| 2015年塔吉克斯坦MS7.4地震的InSAR观测及其构造意义 |
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| 引用本文： | 李宁,赵强,孙赫.2015年塔吉克斯坦MS7.4地震的InSAR观测及其构造意义[J].大地测量与地球动力学,2018,38(1):43-47. |
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| 作者姓名： | 李宁 赵强 孙赫 |
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| 摘 要： | 利用欧空局提供的Sentinel-1A卫星差分干涉数据为约束，对2015-12-07塔吉克斯坦MS7.4地震的震源机制进行反演。首先运用两轨法对卫星雷达影像进行差分干涉处理，获取覆盖塔吉克斯坦地震震区的同震形变场，然后运用分布式滑动模型反演获取较精细的断层滑动分布。结果显示，分布式滑动模型与观测结果有很高的拟合度。反演结果表明，发震断层以左旋走滑运动为主，此次地震断层的最大滑移量为4.42 m，同震的地震矩为73.71×1018 Nm，矩震级为MW7.19，与震后USGS、GCMT、IPGP等机构给出的震源机制解结果一致，是在具有左旋走滑运动特征的显著构造背景下的一次正常、必然的破裂事件。
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| 关 键 词： | 塔吉克斯坦MS7.4地震 雷达干涉测量 同震形变 滑动分布 位错反演 |
InSAR Observation Results of the 2015 Tajikistan MS7.4 Earthquake and Its Tectonic Significance |
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| LI Ning,ZHAO Qiang,SUN He.InSAR Observation Results of the 2015 Tajikistan MS7.4 Earthquake and Its Tectonic Significance[J].Journal of Geodesy and Geodynamics,2018,38(1):43-47. |
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| Authors: | LI Ning ZHAO Qiang SUN He |
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| Abstract: | In this paper, we use InSAR data from the Sentinel-1A satellite to invert the focal mechanism solutions of the MS7.4 earthquake，which occurred in Tajikistan on 7 December 2015. First,two-pass interferometry technique is utilized to obtain the coseismic deformation of the region, covering the whole epicenter of the Tajikistan earthquake. Second, we utilize the distributed slip model inversion method to obtain a more precise distribution of fault slip by means of down-sampling the original observation data. The results indicates that inversion results are consistent with the observation data. In addition, the inversion results show that the seismogenic fault is dominated by sinistral strike-slip movement. The maximum slip of the earthquake fault is 4.42 m, and the coseismic seismic moment is about 73.71×1018 Nm (MW7.19), which is consistent with the seismic research results available from USGS, GCMT, IPGP after this event. It also shows that this earthquake is a normal and inevitable rupture event in the significant tectonic setting with left-lateral strike-slip motion. |
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| Keywords: | Tajikistan MS7 4 earthquake radar interferometry coseismic deformation slip distribution dislocation inversion |
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