加速度与水库诱发地震烈度关系研究
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摘要
以地震圆盘形破裂位错模式为基础,并以新的思路,把震源应力降参数引入预测公式,得出了新的地震动加速度预测方程:lg(rapeqr)=Ca+1/6lgM0+5/6lgΔσ,与传统的衰减关系不同,表明地震动加速度不仅与震源强度M0有关,还与震源应力背景有关。在此基础上,利用水库诱发地震震中烈度I0资料,详细分析研究了诱发地震动加速度、烈度与震级关系,并且从理论上讨论了水库诱发地震烈度与构造地震烈度的差异性以及力学原因,给出了水库诱发地震与震源参数间的几个统计关系:M=1.05I0-2.45;lga0=-2.1+1/4M+5/6lgΔσ;M=-3.6+1.2I0-3.33lgΔσ;lga=0.3I0-3.0;震源破裂长度-震级关系:lgL=1/2M-1.87。这些关系式对了解水库诱发地震的破裂过程及灾害预测有实际的应用价值。
Based on disk-shaped dislocation model,the function for forecasting ground motion acceleration is calculated.We introduced stress drop into the function and obtained new relation to forecast attenuation of ground motion acceleration,lg(rapeqr)=Ca+1/6lgM0+5/6lgΔσ.Contrasting with traditional attenuation relation,we found ground motion acceleration not only correlated with magnitude but also with background stress in source region.Based above,using epicentral intensity data of reservoir induced earthquake I0,we obtained the relations between acceleration,intensity and magnitude of reservoir induced earthquake,then theoretically analyzed the intensity difference between reservoir induced earthquake and tectonic earthquake and its mechanical cause.We also obtained several statistical relations between source parameters of reservoir induced earthquake,M=1.05I0-2.45,lga0=-2.1+1/4lgM+5/6lgΔσ,M=-3.6+1.2I0-3.33lgΔσ,lga=0.3I0-3.0.The relation between magnitude and source rupture length,lgL=1/2M-1.87.These relations have practical values for realizing rupture process of reservoir induced earthquake and forecasting it.
Based on disk-shaped dislocation model,the function for forecasting ground motion acceleration is calculated.We introduced stress drop into the function and obtained new relation to forecast attenuation of ground motion acceleration,lg(rapeqr)=Ca+1/6lgM0+5/6lgΔσ.Contrasting with traditional attenuation relation,we found ground motion acceleration not only correlated with magnitude but also with background stress in source region.Based above,using epicentral intensity data of reservoir induced earthquake I0,we obtained the relations between acceleration,intensity and magnitude of reservoir induced earthquake,then theoretically analyzed the intensity difference between reservoir induced earthquake and tectonic earthquake and its mechanical cause.We also obtained several statistical relations between source parameters of reservoir induced earthquake,M=1.05I0-2.45,lga0=-2.1+1/4lgM+5/6lgΔσ,M=-3.6+1.2I0-3.33lgΔσ,lga=0.3I0-3.0.The relation between magnitude and source rupture length,lgL=1/2M-1.87.These relations have practical values for realizing rupture process of reservoir induced earthquake and forecasting it.
引文
陈培善,李保昆,白彤霞.1998.根据构造环境应力场预测峰值水平加速度[J].地球物理学报,41(4):502～517
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秦嘉政,钱晓东.2005.云南强震能量释放的时空特征研究[J].地震研究,28(4):307～312
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杨清源,戴丽思.1997.水库诱发地震的地震动特征[J].西北地震学报,1(1):64～69
易立新,车用太,王广才.2003.水库诱发地震研究历史、现状与发展趋势[J].华南地震,23(1):28～37
张俊伟.1999.水库诱发地震区预测与强度评估[J].地震地磁观测与研究,20(2):47～51
Brune J N.1970.Tectonic stress and spectra of seismic shear wave fromearthquake[J].J Geophys Res,75,4997～5009
Gupta I D and Rambabu V.1993.Source parameters of some significant earthquakes near Koyna Dam[J].India,Pure,Appl.Geophy,140,403～413
Kanamori H.1997.The energy release in great earthquakes[J].J Geophys Res,82:2978～2981
Linyue Chen and Tal wani T.1998.Reservoir-induced seismicity in China[J].India,Pure,Appl Geophy,153,133～149
Mandal,Rastogi P B Kand Sarma C S P.1998.Source Parameters of Koyna Earthquakes,India[J].Bull SeismSoc Amer,88(3):833～842
陈培善,成瑾,白彤霞.2001.根据构造环境剪应力值水平区分地震和核爆炸[J].地震学报,23(3):246～249
李永莉,秦嘉政,董天禹等.2004.澜沧江漫湾电站水库诱发地震分析[J].地震地磁观测与研究,25(3):51～57
秦嘉政.1989.云南地区短周期波区域Q值与地震烈度衰减关系[M].见:云贵地区地震危险性研究文集,昆明:云南科技出版社,253～260
秦嘉政,钱晓东.2005.云南强震能量释放的时空特征研究[J].地震研究,28(4):307～312
王妙月,杨懋源等.1976.新丰江水库诱发地震的震源机制及其成因初步探讨[J].地球物理学报,19(1):1～17
吴忠良,陈运泰,牟其铎.1994.核爆炸地震概要[M].北京:地震出版社
杨清源,戴丽思.1997.水库诱发地震的地震动特征[J].西北地震学报,1(1):64～69
易立新,车用太,王广才.2003.水库诱发地震研究历史、现状与发展趋势[J].华南地震,23(1):28～37
张俊伟.1999.水库诱发地震区预测与强度评估[J].地震地磁观测与研究,20(2):47～51
Brune J N.1970.Tectonic stress and spectra of seismic shear wave fromearthquake[J].J Geophys Res,75,4997～5009
Gupta I D and Rambabu V.1993.Source parameters of some significant earthquakes near Koyna Dam[J].India,Pure,Appl.Geophy,140,403～413
Kanamori H.1997.The energy release in great earthquakes[J].J Geophys Res,82:2978～2981
Linyue Chen and Tal wani T.1998.Reservoir-induced seismicity in China[J].India,Pure,Appl Geophy,153,133～149
Mandal,Rastogi P B Kand Sarma C S P.1998.Source Parameters of Koyna Earthquakes,India[J].Bull SeismSoc Amer,88(3):833～842
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