基于升降轨Sentinel-1 SAR影像研究精河M_S6.6地震震源机制
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摘要
采用Sentinel-1A/B卫星升降轨SAR数据获取了2017-08-09新疆精河MS6.6地震的同震形变场,并以InSAR形变场为约束,利用均匀滑动模型和分布式滑动模型反演了发震断层的滑动分布。结果表明,升降轨InSAR形变场均显示为隆升,形变影响范围约30km×40km;发震断层走向约为83.8°,倾角约为40.6°,滑动角约为89.1°,震源深度约为20.7km,矩震级为MW6.35,同震位错以逆冲运动为主兼有极少量左旋走滑分量。精河地震的发震断层为库松木楔克山前断裂,该次地震是新疆北天山地区逆冲断裂带深部发生错动的结果。
On 9 th August,2017,an MS6.6 earthquake occurred in Jinghe county of Xinjiang,China.In this study,ascending and descending tracks of Sentinel-1 A/B images are employed to derive the precise coseismic surface displacements,then a two-step inversion strategy with uniform slip model and distributed slip model is used to estimate the fault geometry and coseismic slip distribution.InSAR results show that the coseismic deformation range is about 30 km×40 km.Our model suggests that the distributed slip mode can fit the observations very well.The earthquake fault is a thrust fault with a strike of 83.8°,a dip of 40.6°,a rake of 89.1°,a focal depth of 20.7 km,and the moment magnitude is 6.3,which is consistent with seismological results.The causative fault of Jinghe earthquake is Kusongmuxieke mountain front fault,and this earthquake is caused by the dislocation at the deep of thrust fault zone in the northern Tianshan mountains,Xinjiang.
On 9 th August,2017,an MS6.6 earthquake occurred in Jinghe county of Xinjiang,China.In this study,ascending and descending tracks of Sentinel-1 A/B images are employed to derive the precise coseismic surface displacements,then a two-step inversion strategy with uniform slip model and distributed slip model is used to estimate the fault geometry and coseismic slip distribution.InSAR results show that the coseismic deformation range is about 30 km×40 km.Our model suggests that the distributed slip mode can fit the observations very well.The earthquake fault is a thrust fault with a strike of 83.8°,a dip of 40.6°,a rake of 89.1°,a focal depth of 20.7 km,and the moment magnitude is 6.3,which is consistent with seismological results.The causative fault of Jinghe earthquake is Kusongmuxieke mountain front fault,and this earthquake is caused by the dislocation at the deep of thrust fault zone in the northern Tianshan mountains,Xinjiang.
引文
[1]李金,周龙泉,龙海英,等.天山地震带(中国境内)震源机制一致性参数的时空特征[J].地震地质,2015,37(3):792-803(Li Jin,Zhou Longquan,Long Haiying,et al.Spatial-Temporal Characteristics of the Focal Mechanism Consistency Parameter in Tianshan(within Chinese Territory)Seismic Zone[J].Seismology and Geology,2015,37(3):792-803)
[2]陈建波,沈军,李军,等.北天山西段库松木楔克山山前断层新活动特征初探[J].地震工程学报,2007,29(4):335-340(Chen Jianbo,Shen Jun,Li Jun,et al.Preliminary Study on New Active Characteristics of Kusongmuxieke Mountain front Fault in the West Segment of North Tianshan[J].Northwestern Seismological Journal,2007,29(4):335-340)
[3]邓起东.活动断裂研究[M].北京:地震出版社,1991(Deng Qidong.Research of Active Faults[M].Beijing:Seismological Press,1991)
[4]陈建波,谭明,吴国栋,等.2011年10月16日新疆精河县5.0级地震震害特征及原因[J].震灾防御技术,2012,7(2):532-542(Chen Jianbo,Tan Ming,Wu Guodong,et al.The Seismic Damage Characteristic and the Cause of the Jinhe M5.0Earthquake in Xinjiang on Oct.16,2011[J].Technology for Earthquake Disaster Prevention,2012,7(2):532-542)
[5]季灵运,刘立炜,郝明.利用InSAR技术研究滇西南镇康-永德地区现今地壳形变特征[J].地震研究,2015,38(1):84-89(Ji Lingyun,Liu Liwei,Hao Ming.Crustal Deformation Characteristic of Zhenkang-Yongde Region in Southwest Yunnan Observed by InSAR Technology[J].Journal of Seismological Research,2015,38(1):84-89)
[6]孙赫,季灵运,朱良玉,等.新疆于田MS7.3地震同震与震后形变机制研究[J].大地测量与地球动力学,2016,36(12):1 052-1 055(Sun He,Ji Lingyun,Zhu Liangyu,et al.Coseismic Deformation and Postseismic Deformation Mechanism Yutian MS7.3Earthquake[J].Journal of Geodesy and Geodynamics,2016,36(12):1 052-1 055)
[7] Okada Y.Surface Deformation due to Shear and Tensile Faults in a Half-Space[J].Bulletin of the Seismological Society of America,1985,92(2):1 018-1 040
[8] Ji L,Xu J,Zhao Q,et al.Source Parameters of the 2003-2004Bange Earthquake Sequence,Central Tibet,China,Estimated from InSAR Data[J].Remote Sensing,2016,8(6):516
[9] Press W H,Teukolsky S A,Flannery B P,et al.Numerical Recipes in C:The Art of Scientific Computing[M].Cambridge:Cambridge University Press,1992
[10]Wang R,Diao F,Hoechner A.SDM-A Geodetic Inversion Code Incorporating with Layered Crust Structure and Curved Fault Geometry[C].EGU General Assembly Conference,2013
[11]Wang R,Parolai S,Ge M,et al.The 2011 MW 9.0Tohoku Earthquake:Comparison of GPS and Strong-Motion Data[J].Bulletin of the Seismological Society of America,2013,103(2B):1 336-1 347
[12]张培震,邓起东,徐锡伟,等.盲断裂、褶皱地震与新疆1906年玛纳斯地震[J].地震地质,1994(3):193-204(Zhang Peizhen,Deng Qidong,Xu Xiwei,et al.Blind Thrust,Folding Earthquake,and the 1906Manas Earthquake,Xinjiang[J].Seismology and Geology,1994(3):193-204)
[2]陈建波,沈军,李军,等.北天山西段库松木楔克山山前断层新活动特征初探[J].地震工程学报,2007,29(4):335-340(Chen Jianbo,Shen Jun,Li Jun,et al.Preliminary Study on New Active Characteristics of Kusongmuxieke Mountain front Fault in the West Segment of North Tianshan[J].Northwestern Seismological Journal,2007,29(4):335-340)
[3]邓起东.活动断裂研究[M].北京:地震出版社,1991(Deng Qidong.Research of Active Faults[M].Beijing:Seismological Press,1991)
[4]陈建波,谭明,吴国栋,等.2011年10月16日新疆精河县5.0级地震震害特征及原因[J].震灾防御技术,2012,7(2):532-542(Chen Jianbo,Tan Ming,Wu Guodong,et al.The Seismic Damage Characteristic and the Cause of the Jinhe M5.0Earthquake in Xinjiang on Oct.16,2011[J].Technology for Earthquake Disaster Prevention,2012,7(2):532-542)
[5]季灵运,刘立炜,郝明.利用InSAR技术研究滇西南镇康-永德地区现今地壳形变特征[J].地震研究,2015,38(1):84-89(Ji Lingyun,Liu Liwei,Hao Ming.Crustal Deformation Characteristic of Zhenkang-Yongde Region in Southwest Yunnan Observed by InSAR Technology[J].Journal of Seismological Research,2015,38(1):84-89)
[6]孙赫,季灵运,朱良玉,等.新疆于田MS7.3地震同震与震后形变机制研究[J].大地测量与地球动力学,2016,36(12):1 052-1 055(Sun He,Ji Lingyun,Zhu Liangyu,et al.Coseismic Deformation and Postseismic Deformation Mechanism Yutian MS7.3Earthquake[J].Journal of Geodesy and Geodynamics,2016,36(12):1 052-1 055)
[7] Okada Y.Surface Deformation due to Shear and Tensile Faults in a Half-Space[J].Bulletin of the Seismological Society of America,1985,92(2):1 018-1 040
[8] Ji L,Xu J,Zhao Q,et al.Source Parameters of the 2003-2004Bange Earthquake Sequence,Central Tibet,China,Estimated from InSAR Data[J].Remote Sensing,2016,8(6):516
[9] Press W H,Teukolsky S A,Flannery B P,et al.Numerical Recipes in C:The Art of Scientific Computing[M].Cambridge:Cambridge University Press,1992
[10]Wang R,Diao F,Hoechner A.SDM-A Geodetic Inversion Code Incorporating with Layered Crust Structure and Curved Fault Geometry[C].EGU General Assembly Conference,2013
[11]Wang R,Parolai S,Ge M,et al.The 2011 MW 9.0Tohoku Earthquake:Comparison of GPS and Strong-Motion Data[J].Bulletin of the Seismological Society of America,2013,103(2B):1 336-1 347
[12]张培震,邓起东,徐锡伟,等.盲断裂、褶皱地震与新疆1906年玛纳斯地震[J].地震地质,1994(3):193-204(Zhang Peizhen,Deng Qidong,Xu Xiwei,et al.Blind Thrust,Folding Earthquake,and the 1906Manas Earthquake,Xinjiang[J].Seismology and Geology,1994(3):193-204)