首页 | 本学科首页   官方微博 | 高级检索  
     检索      

四川汶川8.0级地震震源过程
引用本文:王卫民,赵连锋,李娟,姚振兴.四川汶川8.0级地震震源过程[J].地球物理学报,2008,51(5):1403-1410.
作者姓名:王卫民  赵连锋  李娟  姚振兴
作者单位:1.中国科学院青藏高原研究所,北京 100085;2.中国科学院地质与地球物理研究所,北京 100029
基金项目:国家重点基础研究发展计划(973计划),国家自然科学基金,中国科学院西部之光人才计划
摘    要:2008年5月12日在青藏高原与四川盆地交界的龙门山山脉发生了Ms8.0级强烈地震,引发山体滑坡等地质灾害,造成了巨大的人员伤亡和经济损失.本文利用远场体波波形记录结合近场同震位移数据,根据地质资料和地震形成的地表破裂轨迹,构造了一个双“铲状”有限地震断层模型,利用反演技术重建地震的破裂过程.结果显示汶川大地震主要是沿龙门山构造带的映秀-北川断裂和灌县-江油断裂发生的逆冲兼右旋走滑破裂事件.断层面上的滑动分布显示两个高滑动区先后发生在地震破坏最为严重的映秀和北川地区,最大滑动量高达1200~1250 cm,且破裂过程也显示一定的复杂性.地震破裂的平均走滑量略大于平均倾滑量,与多种观测资料获得的震前龙门山断裂带构造变形相一致,推断是由于长期区域应力场作用和龙门山地区特殊的物质组成和结构孕育了这次千年尺度的强烈地震.

关 键 词:  汶川地震" target="_blank">face="Verdana">汶川地震  震源过程  有限断层模型  同震位移  波形反演  
收稿时间:2008-8-22
修稿时间:2008-8-26

Rupture process of the M, 8.0 Wenchuan earthquake of Sichuan,China
WANG Wei-Min,ZHAO Lian-Feng,LI Juan,YAO Zhen-Xing.Rupture process of the M, 8.0 Wenchuan earthquake of Sichuan,China[J].Chinese Journal of Geophysics,2008,51(5):1403-1410.
Authors:WANG Wei-Min  ZHAO Lian-Feng  LI Juan  YAO Zhen-Xing
Institution:1.Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;2.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract:On 12 May,2008 the great Wenchuan earthquake with magnitude Ms8.0 occurs on the Longmen Shan belt,which is located at the eastern margin of the Tibetan Plateau and northwestern Sichuan region of China.The strong shaking of the Wenchuan earthquake causes great disasters to life and property,and severe geologic damages,e.g.landslides and cracks to dams are inflicted.Based on the geologic studies and the surface rupture investigation,we constructed a more realistic double-listric finite-fault model,and reconstructed the source rupture process by combined inverting the teleseismic waveforms and local coseismic displacement.Results show that the Wenchuan earthquake is characterized mainly by thrust motion with right-lateral strike slip also,and two faults-Yingxiu-Beichuan fault and Guanxian-Jiangyou fault participated simultaneously during the rupture process.The estimated maximum slip on the fault can reach up to 12~12.5 m,and the distribution of slip on the faults with high magnitude can be projected to Yingxiu and Beichuan county which are severely damaged.The average strike-slip motion is a little larger than the slip motion,which is coincident with the deformation observation along the Longmen Shan tectonic region.The long-time regional stress accumulation,the composition of this region and special tectonic structure might be the reason for this great Wenchuan earthquake with recurrence interval of thousand years.
Keywords:Wenchuan earthquake  Source process  Finite-fault model  Coseismic displacement  Waveform inversion
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《地球物理学报》浏览原始摘要信息
点击此处可从《地球物理学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号