| 非均匀应力场下的铲状正断层带位移场和应力场特征 |
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| 引用本文： | 周一杰,胡才博,蔡永恩.非均匀应力场下的铲状正断层带位移场和应力场特征[J].地质论评,2009,55(4):590-597. |
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| 作者姓名： | 周一杰 胡才博 蔡永恩 |
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| 作者单位： | 北京大学地球物理系,北京,100871 |
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| 基金项目： | 本文为国家自然科学基金 (编号 40821062, 40474013) 和地震行业专项基金（编号 200808068）资助项目的成果 |
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| 摘 要： | 本文利用新的有限元方法研究了铲状正断层带在非均匀应力场下错动引起的位移场和应力场。研究发现：① 铲状正断层错动引起的断层面上的最大错距不是发生在地表，而是发生地表下面断层的中部；② 地表面最大水平位移和垂直位移都不是发生在地表断层上，而是发生在偏离断层一定距离的地方；③ 铲状正断层错动会在地表附近产生两个破裂区，一个在地表断层附近，一个在远离断层的上盘地表附近，这两个区与野外观测到的次生正断层区一致；④ 断层错动的应力降在断层内不是均匀的，最大值也是位于断层中部。
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| 关 键 词： | 非均匀应力场 铲状正断层 位移场 应力场 有限元 |
| 收稿时间： | 2008/10/11 0:00:00 |
| 修稿时间： | 2009/3/17 0:00:00 |
Characteristics of Listric Normal Fault Zone's Displacement and Stress Field in the Inhomogeneous Stress Field |
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| ZHOU Yijie,HU Caibo,CAI Yongen.Characteristics of Listric Normal Fault Zone's Displacement and Stress Field in the Inhomogeneous Stress Field[J].Geological Review,2009,55(4):590-597. |
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| Authors: | ZHOU Yijie HU Caibo CAI Yongen |
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| Institution: | ZHOU Yijie,HU Caibo,CAI Yong'en Department of Geophysics,Peking University,Beijing,100871 |
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| Abstract: | A new finite element method (FEM) in consideration of inhomogeneous stress field is introduced to study the dislocation of a listric normal fault zone's displacement and stress fields. New results reveal: (1) the site of maximum slip is at the middle part of the fault, not near the surface. (2) the maximum horizontal and vertical displacements at the ground surface are located at some distance from the fault trace. (3) slip of the fault may result in two failure regions near the ground surface: one close to the surface trace of the fault, and the other within the hanging wall at some distance from the fault; it is in the regions that a succession of normal faults is typically observed in geological examples. 4) The maximum shear stress drop of the fault is also at its middle part. |
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| Keywords: | inhomogeneous stress field listric normal fault displacement field stress field FEM |
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