2013年湖北巴东Ms5.1地震成因机制探讨
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摘要
巴东Ms5.1地震是三峡水库蓄水后发生的最大震级的地震,本文从多角度对此次地震的成因机制进行了探讨。使用VELEST程序对巴东Ms5.1地震序列进行了重新定位,结果显示,地震序列呈近EW向分布。根据小震丛集性原则,使用305次余震的精确定位结果对地震发震断层面参数进行反演,得到巴东Ms5.1地震断层面的走向、倾向和倾角分别为265.5°,85°和-120.7°,并对其构造环境进行了分析。
On December 16, 2013, a magnitude 5. 1 earthquake, the largest earthquake recorded since impoundment,occurred in Badong County. For a better understanding of the seismic activities in this area,we analyzed the seismogenic structure combining with focal mechanism solution,relocation of the aftershock sequence and the geologic settings in the region. Precise earthquake relocation shows that the earthquake sequence is distributed along NEE direction. According to the principle of small earthquakes cluster,we inversed the parameters of fault plane to obtain the strike,dip and rake angles of fault plane which are 265. 5°,85° and-120. 7°respectively. Then we analyzed the tectonic environment of Badong MS5. 1 earthquake.
On December 16, 2013, a magnitude 5. 1 earthquake, the largest earthquake recorded since impoundment,occurred in Badong County. For a better understanding of the seismic activities in this area,we analyzed the seismogenic structure combining with focal mechanism solution,relocation of the aftershock sequence and the geologic settings in the region. Precise earthquake relocation shows that the earthquake sequence is distributed along NEE direction. According to the principle of small earthquakes cluster,we inversed the parameters of fault plane to obtain the strike,dip and rake angles of fault plane which are 265. 5°,85° and-120. 7°respectively. Then we analyzed the tectonic environment of Badong MS5. 1 earthquake.
引文
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[18]赵晓燕,武晔,高方平,等.根据余震资料求解2003年伽师M_S6.8地震断层面的研究[J].地震,2013,03:133-139.
[19]王墩,姚运生,薛军蓉,等.三峡水库重点监视区蓄水前后震源机制研究[J].大地测量与地球动力学,2007,05:103-107.
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[21]张丽芬,姚运生,李井冈,等.三峡库区构造和塌陷地震的拐角频率特征[J].大地测量与地球动力学,2013,02:27-30,40.
[22]陈蜀俊,姚运生,吴建超,等.巴东Ms5.1地震—一种新的水库地震类型[J].大地测量与地球动力学,2014,03:1-5.
[2]李细光,姚运生,秦小军.马鹿池断裂与官渡口断裂的成因关联分析[J].大地测量与地球动力学,2004,02:42-47.
[3]Kissling,E.,Ellsworth W.L.,Eberhart-phillips D.,et al.,1994.Initial Reference Models in Local Earthquake Tomography.J.Geophys.Res.,99(B10):19635-19646.
[4]Musumeci,C.,Di Grazia G.,Gresta S.Minimum 1-D velocity model in southeastern Sicily(Italy)from local earthquake data:an improvement in location accuracy[J].Journal of Seismology.2003,7(4):469-478.
[5]Midzi,V.,Saunders I.,Brandt M.B.C.,et al.1-D Velocity Model for Use by the SANSN in Earthquake Location[J].Seismological Research Letters.2010,81(3):460-466.
[6]Mohamed,H.and Miyashita K.,One-dimensional Pwave velocity structure in the northern Red Sea area,deduced from travel time data[J].Earth Planets and Space.2001,53(7):695-702.
[7]于湘伟,陈运泰,王培德.京津唐地区中上地壳三维P波速度结构[J].地震学报,2003,01:1-14.
[8]于湘伟,陈运泰,张怀.京津唐地区地壳三维P波速度结构与地震活动性分析[J].地球物理学报,2010,53(8):1817-1828.
[9]王伟君,陈凌,陈棋福,等.2003年大姚地震震中区的速度和衰减结构[J].地球物理学报,2007,03:770-779.
[10]李志伟,胥颐,郝天珧,等.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,2006,03:797-804.
[11]Kissling E,et al.VELEST User’s Guide-Short Introduction[R].Institute of geophysics and Swiss seismological service,ETH,Zurich.1995.
[12]陈学波.长江三峡工程坝区及外围深部构造特征研究[M].北京:地震出版社,1994.
[13]廖武林,姚运生,丁志峰,等.三峡地区P波速度层析成像研究[J].大地测量与地球动力学,2007,03:80-84.
[14]赵旭,李强,蔡晋安.三峡库首区最小一维速度模型研究[J].大地测量与地球动力学,2007,S1:1-7.
[15]王鸣,王培德.1989年10月18日大同—阳高地震的震源机制和发震构造[J].地震学报,1992,04:407-415+525.
[16]万永革,沈正康,刁桂苓,等.利用小震分布和区域应力场确定大震断层面参数方法及其在唐山地震序列中的应用[J].地球物理学报,2008,03:793-804.
[17]杨超群,孟凡顺,万永革.采用精确定位小震资料反演伽师地震断层面[J].地球物理学进展,2013,06:2865-2871.
[18]赵晓燕,武晔,高方平,等.根据余震资料求解2003年伽师M_S6.8地震断层面的研究[J].地震,2013,03:133-139.
[19]王墩,姚运生,薛军蓉,等.三峡水库重点监视区蓄水前后震源机制研究[J].大地测量与地球动力学,2007,05:103-107.
[20]湖北省地震局.湖北巴东Ms5.1地震分析报告[R].2013.
[21]张丽芬,姚运生,李井冈,等.三峡库区构造和塌陷地震的拐角频率特征[J].大地测量与地球动力学,2013,02:27-30,40.
[22]陈蜀俊,姚运生,吴建超,等.巴东Ms5.1地震—一种新的水库地震类型[J].大地测量与地球动力学,2014,03:1-5.