三峡水库泄滩西地区地震双差定位及成因分析
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摘要
利用三峡流动观测台网的地震记录,采用双差定位法对三峡水库泄滩西的136个地震进行了重新定位。重新定位后,地震在E-W、N-S和U-D 3个方向的均方根偏移分别为0.38、0.33和0.98km。定位结果表明:水库北岸碎屑岩区地震震源深度4～5km,地震从浅到深呈线性分布,为断层破裂型水库诱发地震;水库南岸灰岩区地震震源深度2～3km,地震略呈发散分布,具有岩溶塌陷型水库诱发地震的特点。
136 earthquakes,taking place in the west of Xietan area,recorded by portable stations deployed in the Three Georges reservoir area were relocated using the double difference algorithm.The relocations show that the root-mean-square shifts of the relocations in the directions of E-W,N-S and U-D are 0.38km,0.33km and 0.98km,respectively.The earthquakes in clasolite area with the focal depths about 4～5km take on linear distributions from shallow to deep part.These earthquakes were deduced as reservoir induced earthquake of fault fracture type.In the contrast,the earthquakes in limestone pavement with the focal depths about 2～3km take on slightly divergent distribution and have the characters of reservoir induced earthquake of the karts collapse type.
136 earthquakes,taking place in the west of Xietan area,recorded by portable stations deployed in the Three Georges reservoir area were relocated using the double difference algorithm.The relocations show that the root-mean-square shifts of the relocations in the directions of E-W,N-S and U-D are 0.38km,0.33km and 0.98km,respectively.The earthquakes in clasolite area with the focal depths about 4～5km take on linear distributions from shallow to deep part.These earthquakes were deduced as reservoir induced earthquake of fault fracture type.In the contrast,the earthquakes in limestone pavement with the focal depths about 2～3km take on slightly divergent distribution and have the characters of reservoir induced earthquake of the karts collapse type.
引文
①胡毓良等,1990,长江三峡工程水库诱发地震的研究,国家重点科技攻关项目专题研究成果报告。
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韩晓光,饶扬誉.2004.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,24(2):74—77.HAN Xiao-guang,RAO Yang-yu.2004.Analysis of genesis of reservoir-induced microquakes in Badong reach of theThree Gorges[J].Journal of Geodesy and Geodynamics,24(2):74—77(in Chinese).
胡毓良,杨清源,陈献程.1998.长江三峡工程周边地区的采矿诱发地震[J].地震地质,20(4):349—360.HUYu-liang,YANG Qing-yuan,CHEN Xian-cheng.1998.Mining-induced earthquakes in the area around the YangtzeThree-Gorge Project[J].Seismology and Geology,20(4):349—360(in Chinese).
李胜乐,严尊国,薛军蓉,等.2003.长江三峡水库蓄水后的首发微震群活动[J].大地测量与地球动力学,23(4):75—79.LI Sheng-le,YAN Zun-guo,XUE Jun-rong,et al.2003.First microquake swarm activity since storage in Three Gorgesreservoir[J].Journal of Geodesy and Geodynamics,23(4):75—79(in Chinese).
廖武林,张丽芬,姚运生.2009.三峡水库地震活动特征研究[J].地震地质,31(4):707—714.LIAO Wu-lin,ZHANG Li-fen,YAO Yun-sheng.2009.Characteristics of seismicity in the Three Gorges reservoir area[J].Seismology and Geology,31(4):707—714(in Chinese).
张爱民,李强.2006.双差定位法在三峡库区地震定位中的应用[J].大地测量与地球动力学,26(3):73—77.ZHANG Ai-min,LI Qiang.2006.Application of double-difference location method to earthquakes in Three Gorges reser-voir area[J].Journal of Geodesy and Geodynamics,26(3):73—77(in Chinese).
赵旭,李强,蔡晋安,等.2007.三峡库首区最小一维速度模型研究[J].大地测量与地球动力学,27(专刊):1—7.ZHAO Xu,LI Qiang,CAI Jin-an,et al.2007.On minimum1D velocity model applied in Three Gorges area[J].Journalof Geodesy and Geodynamics,27(Special):1—7(in Chinese).
Waldhauser F,Ellsworth W L.2000.A double-difference earthquake location algorithm:Method and application to theNorthern Hayward Fault,California[J].Bull Seism Soc Am,90(6):1353—1368.
陈蜀俊,苏爱军,罗登贵.2004.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,24(2):70—73.CHEN Shu-jun,SU Ai-jun,LUO Deng-gui.2004.Genesis and type of induced earthquake in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,24(2):70—73(in Chinese).
韩晓光,饶扬誉.2004.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,24(2):74—77.HAN Xiao-guang,RAO Yang-yu.2004.Analysis of genesis of reservoir-induced microquakes in Badong reach of theThree Gorges[J].Journal of Geodesy and Geodynamics,24(2):74—77(in Chinese).
胡毓良,杨清源,陈献程.1998.长江三峡工程周边地区的采矿诱发地震[J].地震地质,20(4):349—360.HUYu-liang,YANG Qing-yuan,CHEN Xian-cheng.1998.Mining-induced earthquakes in the area around the YangtzeThree-Gorge Project[J].Seismology and Geology,20(4):349—360(in Chinese).
李胜乐,严尊国,薛军蓉,等.2003.长江三峡水库蓄水后的首发微震群活动[J].大地测量与地球动力学,23(4):75—79.LI Sheng-le,YAN Zun-guo,XUE Jun-rong,et al.2003.First microquake swarm activity since storage in Three Gorgesreservoir[J].Journal of Geodesy and Geodynamics,23(4):75—79(in Chinese).
廖武林,张丽芬,姚运生.2009.三峡水库地震活动特征研究[J].地震地质,31(4):707—714.LIAO Wu-lin,ZHANG Li-fen,YAO Yun-sheng.2009.Characteristics of seismicity in the Three Gorges reservoir area[J].Seismology and Geology,31(4):707—714(in Chinese).
张爱民,李强.2006.双差定位法在三峡库区地震定位中的应用[J].大地测量与地球动力学,26(3):73—77.ZHANG Ai-min,LI Qiang.2006.Application of double-difference location method to earthquakes in Three Gorges reser-voir area[J].Journal of Geodesy and Geodynamics,26(3):73—77(in Chinese).
赵旭,李强,蔡晋安,等.2007.三峡库首区最小一维速度模型研究[J].大地测量与地球动力学,27(专刊):1—7.ZHAO Xu,LI Qiang,CAI Jin-an,et al.2007.On minimum1D velocity model applied in Three Gorges area[J].Journalof Geodesy and Geodynamics,27(Special):1—7(in Chinese).
Waldhauser F,Ellsworth W L.2000.A double-difference earthquake location algorithm:Method and application to theNorthern Hayward Fault,California[J].Bull Seism Soc Am,90(6):1353—1368.
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