三峡库首区断裂构造与地震活动特征
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摘要
从地震空间分布、与库水位变化关系以及震源深度特征等方面,探讨三峡库首区地质构造与地震活动的特征。结果表明,地震主要集中分布在巴东的东瀼口、火峰、秭归泄滩、高桥断裂以及仙女山断裂附近。东瀼口、火峰地区岩溶发育,地震多为岩溶塌陷型水库地震;泄滩附近多滑坡和煤矿采空区,属矿塌和浅表卸荷型地震;高桥断裂和仙女山断裂附近的地震则主要与断裂构造相关,属构造型地震。
The tectonic structure and seismicity were analyzed by the space distribution of earthquake,the water level changes and focal depths of seismicity. The result shows that the earthquakes are mainly distributed in the Dongrangkou,Huofeng,Xietan area,and along the Gaoqiao fault and Xiannüshan fault. In the Dongrangkou and Huofeng areas,the earthquakes are mainly caused by Karst collapse. And for the earthquakes in the Xietan area,they are closely related with landslid and coal mine,and the genesis can be contributed to the mine collapse and superficial unloading. Whereas,those earthquakes along the Gaoqiao fault and Xiannüshan fault are mainly caused by the structures.
The tectonic structure and seismicity were analyzed by the space distribution of earthquake,the water level changes and focal depths of seismicity. The result shows that the earthquakes are mainly distributed in the Dongrangkou,Huofeng,Xietan area,and along the Gaoqiao fault and Xiannüshan fault. In the Dongrangkou and Huofeng areas,the earthquakes are mainly caused by Karst collapse. And for the earthquakes in the Xietan area,they are closely related with landslid and coal mine,and the genesis can be contributed to the mine collapse and superficial unloading. Whereas,those earthquakes along the Gaoqiao fault and Xiannüshan fault are mainly caused by the structures.
引文
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2 刘传正.长江三峡库区地质灾害成因与评价研究[M].北京:地质出版社,2007.(Liu Chuanzheng.Research on the geo-hazards genesis and assessment in the Three Gorges reservoir of Yangtze River[M].Beijing:Geological Publishing House,2007)
3 李安然,等.峡东工程地震[M].北京:地震出版社,1996.(Li Anran,et al.Engineering earthquake in the eastern Yangtze Gorges area[M].Beijing:Seismological Press,1996)
4 董建辉.高桥断裂的地震活动性分析[J].大地测量与地球动力学,2004,(2):83-87.(Dong Jianhui.Analysis of seismic activity in Gaoqiao fault[J].Journal of Geodesy and Geodynamics,2004,(2):83-87)
5 夏金梧,等.三峡工程库首区高桥断裂特征与地震活动性研究[J],大地测量与地球动力学,2008,(2):8-16.(Xia Jinwu,et al.Study on characteristics and seismic activity of Gaoqiao fault in the head area of Three Gorges Reservoir[J].Journal of Geodesy and Geodynamics,2008,(2):8-16)
6 陈蜀俊,苏爱军,罗登贵.长江三峡水库诱发地震的成因类型[J].大地测量与地球动力学,2004,(2):70-74.(Chen Shujun,Su Aijun and Luo Denggui.Genesis and type of induced earthquake in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2004,(2):70-74)
7 李细光.三峡库首区活动断层及现今构造应力场研究[D].中国地质大学,2004.(Li Xiguang.Studies on the active faults and the current tectonic stress field in the head area of the Three Gorges reservoir[D].China University of Geosciences,2004)
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