Double Difference Relocation and Focal Mechanisms of the Jinggu Ms6.6 Earthquake Sequences in Yunnan Province in 2014
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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.
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关键词:
- 景谷Ms6.6地震序列 /
- 双差重定位 /
- 震源机制 /
- 天然地震
Abstract: The research of Yunnan Jinggu earthquake is not so intensive. To discuss the seismogenic structure and distribution of sequences of Jinggu Ms6.6 earthquake, 7 October 2014, we relocated the mainshock by using the 3D velocity model of Yunnan and Sichuan province (Loc3dSB), and then relocated the sequences during 7th to 31th October 2014 using the double-difference relocation algorithm, by using and phase data from seismic network of Yunnan province. Furthermore the focal mechanism solutions are derived by using P-wave polarity first-motion and amplitude ratio method. The sequences appear to be strike-slip type mostly, with the principal compressive stress axis trends both NNE and NE directions. And the sequences are distributed dominantly linearly shaped in the NW direction with its southeast endpoint appears deeper than northwest. Both of which indicate that the early major rupture plane is the NW nodal plan, appears to be a right-lateral strike-slip faulting with a small normal component. Meanwhile the linearly shaped distribution and focal mechanisms varies with locations on different segments, with clear end-points and transform segment. Furthermore, aftershocks at SE end-point expand gradually to new geometrically unclear segment, which may indicate another rupture. -
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 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 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 
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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
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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°
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