小湾水库蓄水前后的水库地震波速比变化初探
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摘要
利用小湾水库地震台网连续、完整的地震波资料,计算小湾水库蓄水前、后各1年地震密集区域的小震波速比变化,并分析3级地震震前波速比的显著异常变化特征。结果表明:小湾库区澜沧江段的昌宁、凤庆,黑惠江库区的巍山牛街一带为震群丛集区,且库尾凤庆区域平均波速比低于中段的昌宁区,空间上呈非均匀分布。水库蓄水仅对凤庆区的地下介质有一定的影响,蓄水前后3级地震震前波速比均呈显著低值异常,2009年8月6日凤庆3.5级地震为蓄水后的最大地震,初步判定为水库诱发的构造地震或构造型水库诱发地震。
Using continuous and complete data of small earthquakes recorded by Xiaowan Reservoir Seismic Network,we calculate the variation of seismic wave velocity ratio for one year before and after water storage of Xiaowan Reservoir in earthquake cluster area,and analyze significant anomaly of wave velocity ratio before M3.0 earthquakes.The results indicate that earthquake swarm area distributes on Changning and Fengqing Counties of Lancang River Fault in Xiaowan Reservoir and Niujie Township in Weishan County in Heihuijiang Reservoir.The wave velocity ratio of Fengqing area in back reservoir is lower than that of Changning area in the middle of the reservoir,and it distributes non-uniform in space.The water storage of reservoir has certain influence on the underground medium in Fengqing area.The wave velocity ratio before M3.0 earthquakes appears lower value anomaly before water storage.An Fengqing M3.5 earthquake occurred on Aug.6 in 2009,which is the biggest earthquake in Xiaowan Reservoir after water storage,and induced to be the tectonic earthquake induced by reservoir or tectonic reservoir-induced earthquake.
Using continuous and complete data of small earthquakes recorded by Xiaowan Reservoir Seismic Network,we calculate the variation of seismic wave velocity ratio for one year before and after water storage of Xiaowan Reservoir in earthquake cluster area,and analyze significant anomaly of wave velocity ratio before M3.0 earthquakes.The results indicate that earthquake swarm area distributes on Changning and Fengqing Counties of Lancang River Fault in Xiaowan Reservoir and Niujie Township in Weishan County in Heihuijiang Reservoir.The wave velocity ratio of Fengqing area in back reservoir is lower than that of Changning area in the middle of the reservoir,and it distributes non-uniform in space.The water storage of reservoir has certain influence on the underground medium in Fengqing area.The wave velocity ratio before M3.0 earthquakes appears lower value anomaly before water storage.An Fengqing M3.5 earthquake occurred on Aug.6 in 2009,which is the biggest earthquake in Xiaowan Reservoir after water storage,and induced to be the tectonic earthquake induced by reservoir or tectonic reservoir-induced earthquake.
引文
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毛玉平,王洋龙,李朝才.2004.澜沧江水利枢纽工程中段水库诱发地震地质环境分析[J].地震研究,27(增刊):63-69.
毛玉平,王洋龙,李朝才.2006.小湾库区水库诱发地震地质环境分析[M]//水库诱发地震监测与研究.昆明:云南科技出版社.
梅世蓉,冯德益.1993.中国地震预报概论[M].北京:地震出版社;.
王海涛,敖雪明,杨马陵,等.1992.单台地震预报的地震学方法[M].北京:地震出版社.
邹振轩,李金龙,俞铁宏.2006.应用多台和达法测定温州珊溪水库地区地震的平均波速比[J].地震,26(4):133-137.
Baecher G B,Keeney R L.1982.Statistical Examination of Reservoir-in-duced Seismicity[J].Bull Seiamol Soc Am,72:553-569.
Packer D R,Cluff L S D,Knuepfer P L,et al.1979.A study of ReservoirInducrd Seismicity[R].Woodward Clyde Consultans U S A,U S Ge-ol Surv,Contr Nr14-08-001-16809,unpubl,report.
冯德益,虞雪君,盛国英.1993.波速异常的进一步研究和问题讨论(三)——水库诱发地震前的VP/VS异常[J].西北地震学报,15(3):38-43.
傅淑芳,刘宝诚,李文艺,等.1980.地震学教程(下册)[M].北京:地震出版社.
耿乃光,郝晋升,李纪汉,等.1992.岩石的波速比与静水压的关系[J].地震学报,14(4):501-506.
阚荣举,韩源.1992.云南遮放—马龙地学断面[M].北京:地震出版社.
李华晔.1999.水库诱发地震与环境关系的研究[J].华北水利水电学院学报,20(1):32-37.
李永莉,毛慧玲,赵小艳,等.2008.云南地区数字地震波波速比的区域特征[J].地震研究,31(3):203-208.
毛玉平,王洋龙,李朝才.2004.澜沧江水利枢纽工程中段水库诱发地震地质环境分析[J].地震研究,27(增刊):63-69.
毛玉平,王洋龙,李朝才.2006.小湾库区水库诱发地震地质环境分析[M]//水库诱发地震监测与研究.昆明:云南科技出版社.
梅世蓉,冯德益.1993.中国地震预报概论[M].北京:地震出版社;.
王海涛,敖雪明,杨马陵,等.1992.单台地震预报的地震学方法[M].北京:地震出版社.
邹振轩,李金龙,俞铁宏.2006.应用多台和达法测定温州珊溪水库地区地震的平均波速比[J].地震,26(4):133-137.
Baecher G B,Keeney R L.1982.Statistical Examination of Reservoir-in-duced Seismicity[J].Bull Seiamol Soc Am,72:553-569.
Packer D R,Cluff L S D,Knuepfer P L,et al.1979.A study of ReservoirInducrd Seismicity[R].Woodward Clyde Consultans U S A,U S Ge-ol Surv,Contr Nr14-08-001-16809,unpubl,report.
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