| 青海玉树Mw6.9级地震震源破裂过程 |
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| 引用本文： | 王 洵,周 云,孙 蒙,王卫民.青海玉树Mw6.9级地震震源破裂过程[J].地质通报,2014,33(4):517-523. |
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| 作者姓名： | 王 洵 周 云 孙 蒙 王卫民 |
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| 作者单位： | 大陆碰撞与高原隆升重点实验室/中国科学院青藏高原研究所，北京 100101 |
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| 基金项目： | 国家自然科学基金项目(批准号:41174037和41030319) |
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| 摘 要： | 针对2010年青海玉树藏族自治州发生的Mw6.9(Ms7.1)级地震,利用地震波形资料和InSAR获取的同震位移资料,根据同震形成的地表位移干涉图,构建三段式断层模型,反演重建地震的破裂过程。研究显示本次地震断层面走向为119°,倾角79°,滑动角-2.2°,最大滑动量达到200cm,震源深度12.5km,地震标量地震矩为2.18×1026dyn·cm。震源破裂特征表明,玉树地震主要是沿甘孜—玉树断裂发生的左旋走滑破裂事件,反映了印度板块向北的推挤作用下,青藏高原东部不同次级块体东向不均匀挤出的运动学特征。
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| 关 键 词： | 玉树地震 同震位移 破裂过程 InSAR 联合反演 |
Rupture process of the 2010 Mw6.9 Yushu earthquake in Qinghai Province |
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| WANG Xun,ZHOU Yun,SUN Meng,WANG Wei-min.Rupture process of the 2010 Mw6.9 Yushu earthquake in Qinghai Province[J].Geologcal Bulletin OF China,2014,33(4):517-523. |
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| Authors: | WANG Xun ZHOU Yun SUN Meng WANG Wei-min |
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| Institution: | Key Laboratory of Continental Collision and Plateau Uplift/Institute of Tibetan Plateau Research,
Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | On April 14, 2010, an Ms7.1 earthquake struck Yushu County in Qinghai Province. Based on the coseismic surface deformation interferogram, the authors created a three-part style finite-fault model, and reconstructed the source rupture process by utilizing the teleseismic waveform data and local coseismic displacement information obtained by InSAR. The inversion results show that the fault plane of the Yushu earthquake has a strike of 119° and a dip of 79°, with the focal depth being 12.5km, consistent with a moment release of 2.18×1026 dyn·cm. It is characterized mainly by left-lateral strike slip motion along with Yushu-Ganzi fault, indicating the existence of inhomogeneous extrusion of different blocks in eastern Tibetan Plateau. |
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| Keywords: | Yushu earthquake coseismic displacement rupture process InSAR joint inversion |
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