| 新疆于田MS7.3地震同震与震后形变机制研究 |
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| 引用本文： | 孙赫,季灵运,朱良玉,赵强.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):1052-1055. |
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| 作者姓名： | 孙赫 季灵运 朱良玉 赵强 |
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| 摘 要： | 利用InSAR技术获取2008-03-21新疆于田MS7.3地震的同震和震后形变场。同震分布式滑动反演结果表明，同震断层最大滑动量达5.4 m，主要分布在南部断层的0~5 km深度附近，地震以正断错动为主，兼有左旋走滑分量。震后形变结果表明，发震断层北段两侧存在差异性运动，最大累积差异形变在震后782 d达15 cm。进一步分析表明，震后断层余滑可能是震后形变的主要机制。余滑反演结果表明，震后2 a断层余滑量相对较小，滑移区范围明显减小且均位于浅部区域，北部断层能量释放较彻底，南部仍存有少量能量，整体能量基本释放完。
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| 关 键 词： | 于田地震 InSAR 同震形变场 震后形变场 余滑 |
Coseismic Deformation and Postseismic Deformation Mechanism Yutian MS7.3 Earthquake |
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| SUN He,JI Lingyun,ZHU Liangyu,ZHAO Qiang.Coseismic Deformation and Postseismic Deformation Mechanism Yutian MS7.3 Earthquake[J].Journal of Geodesy and Geodynamics,2016,36(12):1052-1055. |
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| Authors: | SUN He JI Lingyun ZHU Liangyu ZHAO Qiang |
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| Abstract: | On March 21th, 2008, a MS7.3 earthquake occurred in Yutian of Xinjiang. In this paper, InSAR technology is used to obtain the coseismic and postseismic deformation. The inversion of coseismic slip distribution shows that the largest slip achieves 5.4 m and that the slip is dominant in the south of the fault, near 0-5 km depth beneath the ground surface. The earthquake is a normal faulting event with a slight sinistral strike-slip component. Postseismic deformation indicates that there are differences in movement in the north section of seismogenic fault, and the largest cumulative deformation difference is about 15 cm in 782 d after the earthquake. According to the further analysis, the afterslip of postseismic fault may be the main mechanism for deformation. The degree of postseismic afterslip is relatively small in two years and the slip region decreases greatly and for the most part is located in shallow areas. The energy of north fault is relatively exhaustive released, while there is little energy remaining in south part of the fault. |
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| Keywords: | Yutian earthquake InSAR coseismic deformation postseismic deformation afterslip |
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