Analysis on InSAR Co-seismic Deformation and Slip Distribution Characteristics of 2020 Jiashi MS 6.4 Earthquake
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摘要: 利用Sentinel-1A升轨和降轨数据，基于D-InSAR技术，获取2020年1月19日伽师MS6.4地震同震形变场，并结合其他研究机构给出的震源机制解参数和已有研究成果，反演得到伽师地震的发震断层几何特征和滑动分布。研究结果表明，伽师地震同震形变在地表有明显差异；升轨同震形变在卫星视线方向北侧抬升55 mm，南侧下降42 mm；降轨同震形变在卫星视线方面北侧抬升63 mm，南侧下降23 mm。通过反演得到发震断层走向为275°，倾角为20°，地震滑动主要分布在地下5 km处，最大滑动量约为0.32 m，平均滑动角为89.3°，累积地震矩为1.46×1018 N·m，合矩震级MW6.1，发震构造为具有少量走滑性质的逆冲断裂。从发震构造特征、同震滑动分布推测，伽师地震发震构造是柯坪塔格褶皱带滑脱面以上沉积盖层内的逆冲断裂，支持了柯坪推覆体的薄皮构造模型观点。Abstract: By using Sentinel-1A ascending and descending data with the method of D-InSAR, the co-seismic deformation of Jiashi earthquake occuring on 19th January 2020 was obtained. Combing with the focal mechanisms given by other research agencies, the geometric characteristics and slip distribution of seismic fault was inversed. Our study result shows that, the co-seismic deformation of Jiashi earthquake has obvious difference on surface: co-seismic deformation of the ascending orbit lifts 55 mm in the north and 42 mm in the south in LOS direction, co-seismic deformation of the descending orbit lifts 63 mm in the north and 23 mm in the south in LOS direction. Inversion result shows that seismic fault strike angle is 275°, dip angle is 20°, seismic slip is mainly distributed at 5 km underground, maximum slip is about 0.32 m, the average slip angle is 89.3°, the cumulative co-seismic moment is 1.46×1018 N·m, which is equal to the moment magnitude of MW6.1, the seismogenic structure is a thrust fault with minor strike slip property. According to the characteristics of seismogenic structure and co-seismic slip distribution, our result indicates that the Jiashi earthquake seismogenic structure is a thrust fault in the sedimentary mantle above the detachment surface of kepingtag fold belt, and supports the thin skinned structural model of Keping nappe.
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Key words:
- Jiashi earthquake /
- InSAR /
- Slip distribution /
- Co-seismic deformation /
- Tectonic characteristics
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图 1 2020年伽师地震区域构造及SAR数据观测范围
Figure 1. Regional tectonics and SAR data range map of 2020 Jiashi earthquake
表 1 干涉影像对参数
Table 1. Parameters of interferometric image pairs
轨道号 飞行方向 主影像时间 副影像时间 时间基线/d 空间基线/m T129 升轨 2020-01-16 2020-01-28 12 12.56 T034 降轨 2020-01-10 2020-01-22 12 57.37 
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表 2 发震断层震源参数对比
Table 2. Focal mechanism parameter comparison of seismic fault
参数来源 经度/° 纬度/° 深度/m 走向/° 倾角/° 滑动角/° 震级/MW 全球矩心矩张量目录 77.19 39.80 12 196 38 31 6.0 美国地质调查局（MWw） 77.11 39.83 19.5 221 20 72 6.0 美国地质调查局（MWb） 77.11 39.83 4 262 9 105 6.1 德国地学中心 77.10 39.80 10 222 15 76 6.1 Yao等（2021） 77.86 39.31 5 269 20 92 6.2 Yu等（2020） 77.30 39.91 6.3 275 9 111 6.1 He等（2021） 77.26 39.91 7.3 275 11 103 6.0 李成龙等（2021） — — 4~6 270 15 85 6.0 张迎峰等（2021） — — 4~13 275 20 90～120 6.0～6.1 张文婷等（2021） 77.28 39.90 5 276 10.7 84.1 6.1 本文 77.33 39.83 5 275 20 89 6.1
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艾力夏提·玉山, 刘代芹, 李杰等, 2018. 西南天山地区长时间尺度重力场变化特征. 震灾防御技术, 13（2）: 388—398 doi: 10.11899/zzfy20180214Ailixiati Y. , Liu D. Q. , Li J. , et al. , 2018. Variation characteristics of long period gravity field in southwestern Tianshan. Technology for Earthquake Disaster Prevention, 13(2): 388—398. (in Chinese) doi: 10.11899/zzfy20180214 邓启东, 冯先岳, 张培震等, 2000. 天山活动构造. 北京: 地震出版社.Deng Q. D., Feng X. Y., Zhang P. Z., et al., 2000. Active tectonics of Tianshan. Beijing: Seismological Press. (in Chinese) 洪顺英, 申旭辉, 单新建等, 2009. 基于D-InSAR技术的西藏改则地震同震形变场特征分析. 地震, 29（4）: 23—31 doi: 10.3969/j.issn.1000-3274.2009.04.003Hong S. Y. , Shen X. H. , Shan X. J. , et al. , 2009. Characteristics of coseismic deformation of the 2008 Gaize, Tibet earthquake based on D-InSAR technology. Earthquake, 29(4): 23—31. (in Chinese) doi: 10.3969/j.issn.1000-3274.2009.04.003 季灵运, 刘传金, 徐晶等, 2017. 九寨沟MS7.0地震的InSAR观测及发震构造分析. 地球物理学报, 60（10）: 4069—4082 doi: 10.6038/cjg20171032Ji L. Y. , Liu C. J. , Xu J. , et al. , 2017. InSAR observation and inversion of the seismogenic fault for the 2017 Jiuzhaigou MS7.0 earthquake in China. Chinese Journal of Geophysics, 60(10): 4069—4082. (in Chinese) doi: 10.6038/cjg20171032 李安, 杨晓平, 冉勇康等, 2016. 南天山低角度逆断层古地震破裂变形模式. 震灾防御技术, 11（2）: 173—185 doi: 10.11899/zzfy20160201Li A. , Yang X. P. , Ran Y. K. , 2016. The paleoearthquake deformation model of the low-angle thrust fault in the south Tianshan. Technology for Earthquake Disaster Prevention, 11(2): 173—185. (in Chinese) doi: 10.11899/zzfy20160201 李成龙, 张国宏, 单新建等, 2021.2020年1月19日新疆伽师县MS6.4级地震InSAR同震形变场与断层滑动分布反演. 地球物理学进展, 36（2）: 481—488 doi: 10.6038/pg2021EE0176Li C. L. , Zhang G. H. , Shan X. J. , et al. , 2021. Coseismic deformation and slip distribution of the MS 6.4 Jiashi, Xinjiang earthquake revealed by Sentinel-1 A SAR imagery. Progress in Geophysics, 36(2): 481—488. (in Chinese) doi: 10.6038/pg2021EE0176 乔学军, 王琪, 杨少敏等, 2014.2008年新疆乌恰MW6.7地震震源机制与形变特征的InSAR研究. 地球物理学报, 57（6）: 1805—1813 doi: 10.6038/cjg20140612Qiao X. J. , Wang Q. , Yang S. M. , et al. , 2014. Study on the focal mechanism and deformation characteristics for the 2008 MW6.7 Wuqia earthquake, Xinjiang by InSAR. Chinese Journal of Geophysics, 57(6): 1805—1813. (in Chinese) doi: 10.6038/cjg20140612 张文婷, 季灵运, 朱良玉等, 2021. 南天山前陆盆地的一次典型逆冲破裂事件——2020年新疆伽师6.4级地震. 地震地质, 43（2）: 394—409 doi: 10.3969/j.issn.0253-4967.2021.02.009Zhang W. T. , Ji L. Y. , Zhu L. Y. , et al. , 2021. A typical thrust rupture event occurring in the foreland basin of the southern Tianshan: the 2020 Xinjiang Jiashi MS6.4 earthquake. Seismology and Geology, 43(2): 394—409. (in Chinese) doi: 10.3969/j.issn.0253-4967.2021.02.009 张迎峰, 单新建, 张国宏等, 2021.2020年MW6.0柯坪塔格地震的变形特征及其对周边地震危险性的启示. 地震地质, 43（2）: 377—393 doi: 10.3969/j.issn.0253-4967.2021.02.008Zhang Y. F. , Shan X. J. , Zhang G. H. , et al. , 2021. The deformation of 2020 MW6.0 Kalpintage earthquake and its implication for the regional risk estimates. Seismology and Geology, 43(2): 377—393. (in Chinese) doi: 10.3969/j.issn.0253-4967.2021.02.008 周传义, 刘国林, 陈洋等, 2019. 基于升降轨Sentinel-1数据分析2017-11-12伊拉克MW7.3地震震源参数. 大地测量与地球动力学, 39（6）: 577—582Zhou C. Y. , Liu G. L. , Chen Y. , et al. , 2019. Analysis of the source parameters of 2017 Iraq MW7.3 earthquake using Sentinel-1 A InSAR data. Journal of Geodesy and Geodynamics, 39(6): 577—582. (in Chinese) Allen M. B. , Vincent S. J. , Wheeler P. J. , 1999. Late Cenozoic tectonics of the Kepingtage thrust zone: interactions of the Tien Shan and Tarim Basin, northwest China. Tectonics, 18(4): 639—654. doi: 10.1029/1999TC900019 He P. , Wen Y. M. , Li S. P. , et al. , 2021. Present-day orogenic processes in the western Kalpin nappe explored by interseismic GNSS measurements and coseismic InSAR observations of the 2020 MW 6.1 Kalpin event. Geophysical Journal International, 226(2): 928—940. doi: 10.1093/gji/ggab097 Huang G. C. D. , Roecker S. W. , Levin V. , et al. , 2017. Dynamics of intracontinental convergence between the western Tarim basin and central Tien Shan constrained by centroid moment tensors of regional earthquakes. Geophysical Journal International, 208(1): 561—576. doi: 10.1093/gji/ggw415 Jónsson S. , Zebker H. , Segall P. , et al. , 2002. Fault slip distribution of the 1999 MW 7.1 Hector mine, California, earthquake, estimated from satellite radar and GPS measurements. Bulletin of the Seismological Society of America, 92(4): 1377—1389. doi: 10.1785/0120000922 Khan N. G. , Bai L. , Zhao J. M. , et al. , 2017. Crustal structure beneath Tien Shan orogenic belt and its adjacent regions from multi-scale seismic data. Science China Earth Sciences, 60(10): 1769—1782. doi: 10.1007/s11430-017-9068-0 Pfiffner O. A. , 2017. Thick-skinned and thin-skinned tectonics: a global perspective. Geosciences, 7(3): 71. doi: 10.3390/geosciences7030071 Wang H. , Wright T. J. , Biggs J. , 2009. Interseismic slip rate of the northwestern Xianshuihe fault from InSAR data. Geophysical Research Letters, 36(3): L03302. Yao Y. , Wen S. Y. , Li T. , 2021. The 2020 MW 6.0 Jiashi earthquake: a fold earthquake event in the southern Tian Shan, Northwest China. Seismological Research Letters, 92(2 A): 859—869. doi: 10.1785/0220200146 Yu C. , Li Z. H. , Penna N. T. , et al. , 2018. Generic atmospheric correction model for Interferometric Synthetic Aperture Radar observations. Journal of Geophysical Research: Solid Earth, 123(10): 9202—9222. doi: 10.1029/2017JB015305 Yu P. F., Qiao X. J., Xiong W., et al., 2020. Source model for the MW 6.0 earthquake in Jiashi, China on 19 January 2020 from Sentinel-1 A InSAR data. Earth, Planets and Space, 72: 169. Zhang Y. , Yang S. M. , Chen H. L. , et al. , 2019. The effect of overburden thickness on deformation mechanisms in the Keping fold-thrust belt, southwestern Chinese Tian Shan Mountains: insights from analogue modeling. Tectonophysics, 753: 79—92. doi: 10.1016/j.tecto.2019.01.005 -
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