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地震

地震 ›› 2014, Vol. 34 ›› Issue (1): 58-67.

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汶川8.0级地震前龙门山断裂带孕震构造运动特征分析

平建军1, 江在森2, 冯向东1, 平彩鹏1, 单连君1, 王夏3   

  1. 1.河北省地震局, 河北 石家庄 050021;
    2.中国地震局地震预测研究所, 北京 100036;
    3.邢台市地震局, 河北 邢台 054001
  • 发布日期:2020-07-20
  • 作者简介:平建军(1962-), 男, 河北高邑人, 正研级高级工程师, 主要从事地震综合预测与研究工作。
  • 基金资助:
    “十一五”国家科技支撑计划子专题(2006BAC01B02-02-02)资助

Seismotectonic Movement Characteristics of the Longmenshan Fault Zone before the Wenchuan 8.0 Earthquake

PING Jian-jun1, JIANG Zai-sen2, FENG Xiang-dong1, PING Cai-peng1, SHAN Lian-jun1, WANG Xia3   

  1. 1. Earthquake Administration of Hebei Province, Shijiazhuang 050022, China;
    2. Institute of Earthquake Science, CEA, Beijing 10036, China;
    3. Earthquake Administration of Xingtai, Hebei, Xingtai 054001, China
  • Published:2020-07-20

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摘要： 根据弹性回跳理论，利用1999至2007年相对中国大陆的三期GPS水平运动速度场资料，着重对每一期跨龙门山断裂带的GPS站点运动速度，在平行龙门山断裂带上的投影速度进行计算，在此基础上，以图示和幂函数拟合方式，分析了龙门山断裂带两侧地面相对运动变形情况。结果显示: 汶川8.0级地震前龙门山断裂带两侧地面相对运动出现了右旋剪切运动，且这种右旋剪切运动受阻于龙门山断裂带。这对于识别判定孕震弹性应变能积累变形异常，进而开展地震预测与研究具有积极意义。

关键词: 龙门山断裂带, GPS, 右旋剪切, 弹性应变, 汶川8.0级地震

Abstract: On the basis of elastic rebound theory, using horizontal velocity field of mainland China calculated from GPS data during three observation periods from 1999 to 2007, velocity components that parallel with and plumb to the fault zone are calculated respectively in different period, and then relative ground movements of two sides of the fault zone are analysed with power function fitting and graphics. The results show that, the relative ground movement shows right-lateral shear deformation before the Wenchuan 8. 0 earthquake. At the same time, the movement had been locked at the Longmenshan fault zone. So the results have a positive significance for distinguishing elastic strain energy accumulation and deformation anomaly of earthquake preparation, and for further research on earthquake prediction.

Key words: Seismotectonics, GPS, Elastic strain, Longmenshan fault zone, The Wenchuan 8. 0 earthquake

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