Study on tectonic stress field in Yingjiang area based on multi-focal mechanism solution sequence
-
摘要: 文章搜集了盈江地区多个地震序列震源机制解共计162个，对从苏典断裂到大盈江断裂的区域进行了构造应力场反演。研究结果表明，该区域总的主压应力轴方向为NNE—SSW向。并从内在动力学演化的角度分析了2008年3月21日—2014年5月30日发生的6次震群活动，发现其存在明显的相互联系性。研究还发现，局部也出现应力场偏转的现象，苏典断裂南端的主压应力轴向北偏转角度变大，这可能与该区形成的三角凹陷有关。此外，本文还搜集到2016—2020年之间发生于盈江地区的1003个地震目录，通过分析发现昔马—盘龙山断裂到大盈江断裂之间的区域可能存在应力场闭锁，因此，加强该区域的危险性防范至关重要。Abstract: In this paper, a total of 162 focal mechanism solutions are collected from several focal mechanism solution sequences in Yingjiang area, and the tectonic stress field inversion is carried out from Sudian fault to Dayingjiang fault. The results show that the axial direction of the total principal compressive stress in this area is NNE—SSW. The six earthquake swarm activities from March 21, 2008 to May 30, 2014 were analyzed from the perspective of internal dynamic evolution, and it was found that there were obvious interrelationships among them. It is also found that the deflection of stress field occurs locally. The deflection angle of principal compressive stress axis at the southern end of Sudian fault becomes larger, which may be related to the triangular depression formed in this area. In addition, 1003 earthquake catalogues occurred in Yingjiang area from 2016 to 2020 were collected in this paper. Through analysis, it is found that there is stress locking in the area between Xima-Panlongshan fault and Dayingjiang fault, so it is very important to strengthen the risk prevention in this area.
-
Key words:
- Yingjiang area /
- focal mechanism /
- stress field inversion /
- earthquake catalogue
-
图 1 盈江地区4次地震序列震源机制解（MW≥3.0）持续时间与震级关系图（M-t图）
Figure 1. Relationship between duration and magnitude of four focal mechanism solutions （MW≥3.0） in Yingjiang area（M-t diagram）
图 2 地震序列震源机制解及相应区域的P轴、T轴赤平投影分布图
F1：怒江断裂；F2：龙陵—瑞丽断裂；F3：固东—腾冲断裂；F4：猴桥—中和断裂；F5：槟榔断裂；F6：苏典断裂； F7：昔马—盘龙山断裂；F8：大盈江断裂；F9：瓦德龙断裂。图中分别给出了2008年3月21日震源机制解 序列P轴、T轴分布、2008年8月21日震源机制解序列P轴、T轴分布、2008年9月3日震源 机制解序列P轴、T轴分布、2011年3月10日震源机制解序列P轴、T轴分布
Figure 2. Sequence of focal mechanism solutions and stereographic projection distribution of P-axis and T-axis in corresponding areas
F1：Nujiang fault；F2：Longling-Ruili fault；F3：Gudong-Tengchong fault；F4：Houqiao-Zhonghe fault；F5：Binglang fault； F6：Sudian fault；F7：Xima-Panlongshan fault；F8：Dayingjiang fault；F9：Wadelong fault. The distribution of P-axis and T-axis of focal mechanism solution sequence on March 21，2008，P-axis and T-axis distribution of focal mechanism solution sequence on August 21，2008，P-axis and T-axis distribution of focal mechanism solution sequence on September 3，2008 and P-axis and T-axis distribution of focal mechanism solution sequence on March 10，2011 are shown in the figure
图 3 各区构造应力场反演结果示意图及相应的R值柱状分布图
图中（a） 、 （b） 、 （c） 、 （d）分别表示2008年3月21日、2008年8月21日、2008年9月3日和2011年3月10日 4组震源机制解序列的构造应力场球面投影图；图中红色散点代表σ1分布图、绿色散点代表σ2分布图， 蓝色散点代表σ3分布图；右边条形柱状图为相应的R值分布
Figure 3. Schematic diagram of inversion results of tectonic stress field in each area and corresponding R value columnar distribution map
The figures （a） ， （b） ， （c） and （d） show the spherical projection of tectonic stress field of four focal mechanism sequences on March 21，2008，August 21，2008，September 3，2008 and March 10，2011；red scatter points represent σ1 distribution map，green scatter points represent σ2 distribution map，and blue scatter points represent σ3 distribution map；bar charts on the right show corresponding R value distribution
图 5 盈江地区2016年1月1日—2020年2月29日震级-时间序列关系图（M-t图）
Figure 5. Magnitude-time series diagram of Yingjiang area from January 1，2016 to February 29，2020 （M-t diagram）
图 6 2016年1月1日—2020年2月29日地震空间分布图
图中3条黑色线段表示断裂，具体名称参见图2所示，红色箭头方向为相应的4次构造应力场 反演主压应力方向，椭圆所画出的区域为应力闭锁区域
Figure 6. Spatial distribution map of earthquakes from January 1，2016 to February 29，2020
The three black lines with specific names in the figure indicate the faults. The direction of the red arrow is the direction of the principal compressive stress inversed from the corresponding fourth tectonic stress field，and the area drawn by the ellipse is the stress locking area
表 1 各分区构造应力反演结果
Table 1. Inversion results of tectonic stress in each subarea
震源机制解序列主震
发震时间（年-月-日）σ1 σ2 σ3 反演震源机
制解个数/个R 走向/° 倾伏角/° 走向/° 倾伏角/° 走向/° 倾伏角/° 2008-03-21 39.90 7.10 −121.30 82.50 130.20 2.40 17 0.58 2008-08-21 35.30 14.40 −145.80 75.60 −54.80 0.30 36 0.16 2008-09-03 −143.60 3.80 30.00 86.20 126.40 0.40 48 0.62 2011-03-10 15.00 7.20 132.30 74.70 −76.70 13.50 61 0.38 
下载: 导出CSV
-
[1] 赵旭,黄志斌,房立华. 2014年云南盈江Ms6.1地震震源机制研究[J]. 中国地震,2014,30(3):462-473 doi: 10.3969/j.issn.1001-4683.2014.03.019Zhao Xu,Huang Zhibin,Fang Lihua. The study on focal mechanism of the Ms6.1 Yingjiang,Yunnan earthquake[J]. Earthquake Research in China,2014,30(3):462-473 doi: 10.3969/j.issn.1001-4683.2014.03.019 [2] 季建清,钟大赉,张连生. 滇西南新生代走滑断裂运动学、年代学、及对青藏高原东南部块体运动的意义[J]. 地质科学,2000,35(3):336-349 doi: 10.3321/j.issn:0563-5020.2000.03.009Ji Jianqing,Zhong Dalai,Zhang Liansheng. Kinematics and dating of cenozoic strike-slip faults in the Tengchong area,west Yunnan:Implications for the block movement in the southeastern Tibet plateau[J]. Scientia Geologica Sinica,2000,35(3):336-349 doi: 10.3321/j.issn:0563-5020.2000.03.009 [3] 张丽娜,韩立波,罗艳. 2014年5月云南盈江两次中强地震震源参数研究[J]. 地震,2016,36(1):59-68 doi: 10.3969/j.issn.1000-3274.2016.01.007Zhang Lina,Han Libo,Luo Yan. Source parameters of May 24,2014 MS5.6 and May 30,2014 MS6.1 earthquakes in Yingjiang,Yunnan Province[J]. Earthquake,2016,36(1):59-68 doi: 10.3969/j.issn.1000-3274.2016.01.007 [4] 徐甫坤,张彦琪,苏有锦. 2014年云南盈江MS6.1地震前后序列分布差异研究[J]. 地震研究,2015,38(4):525-534 doi: 10.3969/j.issn.1000-0666.2015.04.002Xu Fukun,Zhang Yanqi,Su Youjin. Research on difference of sequence distribution before and after Yingjiang MS6.1 earthquake in Yunnan Province in 2014[J]. Journal of Seismological Research,2015,38(4):525-534 doi: 10.3969/j.issn.1000-0666.2015.04.002 [5] 房立华,吴建平,张天中,等. 2011年云南盈江MS5.8地震及其余震序列重定位[J]. 地震学报,2011,33(2):262-267 doi: 10.3969/j.issn.0253-3782.2011.02.013Fang Lihua,Wu Jianping,Zhang Tianzhong,et al. Relocation of mainshock and aftershocks of the 2011 Yingjiang MS5.8 earthquake in Yunnan[J]. Acta Seismologica Sinica,2011,33(2):262-267 doi: 10.3969/j.issn.0253-3782.2011.02.013 [6] 黄小龙,吴中海,赵小艳,等. 2014年5月云南盈江MS5.6、MS6.1地震发震构造分析[J]. 地球学报,2015,36(6):761-770 doi: 10.3975/cagsb.2015.06.08Huang Xiaolong,Wu Zhonghai,Zhao Xiaoyan,et al. Seismogenic structure of 2014 MS5.6 and MS6.1 earthquakes in Yingjiang,Yunnan Province[J]. Acta Geoscientica Sinica,2015,36(6):761-770 doi: 10.3975/cagsb.2015.06.08 [7] 杨婷,吴建平,房立华,等. 2014年云南盈江MS5.6和MS6.1地震余震序列重定位[J]. 地震地质,2016,38(4):1047-1057 doi: 10.3969/j.issn.0253-4967.2016.04.019Yang Ting,Wu Jianping,Fang Lihua,et al. Relocation of main shock and aftershocks of the 2014 Yingjiang MS5.6 and MS6.1 earthquakes in Yunnan[J]. Seismology and Geology,2016,38(4):1047-1057 doi: 10.3969/j.issn.0253-4967.2016.04.019 [8] 罗艳, 包丰, 倪四道, 等. 2008年云南盈江MS5.9地震序列初步研究[C]//中国地球物理学会. 中国地球物理学会第二十七届年会论文集. 北京: 中国地球物理学会, 2011: 422Luo Yan, Bao Feng, Ni Sidao, et al. Study on the 2008 MS5.9 earthquake sequence in Yingjiang, Yunnan Province[C]//Chinese Geophysical Society. Proceedings of the 27 the Annual Meeting of Chinese Geophysical Society. Beijing: Chinese Geophysical Society, 2011: 422 [9] 赵小艳,韩立波,龙锋. 2011年盈江MS≥4.0地震序列震源机制解与发震构造研究[J]. 地震研究,2012,35(4):477-484 doi: 10.3969/j.issn.1000-0666.2012.04.006Zhao Xiaoyan,Han Libo,Long Feng. Focal mechanism solutions and seismologenic structures of Yingjiang MS≥4.0 earthquake sequence in 2011[J]. Journal of Seismological Research,2012,35(4):477-484 doi: 10.3969/j.issn.1000-0666.2012.04.006 [10] 谢富仁,刘光勋,梁海庆. 滇西北及邻区现代构造应力场[J]. 地震地质,1994(4):329-338Xie Furen,Liu Guangxun,Liang Haiqing. Recent tectonic stress field in northwest Yunnan Province and its adjacent areas[J]. Seismology and Geology,1994(4):329-338 [11] 徐彦. 云南地区ML3.0级以上中小地震-震源机制解汇编（2008—2012）[M]. 云南: 云南科技出版社, 2013Xu Yan. Decollection of focal mechanism of moderate and small earthquakes with ML3.0 or higher in Yunnan area （2008—2012）[M]. Yunnan: Yunnan Science and Technology Press, 2013 [12] 张艳凤,常祖峰,彭永中,等. 2014年云南盈江6.1级地震宏观异常及其与构造关联性讨论[J]. 地震研究,2018,41(1):148-156,158 doi: 10.3969/j.issn.1000-0666.2018.01.019Zhang Yanfeng,Chang Zufeng,Peng Yongzhong,et al. Discuss on macro-annomalies of the Yunnan Yingjiang M6.1 earthquake and its relation of tectonics[J]. Journal of Seismological Research,2018,41(1):148-156,158 doi: 10.3969/j.issn.1000-0666.2018.01.019 [13] 常祖峰,安晓文,张艳凤. 畹町断裂晚第四纪活动与水系构造变形[J]. 地震地质,2012,34(2):228-239 doi: 10.3969/j.issn.0253-4967.2012.02.003Chang Zufeng,An Xiaowen,Zhang Yanfeng. Study on Late-quaternary activity and displacement of drainage systems along the Wanding fault[J]. Seismology and Geology,2012,34(2):228-239 doi: 10.3969/j.issn.0253-4967.2012.02.003 [14] Martínez-Garzón P,Kwiatek G,Ickrath M,et al. MSATSI:A MATLAB packege for stress inversion combining solid classic methodology,a new simplified user-handling,and a visualization tool[J]. Seismol. Res. Lett.,2014,85(4):896-904 doi: 10.1785/0220130189 [15] Hardebeck J L,Michael A J. Damped regional-scale stress inversions:Methodology and examples for southern California and the Coalinga aftershock sequence[J]. J. Geophys. Res.,2006,111(B11):B11310 doi: 10.1029/2005JB004144 [16] Vidale J E,Shearer P M. A survey of 71 earthquake bursts across southern california:Exploring the role of pore fluid pressure fluctuations and aseismic slip as drivers[J]. J. Geophys. Res.,2006,111(B5):B05312 [17] Harris R A. Introduction to special section:Stress triggers,stress shadows,and implications to seimic hazard[J]. J. Geophys. Res.,1998,103(B10):24347-24358 doi: 10.1029/98JB01576 [18] 邓菲,刘杰. 2008年盈江地震序列的震源参数和震源机制相关系数研究[J]. 地震,2014,34(2):22-34 doi: 10.3969/j.issn.1000-3274.2014.02.003Deng Fei,Liu Jie. Source parameters and correlation coefficients of focal mechanisms for the 2008 Yingjiang earthquake sequence[J]. Earthquake,2014,34(2):22-34 doi: 10.3969/j.issn.1000-3274.2014.02.003 [19] 谢富仁, 苏刚, 崔效锋, 等. 滇西南地区现代构造应力场分析[J]. 地震学报, 2001, 23（1）: 17-23Xie Furen, Su Gang, Cui Xiaofeng, et al. Modern tectonic stress field in southwest Yunnan, China[J]. Acta Seismologica Sinica, 2001, 14（1）: 17-23 -
点击查看大图
计量
- 文章访问数: 293
- HTML全文浏览量: 210
- PDF下载量: 36
