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地震 ›› 2009, Vol. 29 ›› Issue (1): 164-173.

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汶川8.0级地震构造动力成因分析

张国民1, 邵志刚1, 刘桂萍2, 马宏生1   

  1. 1.中国地震局地震预测研究所, 北京 100036;
    2.中国地震局, 北京 100036
  • 收稿日期:2008-10-27 修回日期:2008-11-10 出版日期:2009-01-31 发布日期:2021-10-15
  • 作者简介:张国民(1942-), 男, 上海市人, 研究员, 博士生导师, 主要从事大陆强震机理与预测等研究。
  • 基金资助:
    中国地震局地震预测研究所基本科研业务专项(02076902-11)

Analysis on the Geodynamic Cause of the Wenchuan 8.0 Earthquake

ZHANG Guo-min1, SHAO Zhi-gang1, LIU Gui-ping2, MA Hong-sheng1   

  1. 1. Institute of earthquake Science, CEA Beijing 100036, China;
    2. CEA, Beijing 100036, China
  • Received:2008-10-27 Revised:2008-11-10 Online:2009-01-31 Published:2021-10-15

摘要: 汶川8.0级地震发生在青藏活动地块区的东部边界带, 是继2001年昆仑山口西大地震之后青藏块区的又一次巨大地震。 根据龙门山推覆逆冲断裂带深浅部构造背景和壳幔结构特征, 文中构建了汶川地震的震源简化模型。 并依据震源模型的力学抽象建立了孕震过程的动力学方程组, 且在简化解释下给出了孕震过程中的应力、 应变的解析表达式。 应用模型的解析解, 并参照龙门山构造区的构造形变观测结果, 初步讨论了汶川地震的孕震过程, 给出了汶川8.0级地震的孕育过程可达3000多年的结果, 指出由于龙门山地区构造形变速率很低, 因而导致孕震过程缓慢, 大震复发期较长的基本结果。

关键词: 汶川8.0级地震, 构造动力成因, 孕震模型, 龙门山断裂

Abstract: The 2008 Wenchuan 8.0 earthquake occurred on the eastern boundary of the active Tibet block, and is another strong earthquake in the Tibet block after the 2001 Kunlun 8.1 earthquake. Based on the characters of the structure of crust and mantle and the deep or shallow geological background in the Longmenshan dip fault, this paper constructs a simplified source model of the Wenchuan earthquake, from which dynamic equations from this model are constructed and analytic expressions of stress and strain in the progress of seismogeny are derived. Referring to the geological deformation in the Longmenshan region, we further discuss the process of the Wenchuan earthquake by the analytic solution of the model. The result shows that the process of seismogeny may endure about 3200 years and is very slow and longer because of the lower geological deformation in the Longmenshan region.

Key words: Wenchuan 8.0 earthquake, Geodynamic cause, Seismogenic model

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