| 鄂西丹江口水库区域周边断裂构造解析及特征 |
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| 引用本文： | 林松,唐启家,李媛,罗登贵,廖武林,王秋良.鄂西丹江口水库区域周边断裂构造解析及特征[J].地球科学,2017,42(10):1830-1841. |
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| 作者姓名： | 林松 唐启家 李媛 罗登贵 廖武林 王秋良 |
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| 作者单位： | 1.中国地震局地震研究所，湖北武汉 430071 |
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| 基金项目： | 中国地震局社会公益研究项目1521401800062中央高校基本科研业务费专项资金G1323531509国家自然科学基金青年基金项目41404039 |
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| 摘 要： | 鄂西地区位于中国大陆构造演化的关键节点上，地质构造十分复杂，而其中的丹江口水库区域更是我国南水北调工程的核心区域.在此处开展断裂构造研究对于深化南水北调工程的地震安全系统的建设具有重要意义.利用浅层地震反射波勘探技术对丹江口水库周边的3条主要断裂，即丹江、两郧和白河-谷城断裂进行分析，将各断裂内的断层构造进行地震剖面成像，得到了0~300 m深度范围内的断层结构特征.研究结果显示，3条断裂内的断层多为北东走向，丹江和白河-谷城断裂内的断层型态以正断层为主，但两郧断裂以逆断层为主，此特征可能与水库蓄水后，局部应力分布受到影响有关.研究成果不仅刻画出鄂西丹江口地区的断层形态，同时也对将来深入剖析此区域内背景应力及其周边构造单元之间的关系提供了重要的地震学参考资料.
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| 关 键 词： | 丹江口 断裂构造 丹江断裂 两郧断裂 白河-谷城断裂 地震 工程地质 |
| 收稿时间： | 2017-01-02 |
Analysis and Characteristics of Faults around Danjiangkou Reservoir,West Hubei Province |
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| Abstract: | West Hubei Province is located at an important point of the continental structure in China with complex geological structure, of which the Danjiangkou reservoir area is the core area of the South-to-North Water Diversion (SNWD) Project of China. An investigation of fault structure is important for the construction of seismic safety system of the SDWN Project. In this study, a shallow seismic-reflection technology to analyze 0 to 300 m structures of Danjian, Liangyun and Baihe-Gucheng fault zones around the Danjiangkou reservoir is used. The results show that most of fault, striking in the three fault zones are roughly in NE direction. Normal faults largely exist in the Danjiangkou and the Baihe-Gucheng fault zones. In contrast, Liangyun fault zone mainly consists of reverse faults. This fault distribution may be associated with the local stress imposed by the Danjiangkou reservoir. The results not only reveal fault characteristics of the Danjiangkou region but also provide important information of relationship between the background stress in this area and its surrounding tectonic unit for the future studies in seismology. |
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