Study on the moment tensor and seismogenic tectonic of the Ninglang MS5.5 Earthquake on January 2, 2022, Yunnan Province
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摘要:
基于云南和四川区域地震台网的数字地震观测资料，采用矩心矩张量反演方法，结合断层失稳参数，对2022年1月2日发生在云南宁蒗的MS5.5地震的震源机制和发震构造进行研究. 结果显示，宁蒗MS5.5地震破裂过程由两个在时间和空间上独立的子地震组成：较大子地震Mmajor占总地震矩的74.7%，矩震级为MW5.2，较小子地震Mminor占总地震矩的25.3%，矩震级为MW4.9，二者均为典型的正断层地震. 断层失稳参数分析显示，Mmajor震源机制解中的节面I对应的断裂，即走向NW、倾向NE的永宁断裂推测其为主发震断裂. 较大余震的震源机制解表明，主震激发了震中区附近的次级断裂的活动. 研究认为，2022年宁蒗MS5.5地震是在区域构造应力场的作用下，永宁断裂继2012年6月24日宁蒗—盐源MS5.7地震后，沿NW方向进一步扩展的结果，反映出该断裂在过去十年中持续积累应力并发生破裂的构造演化特征.
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关键词:
- 2022年宁蒗5.5级地震 /
- 地震矩张量 /
- 震源机制解 /
- CLVD分量
Abstract:Based on digital seismic data from the regional seismic networks of Yunnan and Sichuan, this study investigates the focal mechanism and seismogenic structure of the MS5.5 Ninglang earthquake that occurred on January 2, 2022, using centroid moment tensor inversion combined with fault instability parameter. The results show that the rupture process consisted of two spatially and temporally distinct sub-events. The larger sub-event (Mmajor) accounted for 74.7% of the total seismic moment with a moment magnitude of MW5.2, while the smaller sub-event (Mminor) contributed 25.3% with a moment magnitude of MW4.9. Both sub-events exhibit typical normal faulting characteristics. Fault instability parameter analysis indicates that nodal plane I of the Mmajor focal mechanism corresponds to a NW-striking, NE-dipping fault, consistent with the Yongning fault, which is inferred to be the primary seismogenic fault. The focal mechanisms of the larger aftershocks suggest that the mainshock triggered seismicity on secondary faults near the epicentral area. The results suggest that the 2022 Ninglang MS5.5 earthquake was a continuation of the NW-trending rupture of the Yongning fault under the regional tectonic stress field, following the Ninglang–Yanyuan MS5.7 earthquake on June 24, 2012. This reflects a structural evolution characteristic involving sustained stress accumulation and repeated rupture along the fault over the past decade.
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图 5
偏矩张量解分解(沙滩球直径与M0成正比)
Figure 5.
Decomposition of the Deviatoric MT solution (The radius of the beach ball is proportional to M0.)
图 7
滇西北构造应力场应力莫尔圆与地震震源机制解节面投影
Figure 7.
Mohr circle diagram of tectonic stress field in Northwestern Yunnan and projection of the nodal plane of the focal mechanism solution
表 1
2022年宁蒗5.5级主震和余震定位
Table 1.
Location of Ninglang MS5.5 mainshock and aftershocks on 2022
MS Date Time Depth(km) Lontitude(°) Latitude(°) 5.5 2022-01-02 15:02:07 10 100.65 27.79 4.4 2022-01-05 17:52:49 6 100.64 27.84 4.6 2022-04-16 08:32:14 9 100.62 27.77 4.2 2022-04-17 00:18:37 8 100.61 27.75 4.3 2022-04-30 01:23:49 8 100.61 27.77 
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表 2
地壳速度模型与VR值
Table 2.
Crustal velocity models and VR values
VR(DC) VR(Deviatoric MT) VR(Full MT) VM-1 72% 82% 82% VM-2 72% 82% 82% VM-3 68% 76% 76%
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表 3
2022年宁蒗5.5级地震全矩张量反演结果
Table 3.
Full MT inversion results for the 2022 Ninglang MS5.5 earthquake
Item Value Centroid: Lat./Lon./Depth 27.79°/100.65°/3 km Centroid time (hh:mm:ss.s) 15:02:11.4 M0/MW 9.577 × 1016 N·m / 5.29 Nodal Plane-I: Strike/Dip/Rake 299°/71°/-158° Nodal Plane-II: Strike/Dip/Rake 201°/70°/-20° Uncertainty (2σ): Strike/Dip/Rake 1.0°/2.2°/2.0° DC/CLVD/ISO 56.5%/40.2%/3.3% Uncertainty (2σ): DC/CLVD/ISO 3.8%/6.0%/3.0% M [Mrr/Mtt/Mpp/Mrt/Mrp/Mtp] [-2.19/-3.32/10.55/2.40/0.54/-5.8]
× 1016 N·m
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表 4
偏矩张量解分解结果
Table 4.
Results of deviatoric MT decomposition
Sub-event Nodal Plane-I
Strike/Dip/Rake (°)Nodal Plane-II
Strike/Dip/Rake (°)M0(%) M0(N·m) MW Mmajor 306/59/-143 194/59/-37 74.7 7.154 × 1016 5.2 Mminor 124/61/-147 16/61/-33 25.3 2.423 × 1016 4.9
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表 5
余震矩张量反演结果
Table 5.
Moment tensor inversion results of the aftershocks
MS MW Centroid
Depth(km)VR
(%)DC
(%)CLVD
(%)Strike/Dip/Rake(°) P-axis
Azimuth/Plunge(°)T-axis
Azimuth/Plunge(°)4.4 4.3 4 62 97.6 -2.4 325/41/-103
161/50/-79124/81 244/5 4.6 4.6 4 77 92.2 -7.8 270/89/-175
180/85/-1135/4 45/3 4.2 4.4 4 65 85.8 -14.2 92/81/177
183/87/9317/4 48/9 4.3 4.4 5 73 85.9 -14.1 92/80/-179
2/89/-10316/8 47/6
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表 6
震源机制解节面的失稳参数
Table 6.
Instability parameters of the nodal plane in the focal mechanism solution
Date MS Nodal Plane-I
Strike/Dip/Rake (°)I Nodal Plane-II
Strike/Dip/Rake (°)I 2022-01-02 Mmajor：MW 5.2 306/59/-143 0.9820 194/59/-37 0.3648 Mminor：MW 4.9 124/61/-147 0.7475 16/61/-33 0.7521 2022-01-05 4.4 325/41/-103 0.9691 161/50/-79 0.5567 2022-04-16 4.6 180/85/-1 0.8332 270/89/-175 0.7001 2022-04-17 4.2 183/87/9 0.8120 92/81/177 0.6505 2022-04-30 4.3 2/89/-10 0.8518 92/80/-179 0.6441 2012-06-24 5.7 302/55/-141 0.9896 189/59/-40 0.4355 注：粗体数字表示区域应力场触发的发震断裂产状和对应的失稳参数值.
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Aki K, Richards P G. 1980. Quantitative Seismology: Theory and Methods, Vol. 1. San Francisco, CA: W. H. Freeman.
Anderson E M. 1951. The Dynamics of Faulting and Dyke Formation with Applications to Britain. Edinburgh, U. K. : Oliver and Boyd.
Bouchon M. 1981. A simple method to calculate Green's functions for elastic layered media. Bulletin of the Seismological Society of America, 71(4): 959-971.
Chang Z F, Yang S Y, Zhou Q Y, et al. 2013. Discussion of seismogenic structure of the June 24, 2012 Ninglang-Yanyuan Ms5.7 earthquake. Seismology and Geology (in Chinese), 35(1): 37-49.
Dai B H, Tao Z, Wahab, et al. 2022. Investigation and analysis of seismic damage to rural houses of Ninglang MS 5.5 earthquake. Journal of Natural Disasters (in Chinese), 31(2): 48-55.
Dziewonski A M, Chou T A, Woodhouse J H. 1981. Determination of earthquake source parameters from waveform data for studies of global and regional seismicity. Journal of Geophysical Research: Solid Earth, 86(B4): 2825-2852.
Feng B, Zhu L Y, Hui H, et al. 2022. Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area. Acta Seismologica Sinica (in Chinese), 44(4): 619-631, doi: 10.11939/jass.20210027.
Guiraud M, Laborde O, Philip H. 1989. Characterization of various types of deformation and their corresponding deviatoric stress tensors using microfault analysis. Tectonophysics, 170(3-4): 289-316.
Guo X Y, Wang Z J. 2022. The centroid moment tensor solution of 2022 Menyuan M6.9 earthquake in Qinghai Province. Progress in Earthquake Sciences (in Chinese), 52(2): 55-56.
Hainzl S, Fischer T, Čermáková H, et al. 2016. Aftershocks triggered by fluid intrusion: Evidence for the aftershock sequence occurred 2014 in West Bohemia/Vogtland. Journal of Geophysical Research: Solid Earth, 121(4): 2575-2590.
Hallo M, Opršal I, Asano K, et al. 2019. Seismotectonics of the 2018 northern Osaka M6.1 earthquake and its aftershocks: joint movements on strike-slip and reverse faults in inland Japan. Earth, Planets and Space, 71(1): 34 , doi: 10.1186/s40623-019-1016-8.
Han W B, Jiang G F. 2010. Study on the relation between isoseismic line, aftershock area of strong earthquakes and their seismotectonic environments. Earthquake (in Chinese), 30(4): 32-39.
Hu C Z, Yang P X, Xiong R W. 2012. Brief Seismotectonic analysis of the June 24, 2012 Ninglang-Yanyuan Ms5.7 earthquake. Earthquake (in Chinese), 32(4): 140-147.
Jost M L, Herrmann R B. 1989. A student′s guide to and review of moment tensors. Seismological Research Letters, 60(2): 37-57.
Kagan Y Y. 1991. 3-D rotation of double-couple earthquake sources. Geophysical Journal International, 106(3): 709-716.
Kuang Y Z, Zhang T Y. 2022. Analysis of the sequence type and aftershock characteristics of the Ninglang MS 5.5 earthquake in Yunnan in 2022. Seismological and Geomagnetic Observation and Research (in Chinese), 43(S1): 446-449.
Li J L, Chang Z F, Wan Y G, et al. 2023. Discussion on seismogenic structure of Ninglang MS5.5 earthquake on January. Technology for Earthquake Disaster Prevention (in Chinese), 18(3): 536-547.
Liu J H, Liu F T, Wu H, et al. 1989. Three dimensional velocity images of the crust and upper mantle beneath north-south zone in China. Chinese Journal of Geophysics (Acta Geophysica Sinica) (in Chinese), 32(2): 143-152.
Liu J H, Sun Y X, Bai Y S, et al. 2023. Investigation and analysis of the rural building damage of Ninglang MS5.5 earthquake. Earthquake Engineering and Engineering Dynamics (in Chinese), 43(1): 128-138.
Liu J Q, Zahradník J. 2020. The 2019 MW 5.7 Changning earthquake, Sichuan Basin, China: A shallow doublet with different faulting styles. Geophysical Research Letters, 47(4): e2019GL085408 , doi: 10.1029/2019GL085408.
Liu J Q, Gan W J, Wang G M, et al. 2021. Seismic moment tensor and seismogenic structure of the Yangbi MS6.4 earthquake sequence on May 21, 2021 in Yunnan. Chinese Journal of Geophysics (in Chinese), 64(12): 4475-4487 , doi: 10.6038/cjg2021P0559.
Liang S S, Xu Z G, Sheng S Z, et al. 2020. Focal mechanism solutions and stress field of the 2019 changning, Sichuan mainshock and its moderate-strong aftershocks( MS≥4.0). Seismology and Geology (in Chinese), 42(3): 547-561.
Luo J, Zhao C P, Zhou L Q. 2014. Characteristics of focal mechanisms and stress field of the Chuan-Dian rhombic block and its adjacent regions. Seismology and Geology (in Chinese), 36(2): 405-421.
Qian X D, Su Y J, Li Q. 2012. Analysis for basic characteristic of Ninglang-Yanyuan Ms5.7 earthquake and its precursory anomaly in Yunnan in 2012. Journal of Seismological Research (in Chinese), 35(4): 455-463.
Sheng S Z, Chen G H, Xu X W, et al. 2022. Identification of seismogenic faults between focal nodal planes based on tectonic stress fields with applications to the Yingjiang area. Chinese Journal of Geophysics (in Chinese), 65(11): 4273-4283, doi: 10.6038/cjg2022Q0001.
Vavryčuk V. 2001. Inversion for parameters of tensile earthquakes. Journal of Geophysical Research: Solid Earth, 106(B8): 16339-16355.
Vavryčuk V. 2014. Iterative joint inversion for stress and fault orientations from focal mechanisms. Geophysical Journal International, 199(1): 69-77.
Wallace T C. 1985. A reexamination of the moment tensor solutions of the 1980 Mammoth Lakes earthquakes. Journal of Geophysical Research: Solid Earth, 90(B13): 11171-11176.
Waldhauser F, Ellsworth W L. 2000. A double-difference earthquake location algorithm: Method and application to the northern Hayward fault, California. Bulletin of the Seismological Society of America, 90(6): 1353-1368.
Wan Y G, Huang S H, Wang F C, et al. 2023. Fault geometry and slip characteristics revealed by the 2022 Menyuan earthquake sequence. Chinese Journal of Geophysics (in Chinese), 66(7): 2796-2810, doi: 10.6038/cjg2022Q0345.
Wang G M, Zhu L B, Su Y J, et al. 2015. Accurate location of the June 24, 2012 Ninglang-Yanyuan MS5.7 earthquake. Acta Seismologica Sinica (in Chinese), 37(5): 733-746.
Wang G M, Wu Z H, Liu C W, et al. 2022. Relocation and seismogenic structure analysis of the MS5.5 Ninglang earthquake sequence on January 2, 2022. Acta Seismologica Sinica (in Chinese), 44(4): 581-593 , doi: 10.11939/jass.20220017.
Wang J Z, Wan Y G, Hou J F, et al. 2018. Recent tectonic stress field determination in the central region of Sihuan-Yunnan rhombic block. Earthquake Research in China (in Chinese), 34(4): 632-641.
Wang Q, Li S Y, Li X Y, et al. 2024. Deep tectonics and seismogenic mechanisms of the seismic source zone of the Jishishan MS6.2 earthquake on December 18, 2023, at the northeast margin of the Tibetan Plateau. Earth and Planetary Physics, 8(3), 514–521 , doi: 10.26464/epp2024024.
Wu Z H, Long C X, Fan T Y, et al. 2015. The arc rotational-shear active tectonic system on the southeastern margin of Tibetan Plateau and its dynamic characteristics and mechanism. Geological Bulletin of China (in Chinese),34(1): 1-31.
Xu X W, Wen X Z, Zheng R Z, et al. 2003. Pattern of latest tectonic motion and its dynamics for active blocks in Sichuan-Yunnan region, China. Science in China Series D: Earth Sciences, 46(S2): 210-226.
Xu Z P, Wang F Y, Jiang L, et al. 2018. The depth of Moho interface and crustal thickness in Sichuan-Yunnan region, China. Seismology and Geology (in Chinese), 40(6): 1318-1331.
Xue D F. 1980. Yongning G-47-5 1: 200 000 regional geological survey report (in Chinese). Dali: Regional Survey Team of Yunnan Geological Bureau.
Yi G X, Long F, Liang M J, et al. 2023. Seismogenic structure of the 5 September 2022 Sichuan Luding MS6.8 earthquake sequence. Chinese Journal of Geophysics (in Chinese), 66(4): 1363-1384, doi: 10.6038/cjg2023Q0923.
Zahradník J, Plešinger A. 2010. Toward understanding subtle instrumentation effects associated with weak seismic events in the near field. Bulletin of the Seismological Society of America, 100(1): 59-73.
Zahradník J, Sokos E. 2018. Fitting waveform envelopes to derive focal mechanisms of moderate earthquakes. Seismological Research Letters, 89(3): 1137-1145.
Zeng X F, Han L B, Ni S D, et al. 2013. Inversion for source parameters of the June 24, 2012 Ninglang–Yanyuan Ms5.7 earthquake. Earthquake (in Chinese), 33(4): 196-206.
Zhang H C, Wang S C. 2016. Research on seismic intensity rapid report products reliability. Earthquake Engineering and Engineering Dynamics (in Chinese), 36(5): 65-75.
Zhang J, Yang G L, Tan H B, et al. 2020. Inversion of Moho surface depth in Sichuan-Yunnan area based on the constraint of receiving function. Chinese Journal of Geophysics (in Chinese), 63(7): 2579-2591, doi: 10.6038/cjg2020N0441.
Zhang Z, Xu L S. 2021. The centroid moment tensor solution of the 2021 MW7.5 Maduo, Qinghai, earthquake. Acta Seismologica Sinica (in Chinese), 43(3): 387-391.
常祖峰, 杨盛用, 周青云等. 2013. 2012年6月24日宁蒗—盐源Ms5.7地震发震构造刍议. 地震地质, 35(1): 37-49.
戴必辉, 陶忠, Wahab等. 2022. 宁蒗5.5级地震农房震害调查与分析. 自然灾害学报, 31(2): 48-55.
冯兵, 朱良玉, 惠航等. 2022. 盈江地区构造应力场和断层识别的联合迭代式反演研究. 地震学报, 44(4): 619-631 , doi: 10.11939/jass.20210027.
郭祥云, 汪贞杰. 2022. 年青海门源M6.9地震矩心矩张量解. 地震科学进展, 52(2): 55-56.
韩渭宾, 蒋国芳. 2010. 强震等震线、余震区形状与地震构造关系的研究. 地震, 30(4): 32-39.
胡朝忠, 杨攀新, 熊仁伟. 2012. 2012年6月24日宁蒗—盐源5.7级地震的发震构造浅析. 地震, 32(4): 140-147.
匡泳庄, 张天宇. 2022. 2022年云南宁蒗MS 5.5地震序列类型及余震特征分析. 地震地磁观测与研究, 43(S1): 446-449.
李鉴林, 常祖峰, 万永革等. 2023. 2022年1月2日宁蒗Ms5.5地震发震构造研究. 震灾防御技术, 18(3): 536-547.
刘俊清, 甘卫军, 王光明等. 2021. 2021年5月21日云南漾濞MS6.4地震序列地震矩张量及发震构造. 地球物理学报, 64(12): 4475-4487 , doi: 10.6038/cjg2021P0559.
刘建华, 刘福田, 吴华等. 1989. 中国南北带地壳和上地幔的三维速度图象. 地球物理学报, 32(2): 143-152.
刘建辉, 孙艺璇, 柏亚双等. 2023. 宁蒗5.5级地震村镇房屋震害调查与分析. 地震工程与工程振动, 43(1): 128-138.
梁姗姗, 徐志国, 盛书中等. 2020. 2019年四川长宁6.0级地震主震及中强余震(MS≥4.0)的震源机制及其应力场. 地震地质, 42(3): 547-561.
罗钧, 赵翠萍, 周连庆. 2014. 川滇块体及周边区域现今震源机制和应力场特征. 地震地质, 36(2): 405-421.
钱晓东, 苏有锦, 李琼. 2012. 2012年云南宁蒗—盐源5.7级地震及震前异常分析. 地震研究, 35(4): 455-463.
盛书中, 陈桂华, 徐锡伟等. 2022. 基于构造应力场识别震源机制解节面中发震断层面——以盈江地区为例. 地球物理学报, 65(11): 4273-4283 , doi: 10.6038/cjg2022Q0001.
万永革, 黄少华, 王福昌等. 2023. 2022年门源地震序列揭示的断层几何形状及滑动特性. 地球物理学报, 66(7): 2796-2810 , doi: 10.6038/cjg2022Q0345.
王光明, 吴中海, 刘昌伟等. 2022. 2022年1月2日宁蒗MS5.5地震序列重定位与发震构造分析. 地震学报, 44(4): 581-593 , doi: 10.11939/jass.20220017.
王光明, 朱良保, 苏有锦等. 2015. 2012年6月24日宁蒗-盐源MS5.7地震的精确定位. 地震学报, 37(5): 733-746.
王金泽, 万永革, 侯江飞等. 2018. 川滇菱形块体中部现今构造应力场精确求解. 中国地震, 34(4): 632-641.
吴中海,龙长兴,范桃园等. 2015. 青藏高原东南缘弧形旋扭活动构造体系及其动力学特征与机制. 地质通报, 34(1): 1-31.
薛代福. 1980. 永宁幅G-47-5 1/20万区域地质调查报告. 大理: 云南地质局区调队.
徐锡伟, 闻学泽, 郑荣章等. 2003. 川滇地区活动块体最新构造变动样式及其动力来源. 中国科学: D辑, 33(S1): 151-162.
徐志萍, 王夫运, 姜磊等. 2018. 川滇地区莫霍面深度和地壳厚度. 地震地质, 40(6): 1318-1331.
易桂喜, 龙锋, 梁明剑等. 2023. 2022年9月5日四川泸定MS6.8地震序列发震构造. 地球物理学报, 66(4): 1363-1384, doi: 10.6038/cjg2023Q0923.
曾祥方, 韩立波, 倪四道等. 2013. 2012年6月24日宁蒗—盐源MS5.7地震震源参数研究. 地震, 33(4): 196-206.
张红才, 王士成. 2016. 地震烈度速报产品可靠性分析. 地震工程与工程振动, 36(5): 65-75.
张杰, 杨光亮, 谈洪波等. 2020. 基于接收函数约束的川滇地区莫霍面深度反演研究. 地球物理学报, 63(7): 2579-2591, doi: 10.6038/cjg2020N0441.
张喆, 许力生. 2021. 2021年青海玛多MW7. 5地震矩心矩张量解. 地震学报, 43(3): 387-391.
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