紫坪铺水库区小地震震源机制研究
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摘要
用紫坪铺水库专用台网的地震记录测定紫坪铺水库区262次小震震源机制参数,结果表明:节面I的优势方向与断裂走向展布一致性很好;库区地震断层有逆断层、正断层、左旋和右旋走滑断层,走滑断层占45%;库区断层66%陡峻,35%几近直立;受水库蓄水的影响,2006年7月1日后以走滑断层活动方式明显增多,水库地震群时段走滑断层活动方式表现突出。
The focal mechanism parameters of 262 small earthquakes recorded by Zipingpu reservoir earthquake monitoring network are calculated.The results show that the dominant strike of nodal planeⅠand rupture are in good consistency.There are reverse fault,normal fault,left-lateral and right-lateral strike-slip fault in the reservoir area and the percentage of strike-slip fault amounts to 45%.Of all the faults,66%are steep and 35%are almost vertical.As a result of the impact of reservoir impoundment, the strike-slip type faulting has obviously increased since 1 July 2006,and this type of faulting became dominant during the period of the reservoir earthquake swarm.
The focal mechanism parameters of 262 small earthquakes recorded by Zipingpu reservoir earthquake monitoring network are calculated.The results show that the dominant strike of nodal planeⅠand rupture are in good consistency.There are reverse fault,normal fault,left-lateral and right-lateral strike-slip fault in the reservoir area and the percentage of strike-slip fault amounts to 45%.Of all the faults,66%are steep and 35%are almost vertical.As a result of the impact of reservoir impoundment, the strike-slip type faulting has obviously increased since 1 July 2006,and this type of faulting became dominant during the period of the reservoir earthquake swarm.
引文
陈运泰主编.2003.地震参数:数字地震学在地震预测中的应用[M].北京:地震出版社:26-43.
CHEN Yun-tai(ed).2003.Earthquake Parameters:Digital Seismology and Its Application in Earthquake Prediction [M].Seismological Press,Beijing.26-43(in Chinese).
何玉林,胡先明.1992.岷江-沱江水系及新构造应力场[J].四川地震,(3):30-34.
HE Yu-lin,HU Xian-ming.1992.Drainage system of Minjiang and Tojiang rivers and neotectonic stress field[J]. Earthquake Research in Sichuan,(3):30-34(in Chinese).
胡先明,谢蓉华.2006.紫坪铺水库地震台网记录地震的复杂性[J].四川地震,(2):17-20.
HU Xian-ming,XIE Rong-hua.2006.Seismic recording complexity of Zipinpu Dam telemetered seismic network[J]. Earthquake Research in Sichuan,(2):17-20(in Chinese).
胡先明.2007.紫坪铺水库蓄水前天然地震活动[J].四川地震,(2):16-21.
HU Xian-ming.2007.Seismicity background around Zipingpu Dam before impounding[J].Earthquake Research in Sichuan,(2):16-21(in Chinese).
胡先明,谢蓉华,韩进,等.2008.水库诱发地震中水体下方的地震波速比[J].地震研究,31(3):215-221.
HU Xian-ming,XIE Rong-hua,HAN Jin,et al.2008.Seismic wave velocity ratio under water body of reservoir during reservoir-induced earthquakes[J].Journal of Seismological Research,31(3):215-221(in Chinese).
雷兴林,马胜利,闻学泽,等.2008.地表水体对断层应力与地震时空分布影响的综合分析:以紫坪铺水库为例[J].地震地质,30(4):1046-1065.
LEI Xing-lin,MA Sheng-li,WEN Xue-ze,et al.2008.Integrated analysis of stress and regional seismicity by surface loading:A case study of Zipingpu Reservoir[J].Seismology and Geology,30(4):1046-1065(in Chinese).
梁尚鸿,李幼铭,束沛镒,等.1984.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报, 27(3):247-257.
LIANG Shang-hong,LI You-ming,SHU Pei-yi,et al.1984.On the determining of source parameters of small earthquakes by using amplitude ratios of P and S from regional network observations[J].Chinese J Geophys,27(3): 247-257(in Chinese).
马保起,苏刚,候治华,等.2005.利用岷江阶地的变形估算龙门山断裂带中段晚第四纪滑动速率[J].地震地质,27(2):234-242.
M A Bao-qi,SU Gang,HOU Zhi-hua,et al.2005.Late Quaternary slip rate in the central part of the Longmenshan Fault zone from terrace deformation along the Minjiang River[J].Seismology and Geology,27(2):234-242(in Chinese ).
唐文清,刘宇平,陈智梁,等.2004.龙门山断裂构造带GPS研究[J].大地测量与地球动力学,24(3):57-59.
TANG Wei-qing,LIU Yu-ping,CHEN Zhi-liang,et al.2004.GPS study on Longmenshan Fault zone[J].Journal of Geodesy and Geodynamics,24(3):57-59(in Chinese).
唐荣昌,韩渭宾主编.1993.四川活动断裂与地震[M].北京:地震出版社.123.
TANG Rong-chang,HAN Wei-bin(eds).1993.Active Faults and Earthquakes in Sichuan[M].Seismological Press, Beijing.123.
王萍,付碧宏,张斌,等.2009.汶川8.0级地震地表破裂带与岩性关系[J].地球物理学报,52(1):131-139.
WANG Ping,FU Bi-hong,ZHANG Bin,et al.2009.Relationships between surface ruptures and lithologic characteristics of the Wenchuan 8.0 earthquake[J].Chinese J Geophys,52(1 ):131-139(in Chinese).
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[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- 1 3(in Chinese).
张永久,程万正.2007.用P、S波速度振幅比求小震机制解的可行性研究[J].中国地震,23(4):366-374.
ZHANG Yong-jiu,CHENG Wan-zheng.2007.Feasibility study on determining focal mechanism of small earthquakes using amplitude ratio of P and S waves[J].Earthquake Research in China,23(4):366-3774(in Chinese).
张致伟,程万正,阮祥,等.2009.汶川8.0级地震前龙门山断裂带的地震活动性和构造应力场特征[J].地震学报,31(2):117-127.
ZHANG Zhi-wei,CHENG Wan-zheng,RUAN Xiang,et al.2009.Seismicity and tectonic stress of the Longmenshan Fault zone before 2008 Wenchuan M_S 8.0 earthquake[J].Acta Seismologica Sinica,31(2):117-127(in Chinese ).
CHEN Yun-tai(ed).2003.Earthquake Parameters:Digital Seismology and Its Application in Earthquake Prediction [M].Seismological Press,Beijing.26-43(in Chinese).
何玉林,胡先明.1992.岷江-沱江水系及新构造应力场[J].四川地震,(3):30-34.
HE Yu-lin,HU Xian-ming.1992.Drainage system of Minjiang and Tojiang rivers and neotectonic stress field[J]. Earthquake Research in Sichuan,(3):30-34(in Chinese).
胡先明,谢蓉华.2006.紫坪铺水库地震台网记录地震的复杂性[J].四川地震,(2):17-20.
HU Xian-ming,XIE Rong-hua.2006.Seismic recording complexity of Zipinpu Dam telemetered seismic network[J]. Earthquake Research in Sichuan,(2):17-20(in Chinese).
胡先明.2007.紫坪铺水库蓄水前天然地震活动[J].四川地震,(2):16-21.
HU Xian-ming.2007.Seismicity background around Zipingpu Dam before impounding[J].Earthquake Research in Sichuan,(2):16-21(in Chinese).
胡先明,谢蓉华,韩进,等.2008.水库诱发地震中水体下方的地震波速比[J].地震研究,31(3):215-221.
HU Xian-ming,XIE Rong-hua,HAN Jin,et al.2008.Seismic wave velocity ratio under water body of reservoir during reservoir-induced earthquakes[J].Journal of Seismological Research,31(3):215-221(in Chinese).
雷兴林,马胜利,闻学泽,等.2008.地表水体对断层应力与地震时空分布影响的综合分析:以紫坪铺水库为例[J].地震地质,30(4):1046-1065.
LEI Xing-lin,MA Sheng-li,WEN Xue-ze,et al.2008.Integrated analysis of stress and regional seismicity by surface loading:A case study of Zipingpu Reservoir[J].Seismology and Geology,30(4):1046-1065(in Chinese).
梁尚鸿,李幼铭,束沛镒,等.1984.利用区域地震台网P、S振幅比资料测定小震震源参数[J].地球物理学报, 27(3):247-257.
LIANG Shang-hong,LI You-ming,SHU Pei-yi,et al.1984.On the determining of source parameters of small earthquakes by using amplitude ratios of P and S from regional network observations[J].Chinese J Geophys,27(3): 247-257(in Chinese).
马保起,苏刚,候治华,等.2005.利用岷江阶地的变形估算龙门山断裂带中段晚第四纪滑动速率[J].地震地质,27(2):234-242.
M A Bao-qi,SU Gang,HOU Zhi-hua,et al.2005.Late Quaternary slip rate in the central part of the Longmenshan Fault zone from terrace deformation along the Minjiang River[J].Seismology and Geology,27(2):234-242(in Chinese ).
唐文清,刘宇平,陈智梁,等.2004.龙门山断裂构造带GPS研究[J].大地测量与地球动力学,24(3):57-59.
TANG Wei-qing,LIU Yu-ping,CHEN Zhi-liang,et al.2004.GPS study on Longmenshan Fault zone[J].Journal of Geodesy and Geodynamics,24(3):57-59(in Chinese).
唐荣昌,韩渭宾主编.1993.四川活动断裂与地震[M].北京:地震出版社.123.
TANG Rong-chang,HAN Wei-bin(eds).1993.Active Faults and Earthquakes in Sichuan[M].Seismological Press, Beijing.123.
王萍,付碧宏,张斌,等.2009.汶川8.0级地震地表破裂带与岩性关系[J].地球物理学报,52(1):131-139.
WANG Ping,FU Bi-hong,ZHANG Bin,et al.2009.Relationships between surface ruptures and lithologic characteristics of the Wenchuan 8.0 earthquake[J].Chinese J Geophys,52(1 ):131-139(in Chinese).
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[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- 1 3(in Chinese).
张永久,程万正.2007.用P、S波速度振幅比求小震机制解的可行性研究[J].中国地震,23(4):366-374.
ZHANG Yong-jiu,CHENG Wan-zheng.2007.Feasibility study on determining focal mechanism of small earthquakes using amplitude ratio of P and S waves[J].Earthquake Research in China,23(4):366-3774(in Chinese).
张致伟,程万正,阮祥,等.2009.汶川8.0级地震前龙门山断裂带的地震活动性和构造应力场特征[J].地震学报,31(2):117-127.
ZHANG Zhi-wei,CHENG Wan-zheng,RUAN Xiang,et al.2009.Seismicity and tectonic stress of the Longmenshan Fault zone before 2008 Wenchuan M_S 8.0 earthquake[J].Acta Seismologica Sinica,31(2):117-127(in Chinese ).
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