| 汶川8.0级地震构造动力成因分析 |
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| 引用本文： | 张国民,邵志刚,刘桂萍,马宏生.汶川8.0级地震构造动力成因分析[J].地震,2009,29(1). |
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| 作者姓名： | 张国民 邵志刚 刘桂萍 马宏生 |
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| 作者单位： | 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 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务专项经费资助项目 |
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| 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.
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| 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 |
Analysis on the Geodynamic Cause of the Wenchuan 8.0 Earthquake |
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| ZHANG Guo-min,SHAO Zhi-gang,LIU Gui-ping,MA Hong-sheng.Analysis on the Geodynamic Cause of the Wenchuan 8.0 Earthquake[J].Earthquake,2009,29(1). |
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| Authors: | ZHANG Guo-min SHAO Zhi-gang LIU Gui-ping MA Hong-sheng |
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| Institution: | 1.Institute of earthquake Science;CEA Beijing 100036;China;2.CEA;Beijing 100036;China |
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| 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 progre... |
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| Keywords: | Wenchuan 8 0 earthquake Geodynamic cause Seismogenic model |
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