汶川地震前川滇地区断裂活动特征分析
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摘要
利用川滇地区32处跨断层位移流动短水准、短基线20余年的观测资料,对该区主要活动构造在汶川地震前的活动特征进行了分析,结果表明:20世纪80年代以来主要活动构造多数呈继承性活动;汶川地震前,区域应力在2006年以来出现了持续2年左右的增强;鲜水河断裂带中南段、龙门山断裂带中南段受较强的北西-南东方向的压应力作用。
Utilizing the mobile cross-fault short-line leveling and short-baseline measurement data for over 20 years at 32 sites in Sichuan-Yunnan area,we made a preliminary analysis of the contemporary activities and the activity characteristics of the major active faults in this area before the Wenchuan earthquake.The result indicates that since the 1980s the major active faults in this area mostly have showed successional movement and the regional stress in Sichuan-Yunnan area increased persistently for two years after 2006 before the Wenchuan earthquake,besides,the relatively strong compressional stress toward NW-SE appeared in the mid-south segment of Xianshuihe fault belt and the mid-south segment of Longmenshan fault belt.
Utilizing the mobile cross-fault short-line leveling and short-baseline measurement data for over 20 years at 32 sites in Sichuan-Yunnan area,we made a preliminary analysis of the contemporary activities and the activity characteristics of the major active faults in this area before the Wenchuan earthquake.The result indicates that since the 1980s the major active faults in this area mostly have showed successional movement and the regional stress in Sichuan-Yunnan area increased persistently for two years after 2006 before the Wenchuan earthquake,besides,the relatively strong compressional stress toward NW-SE appeared in the mid-south segment of Xianshuihe fault belt and the mid-south segment of Longmenshan fault belt.
引文
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2滕吉文,等.2008汶川Ms8.0地震发生的深层过程和动力学响应[J].地球物理学报,2008,51(5):1385-1402.2Teng Jiwen,et al.Deep processes and dynamic responses associated with the WenchuanMs8.0earthquake of2008[J].Chinese J.Geophys.2008,51(5):1385-1402.(in Chinese)
3王卫民,等.四川汶川8.0级地震震源过程[J].地球物理学报,2008,51(5):1403-1410.3Wang Weimin,et al.Rupture process of theMs8.0Wen-chuan earthquake of Sichuan,China[J].Chinese J.Geo-phys,2008,51(5):1403-1410.(in Chinese)
4徐锡伟,闻学泽,郑荣章.川滇地区活动块体最新构造变动样式及其动力来源[J]中国科学,D辑,2003,33(增刊):151-161.4Xu Xiwei,Wen Xueze and Zheng Rongzhang.Recent tec-tonic variation pattern of active blocks in Sichuan-Yunnan ar-ea and its dynamic source[J].Sciences in China(Series D),2003,33(Sup.),151-161.(in Chinese)
5丁国瑜.中国岩石圈动力学概论[M].北京:地震出版社,1991.5Ding Guoyu.An introduction to lithosphere dynamics of Chi-na[M].Beijing:Seismological Press,1991.(in Chinese)
6唐文清,等.龙门山断裂构造带GPS研究[J].大地测量与地球动力学,2004,24(3):57-59.6Tang Wenqing,et al.GPS study on Longmenshan fault zone[J].Journal of Geodesy and Geodynamics,2004,24(3):57-59.(in Chinese)
7虢顺民,等.红河活动断裂带[M].北京:地震出版社,2001.7Guo Shunmin,et al.Honghe active fault belt[M].Bei-jing:Seismological Press,2001.(in Chinese)
8宋方敏,等.小江活动断裂带[M].北京:地震出版社,1998.8Song Fangmin,et al.Xiaojiang active fault belt[M].Bei-jing:Seismological Press,1998.(in Chinese)
9国家地震局地质研究所.中国活断层研究专集.滇西北地区活动断裂[M].北京:地震出版社,1990.9Institute of Geology,State Seismological Bureau.Monograph of active faults in China.Active faults in northwestern Yun-nan[M].Beijing:Seismological Press,1990.(in Chi-nese)
10焦青,等.汶川8.0级地震前后龙门山断裂活动特征浅析[J].大地测量与地球动力学,2008,28(4):7-11.10Jiao Qing,et al.A preliminary study of motion characteris-tics of Longmenshan fault before and afterMs8.0Wen-chuan earthquake[J].Journal of Geodesy and Geodynam-ics,2008,28(4):7-11.(in Chinese)
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