| 三峡库首区重点断裂围限区蓄水的加卸载效应 |
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| 引用本文： | 陈蜀俊,姚运生,蔡永建.三峡库首区重点断裂围限区蓄水的加卸载效应[J].大地测量与地球动力学,2006,26(4):97-101. |
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| 作者姓名： | 陈蜀俊 姚运生 蔡永建 |
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| 作者单位： | 1. 中国地震局地震研究所,武汉,430071;武汉地震工程研究院,武汉,430071
2. 中国地震局地震研究所,武汉,430071 |
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| 基金项目： | 科技部公益研究专项(2004DIB3J131) |
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| 摘 要： | 通过对蓄水前后三峡库首区构造应力场进行三维数值模拟发现,相对于蓄水前,蓄水至135 m水位时,官渡口断裂-马鹿池断裂-牛口断裂围限区、秭归地理中心和九湾溪断裂带,出现了4个主应力下降区和共轭的主应力增长区,形成了差应力场;175 m水位与135 m水位相比,局部差应力场呈现逆向变化,即形成了加载效应与卸载效应的交替过程。这一过程,可能是水库诱发地震的诱震(或触震)因素。
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| 关 键 词： | 三峡库首区 断裂围限区 加载效应 卸载效应 二次诱发地震 |
| 文章编号： | 1671-5942(2006)04-0097-05 |
| 修稿时间： | 2006年8月5日 |
LOADING AND UNLOADING EFFECT OF THREE GORGES RESERVOIR IMPOUNDING ON AREA DEFINED BY MAIN FAULTS OF HEAD AREA |
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| Chen Shujun,Yao Yunsheng,Cai Yongjian.LOADING AND UNLOADING EFFECT OF THREE GORGES RESERVOIR IMPOUNDING ON AREA DEFINED BY MAIN FAULTS OF HEAD AREA[J].Journal of Geodesy and Geodynamics,2006,26(4):97-101. |
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| Authors: | Chen Shujun Yao Yunsheng Cai Yongjian |
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| Abstract: | The tectonic stress field in the head area of the Three Gorges before and after reservoir impounding was simulated 3D numerically,the results show that in waterlevel 135 m,compared with before impounding, four principal stress-dropping and conjugate principal stress-raising regions appear in the area defined by Guandukou fault-Maluchi fault-Niukou fault, Zhigui county and Jiuwanxi fault zone and forms the differential stress field.In water level of 175 m compared with 135 m,the local differential stress changes reversely and the loading and unloading effects appear alternately.This process perhaps is the main reason of induced reservoir earthquake. |
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| Keywords: | head area of the Three Gorges area defined by faults loading effect unloading effect secondary induced earthquake |
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