玉树7.1级地震余震重新定位及其时空分布特征研究
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摘要
采用双差地震定位法对2010-04-14—12-31日发生的玉树地震余震进行了重新定位。结果表明:余震分布区随时间发生转移,与应力增长区变化有关。余震分布呈现空间非均匀性,隆宝两侧的余震在密集程度、分布带宽度以及震源深度上均存在差异。玉树地震余震主要发震构造为倾向北东、倾角近乎直立的甘孜-玉树断裂带北支。隆宝西北的高密度余震群不仅与玉树-隆宝断裂有关,更主要是与近垂直于玉树-隆宝断裂的北东向"软弱面"有关。
A part of the aftershocks of Yushu earthquake occurred from April 14 to December 31,2010,were relocated by means of the double difference algorithm.These following conclusions can be obtained from the results.The area changing of stress growth led to aftershocks distribution shifting over time.The aftershock distribution presents spatial inhomogeneity.On both sides of Longbao,the intensity,width and the focal depth of the aftershocks are different.The seismogenic fault of aftershocks of Yushu earthquakes is the northern branch of Garzê-Yushu fault zone,i.e.Yushu-Longbao fault,which dips to northeast with high-angle left-lateral strike-slip.To the northwest of Longbao town,the intensively distributed aftershock group is not only due to Yushu-Longbao fault zone,the more important seismogenesis is that the northwest "weak plane" is nearly vertical to the fault.
A part of the aftershocks of Yushu earthquake occurred from April 14 to December 31,2010,were relocated by means of the double difference algorithm.These following conclusions can be obtained from the results.The area changing of stress growth led to aftershocks distribution shifting over time.The aftershock distribution presents spatial inhomogeneity.On both sides of Longbao,the intensity,width and the focal depth of the aftershocks are different.The seismogenic fault of aftershocks of Yushu earthquakes is the northern branch of Garzê-Yushu fault zone,i.e.Yushu-Longbao fault,which dips to northeast with high-angle left-lateral strike-slip.To the northwest of Longbao town,the intensively distributed aftershock group is not only due to Yushu-Longbao fault zone,the more important seismogenesis is that the northwest "weak plane" is nearly vertical to the fault.
引文
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9 JOPENS数据服务系统[DB/OL].http://10.5.202.37:8080/JOPENSCat/login.seam.(JOPENS Data Service[DB/OL].http://10.5.202.37:8080/JOPENSCat/login.seam.
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13中国地震局监测预报司.中国大陆地震序列研究[M].北京:地震出版社,2007.(Department of Monitoring and Prediction of China Earthquake Administration.Research on earthquake sequence of Chinese mainland[M].Beijing:Seismology Press,2007)
14杨卓欣,等.利用流动台网余震监测资料研究玉树Ms7.1地震深部发震构造[R].2011.(Yang ZhuoXin,et al.Research for Yushu earthquake deep seismotectonic using the data recorded by both movable monitoring network in Yushu earthquake zones[R].2011)
2张勇,许力生,陈运泰.2010年4月14日青海玉树地震破裂过程快速反演[J].地震学报,32(3):361-365.(ZhangYong,Xu Lisheng and Chen Yuntai.Fast inversion of rup-ture process for 14 April 2010 Yushu,Qinghai,earthquak[J].Acta Seismologica Sinica,2010,32(3):361-365)
3闻学泽,等.玉树-甘孜断裂的平均滑动速率与近代大地震破裂[J].中国科学(D辑),2003,33:199-208.(WenXueze,et al.Average slip-rate of the Garze-Yushu fault andruptures of the recent large earthquakes[J].Science in Chi-na Series D:Earth Sciences,2003,33:199-208)
4吕坚,等.2010年4月14日青海玉树Ms4.7、Ms7.1、Ms6.3地震震源机制解与发震构造研究[J].地球物理学进展,2011,26(5):1600-1606.(LüJian,et al.Focalmechanisms and seismogenic structure of the Ms4.7,Ms7.1,Ms6.3 Yushu earthquakes of April 14,2010[J].Pro-gress in Geophys,2011,26(5):1 600-1 606)
5刘巧霞,等.玉树Ms7.1地震部分余震重新定位及发震构造分析[J].地球物理学报,2012,55(1):146-154.(Liu Qqiaoxia,et al.Relocation of Yushu Ms7.1 earthquakeaftershocks and discussion on seismogenic structure[J].Chi-nese J Geophys.,2012,55(1):146-154)
6杨光亮,等.类乌齐-玉树-玛多剖面重力异常研究[J].大地测量与地球动力学,2011,(5):1-4.(Yang Guangling,et al.Study on gravity anomaly of profile Riwood-Yushu-Maduo[J].Journal of Geodesy and Geodynamics,2011,(5):1-4)
7祝意青,刘芳,郭树松.2010年玉树Ms7.1地震前的重力变化[J].大地测量与地球动力学,2011,(5):1-4.(ZhuYiqing,Liu Fang and Guo Shusong.Gravtity changes beforeYushu Ms7.1 earthquake,2010[J].Journal of Geodesy andGeodynamics,2011,(5):1-4)
8孙鑫喆,等.2010年玉树地震地表破裂带典型破裂样式及其构造意义[J].地球物理学报,2012,55(1):155-170.(Sun Xinzhe,et al.Surface rupture features of 2010Yushu earthquake and its tectonic implication[J].Chinese JGeophys.,2012,55(1):155-170)
9 JOPENS数据服务系统[DB/OL].http://10.5.202.37:8080/JOPENSCat/login.seam.(JOPENS Data Service[DB/OL].http://10.5.202.37:8080/JOPENSCat/login.seam.
10 Waldhauser F and Ellsworth W L.A double-difference earthquake location algorithm:method and applicationto the Northern Hayward Fault,California[J].Bull Seismol Soc Amer,2000,90(6):1 353-1 368.
11 Waldhauser F and Ellsworth W L.Fault structure and me-chanics of the Hayward Fault,California,from double-difference earthquake locations[J].Geophys Res.,2002,107,2 054,doi:10.1029/2000JB000084.
12中国地震局地球物理勘探中心.玉树地震科考——人工地震宽角反射/折射剖面探测研究报告[R].2011.(Ge-ophysical Exploration Center,CEA.Yushu earthquake sci-entific research:the research report of active source wide Angle reflect/refract profile detecting[R].2011)
13中国地震局监测预报司.中国大陆地震序列研究[M].北京:地震出版社,2007.(Department of Monitoring and Prediction of China Earthquake Administration.Research on earthquake sequence of Chinese mainland[M].Beijing:Seismology Press,2007)
14杨卓欣,等.利用流动台网余震监测资料研究玉树Ms7.1地震深部发震构造[R].2011.(Yang ZhuoXin,et al.Research for Yushu earthquake deep seismotectonic using the data recorded by both movable monitoring network in Yushu earthquake zones[R].2011)
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