汶川8.0级地震后紫坪铺水库库区地震的分布特征
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摘要
采用双差定位方法对紫坪铺水库库区12个地震台站2009年记录的857个地震进行了重新定位,获得了815个地震的震源位置。定位结果显示库区有3个地震相对集中区域,在各个集中区域地震震源深度的分布特征各不相同。与已有的汶川8.0级地震前库区地震精定位的研究结果相比较,汶川8.0级地震后库区地震相对集中区域的位置关系发生了明显变化。
815 aftershocks of Wenchuan earthquake recorded by 12 seismic stations in 2009 were relocated using the double difference algorithm to analyze the seismic activity of the Zipingpu reservoir.Relocation results show that the epicenters of aftershocks concentrate relatively in three regions.Focal depth distribution characters of different concentration regions take on obvious difference.This means earthquakes in different concentration regions may have different causes.Compared with relocations of earthquakes taking place before the Wenchuan earthquake done by other researchers,locations of the seismic concentration regions in the reservoir area changed noticeably after the Wenchuan earthquake.These variations are related with the stress adjustment of local part in the reservoir area and may also be related with the diffusion depth and range of increased pore pressure caused by rock failure in the course of Wenchuan earthquake.
815 aftershocks of Wenchuan earthquake recorded by 12 seismic stations in 2009 were relocated using the double difference algorithm to analyze the seismic activity of the Zipingpu reservoir.Relocation results show that the epicenters of aftershocks concentrate relatively in three regions.Focal depth distribution characters of different concentration regions take on obvious difference.This means earthquakes in different concentration regions may have different causes.Compared with relocations of earthquakes taking place before the Wenchuan earthquake done by other researchers,locations of the seismic concentration regions in the reservoir area changed noticeably after the Wenchuan earthquake.These variations are related with the stress adjustment of local part in the reservoir area and may also be related with the diffusion depth and range of increased pore pressure caused by rock failure in the course of Wenchuan earthquake.
引文
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陈九辉,刘启元,李顺成,等.2009.汶川MS8.0地震余震序列重新定位及其地震构造研究[J].地球物理学报,52(2):390—397.CHEN Jiu-hui,LIU Qi-yuan,LI Shun-cheng,et al.2009.Seismotectonic study by relocation of the WenchuanMS8.0earthquake sequence[J].Chinese J Geophys,52(2):390—397(in Chinese).
陈颙.2009.汶川地震是由水库蓄水引起的吗-[J].中国科学(D辑),39(3):257—259.CHEN Yong.2009.Did the reservoir impoundment trigger the Wenchuan earthquake-[J].Science in China(Ser D),52(4):431—433.
黄媛,吴建中,张天中,等.2008.汶川8.0级大地震及其余震序列重定位研究[J].中国科学(D辑),38(10):1242—1249.HUANG Yuan,WU Jian-zhong,ZHANG Tian-zhong,et al.2008.Relocation of theMS8.0Wenchuan earthquake andits aftershock sequence[J].Science in China(Ser D),51(12):1703—1712.
吕坚,苏金蓉,靳玉科,等.2008.汶川8.0级地震序列重新定位及其发震构造初探[J].地震地质,30(4):917—925.LV Jian,SU Jin-rong,JIN Yu-ke,et al.2008.Discussion on relocation and seismo-tectonics of theMS8.0Wenchuanearthquake sequences[J].Seismology and Geology,30(4):917—925(in Chinese).
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[J].地震,30(2):10—19.LU Xian,ZHANG Xiao-dong,ZHOU Long-quan,et al.2010.Accurate relocation and analysis of earthquakes in theZipingpu Reservoir area,Sichuan,China[J].Earthquake,30(2):10—19(in Chinese).
王云基.2001.四川紫坪铺水库库区水文地质与工程地质条件研究[J].四川地震,(2):6—13.WANG Yun-ji.2001.Hydro-geologic and engineering-geologic conditions of Zipingpu Reservoir area,Sichuan[J].Earthquake Research in Sichuan,(2):6—13(in Chinese).
徐锡伟,闻学泽,叶建青,等.2008.汶川MS8.0地震地表破裂带及其发震构造[J].地震地质,30(3):597—629.XU Xi-wei,WEN Xue-ze,YE Jian-qing,et al.2008.TheMS8.0Wenchuan earthquake surface ruptures and its seis-mogenic structure[J].Seismology and Geology,30(3):597—629(in Chinese).
杨智娴,陈运泰,郑月军,等.2003.双差地震定位算法在中国中西部地区地震精确定位中的应用[J].中国科学(D辑),46(增刊):181—188.YANG Zhi-xian,CHEN Yun-tai,ZHENG Yue-jun,et al.2003.Accurate relocation of earthquakes in central-westernChina using the double difference earthquake location algorithm[J].Science in China(Ser D),33(Suppl):129—134.
赵珠,范军,郑斯华,等.1997.龙门山推覆构造带地壳速度结构和震源位置的精确修订[J].地震学报,19(6):615—622.ZHAO Zhu,FAN Jun,ZHENG Si-hua,et al.1997.Precision determination of the crustal structure and hypocentral loca-tions in the Longmenshan thrust nappe belt[J].Acta Seismologica Sinica,19(6):615—622(in Chinese).
朱艾斓,徐锡伟,周永胜,等.2005.川西地区小震重新定位及其活动构造意义[J].地球物理学报,48(3):629—636.ZHU Ai-lan,XUXi-wei,ZHOUYong-sheng,et al.2005.Relocation of small earthquakes in western Sichuan,China andits implications for active tectonics[J].Chinese J Geophys,48(3):629—636(in Chinese).
Ge S,Liu M,Lu N,et al.2009.Did the Zipingpu Reservoir trigger the2008Wenchuan earthquake-[J].Geophys ResLett,36,L20315.doi:10.1029/2009GL040349.
Kerr R A,Stone R.2009.A human trigger for the great quake of Sichuan-[J].Science,323:322.
Kerr R A,Stone R.2010.Two years later,new rumblings over origins of Sichuan Quake[J].Science,327:1184.
Masuda K,Nishizawa O,Kusunose K,et al.1990.Positive feedback fracture process induced by nonuniform high-pres-sure water flow in dilatant granite[J].J Geophys Res,95(B13):21583—21592.
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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