福建水口库区地震活动及其动力成因分析
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摘要
根据水库蓄水后地震活动的时间分布特征,将水库诱发地震分为三个阶段,通过对三个阶段地震活动的震中分布、震源深度、震源机制解等活动特征进行分析,同时考证震中区历史上曾发生过的强烈有感地震,得出以下认识:①库区三个阶段地震动力成因各不相同,第一阶段主要是水库蓄水引发的初始应力释放,第二阶段地震动力来自东南方向,第三阶段地震动力来自西北方向。②水库诱发地震震中区历史上曾发生过强烈有感地震,震中区将成为区域构造应力场调整释放的"窗口",因此应加强水口库区的地震监测与防御。③在讨论福建地区地震动力成因时,不能只强调来自台湾岛弧碰撞对福建地区地震的控制作用,而忽略来自喜马拉雅碰撞带对福建地区的作用力。
According to the temporal distribution feature of seismicity after reservoir basin impoundment,this paper divides reservoir-induced earthquakes into three stages.Based on analysis on the seismicity characteristics of three stages which include epicentral distribution,focal depth,focal mechanism solution and investigation on the intense and sensible earthquakes that happened in history epicentral area,some conclusions are drawn : 1) At the three stages,the origin of seismic dynamics in reservoir area differes from one another.The main cause of first stage is the original stress release initiated by reservoir filling;seismic dynamic of second stage is from southeast,and the third's is from northwest.2) The reservoir-induced intense and sensible earthquake had been happened in history in the epicenter of seismicity area has ever happened.The epicenter will become an adjusting and releasing window for regional tectonic stress field,so it is needed to enhance seismic monitoring and defense of Shuikou(river outlet) reservoir.3) When discussing the seismic dynamic origin in Fujian region,we can not only emphasize that Taiwan island arc collision has a constraining power to Fujian region,but ignored the applied force to Fujian region which is from Himalayan convergence belt.
According to the temporal distribution feature of seismicity after reservoir basin impoundment,this paper divides reservoir-induced earthquakes into three stages.Based on analysis on the seismicity characteristics of three stages which include epicentral distribution,focal depth,focal mechanism solution and investigation on the intense and sensible earthquakes that happened in history epicentral area,some conclusions are drawn : 1) At the three stages,the origin of seismic dynamics in reservoir area differes from one another.The main cause of first stage is the original stress release initiated by reservoir filling;seismic dynamic of second stage is from southeast,and the third's is from northwest.2) The reservoir-induced intense and sensible earthquake had been happened in history in the epicenter of seismicity area has ever happened.The epicenter will become an adjusting and releasing window for regional tectonic stress field,so it is needed to enhance seismic monitoring and defense of Shuikou(river outlet) reservoir.3) When discussing the seismic dynamic origin in Fujian region,we can not only emphasize that Taiwan island arc collision has a constraining power to Fujian region,but ignored the applied force to Fujian region which is from Himalayan convergence belt.
引文
①福建地震地质工程勘察院,福建闽江水口水电站枢纽坝下水位治理工程场地地震安全性评价报告,2009年.
①福建省地震历史资料组.福建省地震历史资料汇编.1979.
①福建省地震历史资料组.福建省地震历史资料汇编.1979.
②丁原章.福建水口水库诱发地震研讨会上的讲话,福州,1997.
[1]彭美凤、林世敏、林松建.水口水库地震及其活动特征[J].华南地震,1997,17(2):83-89.
[2]郑小菁,林颐耀,李华.水口库区水位与地震活动的关系[J].地壳形变与地震,1999,19(增1):179-181.
[3]林松建,连玉平,陈伟为.福建水口水库地区地震震源机制解特征分析[J].地震,2007,27(1):114-119.
[4]林松建、黄昭,连玉平,等.福建水口水库诱发地震特征及发震断裂的探讨[J].大地测量与地球动力学,2007,27(1):40-44.
[5]福建省地震局.福建省地震监测志[M].北京,地震出版社,2005.
[6]林松建,陈为伟,郑师春.福建地区地震震源深度特征的统计分析[J].地震,2010,30(1):82-89.
[7]崔效锋、谢富仁、赵建涛.中国及邻区震源机制解分区特征[J].地震地质,2005,27(2):298-307.
[8]Zoback M L.First-and second-order patterns of stress in the lithosphere:the world stress map project[J].JGeophys Res,1992,97(B8):11703-11728.
[9]卓秀榕,陈光桐.闽台震源机制和区域应力场[J].地震学报,1983,5(4):397-411.
[10]鄢家全、时振梁、汪素云,等.中国及邻区现代构造应力场的区域特征[J].地震学报,1979,1(1):9-24.
[11]周硕愚,帅平,郭逢英,等.中国福建及其边缘海域现时地壳运动定量研究——GPS、断层形变和水准等测量与震源机制结果的综合分析[J].地震学报,2000,22(1):66-72.
[12]林松建,丁学仁,陈为伟,等.福建地区震源机制解与现代构造应力场[J].大地测量与地球动力学,2009,29(5):27-32.
[13]郑小菁,林颐耀,李华.水口库区水位与地震活动的关系[J].地壳形变与地震,1999,19(增1):179-181.
[14]胡毓良、陈献程、张忠连,等.浙江湖南镇水库的诱发地震(中、英文)[J].地震地质,1986,8(4):1-25.
[15]胡聿贤主编.地震安全性评价技术教程[M].北京:地震出版社,1999.
[16]杨马陵,何萍,万永芳.河源新丰江地区地震烈度、地震影响场与新丰江水库大坝设防烈度[J].华南地震,2009,29(4):1-7.
①福建省地震历史资料组.福建省地震历史资料汇编.1979.
①福建省地震历史资料组.福建省地震历史资料汇编.1979.
②丁原章.福建水口水库诱发地震研讨会上的讲话,福州,1997.
[1]彭美凤、林世敏、林松建.水口水库地震及其活动特征[J].华南地震,1997,17(2):83-89.
[2]郑小菁,林颐耀,李华.水口库区水位与地震活动的关系[J].地壳形变与地震,1999,19(增1):179-181.
[3]林松建,连玉平,陈伟为.福建水口水库地区地震震源机制解特征分析[J].地震,2007,27(1):114-119.
[4]林松建、黄昭,连玉平,等.福建水口水库诱发地震特征及发震断裂的探讨[J].大地测量与地球动力学,2007,27(1):40-44.
[5]福建省地震局.福建省地震监测志[M].北京,地震出版社,2005.
[6]林松建,陈为伟,郑师春.福建地区地震震源深度特征的统计分析[J].地震,2010,30(1):82-89.
[7]崔效锋、谢富仁、赵建涛.中国及邻区震源机制解分区特征[J].地震地质,2005,27(2):298-307.
[8]Zoback M L.First-and second-order patterns of stress in the lithosphere:the world stress map project[J].JGeophys Res,1992,97(B8):11703-11728.
[9]卓秀榕,陈光桐.闽台震源机制和区域应力场[J].地震学报,1983,5(4):397-411.
[10]鄢家全、时振梁、汪素云,等.中国及邻区现代构造应力场的区域特征[J].地震学报,1979,1(1):9-24.
[11]周硕愚,帅平,郭逢英,等.中国福建及其边缘海域现时地壳运动定量研究——GPS、断层形变和水准等测量与震源机制结果的综合分析[J].地震学报,2000,22(1):66-72.
[12]林松建,丁学仁,陈为伟,等.福建地区震源机制解与现代构造应力场[J].大地测量与地球动力学,2009,29(5):27-32.
[13]郑小菁,林颐耀,李华.水口库区水位与地震活动的关系[J].地壳形变与地震,1999,19(增1):179-181.
[14]胡毓良、陈献程、张忠连,等.浙江湖南镇水库的诱发地震(中、英文)[J].地震地质,1986,8(4):1-25.
[15]胡聿贤主编.地震安全性评价技术教程[M].北京:地震出版社,1999.
[16]杨马陵,何萍,万永芳.河源新丰江地区地震烈度、地震影响场与新丰江水库大坝设防烈度[J].华南地震,2009,29(4):1-7.
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