.43 100.47 3.2 86.47 70.60 -44.89 45.22 164.11 -175.02
      20141015 13∶44∶26 23.35 100.48 3.0 48.36 31.00 -18.88 76.01 133.80 -136.78
      20141016 09∶03∶37 23.37 100.43 2.9 74.24 73.25 -19.66 71.11 168.79 -163.32
      20141016 11∶25∶27 23.37 100.48 3.6 55.61 73.46 -6.93 84.29 167.39 -145.41
      20141016 11∶51∶19 23.33 100.47 4.1 42.06 266.40 31.11 69.75 152.27 127.69
      20141016 11∶51∶41 23.38 100.70 3.1 71.11 258.22 47.21 46.03 148.94 153.26
      20141016 18∶46∶23 23.38 100.45 3.5 65.82 51.04 -18.32 73.34 148.76 -154.69
      20141017 14∶20∶25 23.37 100.43 3.7 68.53 251.19 -57.50 38.29 11.07 -143.80
      20141017 14∶53∶10 23.37 100.43 3.7 54.37 254.37 19.53 74.23 152.70 142.75
      20141017 15∶50∶24 23.37 100.43 3.4 69.30 259.11 22.21 69.29 160.90 157.80
      20141018 23∶05∶55 23.35 100.50 4.7 55.61 47.12 -6.93 84.29 141.05 -145.41
      20141019 02∶12∶24 23.35 100.50 3.7 65.41 234.99 -4.63 85.79 326.92 -155.34
      20141019 10∶16∶56 23.40 100.48 3.1 76.00 215.61 -43.22 48.36 318.42 -161.11
      20141020 22∶51∶13 23.48 100.42 3.4 86.79 74.27 -39.89 50.19 166.95 -175.82
      20141020 23∶21∶32 23.43 100.45 3.4 65.60 228.38 -32.73 60.50 333.25 -151.66
      20141021 01∶18∶05 23.48 100.45 2.8 81.46 268.60 34.07 56.36 172.87 169.72
      20141023 03∶20∶27 23.37 100.50 3.1 75.92 233.80 5.24 84.92 142.52 165.86
      下载: 导出CSV

      表  3  不同段上小震震源位置计算得到的断层面走向和倾角

      Table  3.   The strike and dip angles

      位置 走向 倾角
      1区 349° 85°
      2区 339° 86°
      3区 328° 87°
      4区 55° 87°
      下载: 导出CSV
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    • 收稿日期:  2015-02-13
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