紫坪铺水库区域地震波速比计算及研究
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摘要
利用多台和达法计算紫坪铺水库区域地震波速比,结果显示,紫坪铺水库西南区绝大多数的波速比值为1.6～1.8,平均值为1.74,波速比随时间的变化与地震的发生表现为正常-降低-发震的关系。水库西南区发震概率与水库蓄水相关性最为明显,该区域在蓄水高峰期都有地震增多的现象,且较大地震几乎均发生在水库卸载阶段,在此时段内的波速比值下降。水库西南区的平均波速比高于水库东北区的平均波速比,初步判断这与水库西南区的断裂构造分布及地下介质性质有关。
According to the multi-station method and using digital seismic records in the Zipingpu reservoir,we studied the seismic velocity ratio.The result shows that the wave velocity ratios in the southwest area of Zipingpu reservoir are most between 1.6 and 1.8,and its average seismic wave velocity ratio is 1.74.The wave-velocity ratio formed a pattern of normality,fall and earthquake occurrence.The probability of earthquake in the southwest area of reservoir affected by reservoir impounding was most pronounced,and there were more earthquakes in the water peak.Larger earthquakes in the southwest area of Zipingpu reservoir are corresponding to the unloading process in the reservoir and the falling of the wave velocity ratios.The average wave velocity ratio in the southwest area of Zipingpu reservoir was higher than the northeast area.It can therefore be inferred that the phenomenon is related to the fault distribution and the underground media of the region of the southwest area of Zipingpu reservoir.
According to the multi-station method and using digital seismic records in the Zipingpu reservoir,we studied the seismic velocity ratio.The result shows that the wave velocity ratios in the southwest area of Zipingpu reservoir are most between 1.6 and 1.8,and its average seismic wave velocity ratio is 1.74.The wave-velocity ratio formed a pattern of normality,fall and earthquake occurrence.The probability of earthquake in the southwest area of reservoir affected by reservoir impounding was most pronounced,and there were more earthquakes in the water peak.Larger earthquakes in the southwest area of Zipingpu reservoir are corresponding to the unloading process in the reservoir and the falling of the wave velocity ratios.The average wave velocity ratio in the southwest area of Zipingpu reservoir was higher than the northeast area.It can therefore be inferred that the phenomenon is related to the fault distribution and the underground media of the region of the southwest area of Zipingpu reservoir.
引文
陈俊华、甘家思、李普丽等,2007,三峡水库蓄水后巴东地区波速比(VP/VS)研究,大地测量与地球动力学,27(专辑),12～14。
陈俊华、甘家思、魏贵春等,2011,水库断层岩溶带地震波波速比研究,人民长江,42(3),23～26。
冯德益,1981,地震波速异常,北京:地震出版社,11～22。
黎明晓、张晓东,2004,应用多台法测定华北地区地壳的平均波速比,地震,24(1),163～169。
李善邦,1981,中国地震,北京,地震出版社。
卢显、张晓东、周龙泉等,2010,紫坪铺水库库区地震精定位研究及分析,地震,30(2),10～19。
王林瑛、郭永霞、刘芳等,2008,文安地震前后首都圈分区波速比时变特征,地震学报,30(3),240～253。
王云基,2001,四川紫坪铺水库区水文地质与工程地质条件研究,四川地震,99(2),6～13。
岳晓媛、王林瑛、武安绪,2008,北京地区地震波速比异常变化与首都圈中等地震的关系研究,地震地磁观测与研究,29(3),10～13。
赵明淳、刁桂苓、张学民,2005,首都圈平均波速比分析,西北地震报,27(3),246～254。
Christansen N I,1996,Poisson's ratio and crustal seismology,J Geophys Res,101,3139～3156.
Zhao D,Hasegawa A,Horiuchi S,1992,Tomographic imaging of P and S wave velocity structure eneath northeastern Japan,JGeophys Res,97(B13),19909～19928.
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陈俊华、甘家思、魏贵春等,2011,水库断层岩溶带地震波波速比研究,人民长江,42(3),23～26。
冯德益,1981,地震波速异常,北京:地震出版社,11～22。
黎明晓、张晓东,2004,应用多台法测定华北地区地壳的平均波速比,地震,24(1),163～169。
李善邦,1981,中国地震,北京,地震出版社。
卢显、张晓东、周龙泉等,2010,紫坪铺水库库区地震精定位研究及分析,地震,30(2),10～19。
王林瑛、郭永霞、刘芳等,2008,文安地震前后首都圈分区波速比时变特征,地震学报,30(3),240～253。
王云基,2001,四川紫坪铺水库区水文地质与工程地质条件研究,四川地震,99(2),6～13。
岳晓媛、王林瑛、武安绪,2008,北京地区地震波速比异常变化与首都圈中等地震的关系研究,地震地磁观测与研究,29(3),10～13。
赵明淳、刁桂苓、张学民,2005,首都圈平均波速比分析,西北地震报,27(3),246～254。
Christansen N I,1996,Poisson's ratio and crustal seismology,J Geophys Res,101,3139～3156.
Zhao D,Hasegawa A,Horiuchi S,1992,Tomographic imaging of P and S wave velocity structure eneath northeastern Japan,JGeophys Res,97(B13),19909～19928.
#12
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