青海玉树Mw6.9级地震震源破裂过程  

Rupture process of the 2010 Mw6.9 Yushu earthquake in Qinghai Province

作　　者：王洵[1] 周云[1] 孙蒙[1] 王卫民[1] 

机构地区：[1]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

出　　处：《地质通报》2014年第4期517-523,共7页Geological Bulletin of China

基　　金：国家自然科学基金项目(批准号:41174037和41030319)

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。On April 14, 2010, an Ms7.1 earthquake struck Yushu County in Qinghai Province. Based on the coseismic surface defor- mation interferogram, the authors created a three-part style finite-fault model, and reconstructed the source rupture process by utiliz- ing 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, indi- cating the existence ofinhomogeneous extrusion of different blocks in eastern Tibetan Plateau.

关 键 词：玉树地震 同震位移 破裂过程 INSAR 联合反演 

分 类 号：P316.33[天文地球—地震学]