利用密集临时地震台网资料研究唐山地震区三维速度结构
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摘要
利用地震层析成像方法处理唐山临时地震台网资料,得到该地震区中上地壳的速度图像。图像表明:上地壳速度在唐山断裂带两侧差异明显,速度结构特征是北西侧为高速区,东南侧为低速区,唐山断裂带为速度陡变带;中地壳速度表现为在研究区中部近东西向展布的低速带,其位置和方向与近东西向的丰台-野鸡坨断裂有对应关系;唐山震源区无论是在深度方向还是水平方向都存在地壳速度陡变。
Seismic tomography is used for processing the data of temporary seismostations networks in Tangshan region,and the velocity images of upper and mid crust in this earthquake region are obtained.The results show that,in the upper crust image,the velocity of two sides between the Tangshan fault zone are different,where the northwest side is high velocity zone while the southeast side is low and the Tangshan fault is belt with sharp velocity variety.Besides in the mid crust velocity image,it shows that there is low velocity belt near EW strike in the centre of the studied area,and its location and strike are corresponding with the Fengtai-Yejituo fault which is near EW strike and in Tangshan epicenter region,along both of the depth and horizon,sharp velocity variety in crust exsits too.
Seismic tomography is used for processing the data of temporary seismostations networks in Tangshan region,and the velocity images of upper and mid crust in this earthquake region are obtained.The results show that,in the upper crust image,the velocity of two sides between the Tangshan fault zone are different,where the northwest side is high velocity zone while the southeast side is low and the Tangshan fault is belt with sharp velocity variety.Besides in the mid crust velocity image,it shows that there is low velocity belt near EW strike in the centre of the studied area,and its location and strike are corresponding with the Fengtai-Yejituo fault which is near EW strike and in Tangshan epicenter region,along both of the depth and horizon,sharp velocity variety in crust exsits too.
引文
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7郭慧,江娃利,谢新生.钻孔与探槽揭示1976年河北唐山Ms7.8地震发震构造晚第四纪强震活动[J].中国科学(地球科学),2011,41(7):1009-1028.(Guo Hui,Jiang Wali and Xie Xinsheng.Late-Quaternary strong earth-quakes on the seismogenic fault of 1976 Ms7.8 Tangshanearthquake,Hebei,as revealed by drilling and trenching[J].Sci China Earth Sci.,2011,doi:10.1007/s11430-011-4218-x.8万永革,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,2008,51(3):793-804.(Wan Yongge,et a1.An al-gorithm of fault parameter determination using distribution ofsmall earthquakes and parameters of regional stress field andits application to Tangshan earthquake sequence[J].ChineseJ Geophys.,2008,51(3):793-804)
9赖晓玲,等.2006年唐山震源区临时地震台网微震观测初步结果[J].大地测量与地球动力学,2008,(1):7-
10.(Lai Xiaoling,et al.Preliminary results of microearth-quake observation by temporary seismostation networks inTangshan region in 2006[J].Journal of Geodesy and Geo-dynamics,2008,(1):7-10)
10赖晓玲,等.唐山地震区震源参数图像分析[J].大地测量与地球动力学,2009,(6):32-34.(Lai Xiaoling,et al.Pattern analyses of hypocentral parameters in Tangshanearthquake region[J].Journal of Geodesy and Geodynam-ics,2009,(6):32-34)
11陈尚斌,等.开滦唐山矿逆冲推覆构造及其控煤作用[J].煤田地质与勘探,2011,39(2):7-12.(ChenShangbin,et al.Nappe structure characteristics and coal-con-trolling action of Tangshan mine in Kailuan[J].Coal Geolo-gy&Exploration,2011,39(2):7-12)
2赖晓玲,等.张北地震区三维构造特征[J].地学前缘,2002,9(4):383-388.(Lai Xiaoling,et al.3-D structuralfeature in Zhangbei earthquake region[J].Earth ScienceFrontiers,2002,9(4):383-388)
3张四昌,刁桂苓.唐山地震序列的构造过程[J].中国地震,1992,8(2):73-80.(Zhang Sichang and Diao Guiling.The tectonic process of the Tangshan earthquake sequence[J].Earthquake Research in China,1992,8(2):73-80)
4李建华,等.1976年唐山地震发震断裂的活动性研究[J].地震地质,1998,20(1):27-33.(Li Jianhua,et al.A study on activity of the seismogenic fault for the Tangshanearthquake of 1976[J].Seismology and Geology,1998,20(1):27-33)
5尤惠川,等.唐山地震深浅构造关系研究[J].地震地质,2002,24(2):571-582.(You Huichuan,et al.Study on therelationship between shallow and deep structures in the 1976Tangshan earthquake area[J].Seismology and Geology,2002,24(2):571-582)
6邱泽华,马瑾,刘国玺.新发现的唐山地震大断层[J].地震地质,2005,27(4):669-677.(Qiu Zehua,Ma Jinand Liu Guoxi.Late discovery of the great fault of the Tangs-han earthquake[J].Seismology and Geology,2005,27(4):669-677)
7郭慧,江娃利,谢新生.钻孔与探槽揭示1976年河北唐山Ms7.8地震发震构造晚第四纪强震活动[J].中国科学(地球科学),2011,41(7):1009-1028.(Guo Hui,Jiang Wali and Xie Xinsheng.Late-Quaternary strong earth-quakes on the seismogenic fault of 1976 Ms7.8 Tangshanearthquake,Hebei,as revealed by drilling and trenching[J].Sci China Earth Sci.,2011,doi:10.1007/s11430-011-4218-x.8万永革,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,2008,51(3):793-804.(Wan Yongge,et a1.An al-gorithm of fault parameter determination using distribution ofsmall earthquakes and parameters of regional stress field andits application to Tangshan earthquake sequence[J].ChineseJ Geophys.,2008,51(3):793-804)
9赖晓玲,等.2006年唐山震源区临时地震台网微震观测初步结果[J].大地测量与地球动力学,2008,(1):7-
10.(Lai Xiaoling,et al.Preliminary results of microearth-quake observation by temporary seismostation networks inTangshan region in 2006[J].Journal of Geodesy and Geo-dynamics,2008,(1):7-10)
10赖晓玲,等.唐山地震区震源参数图像分析[J].大地测量与地球动力学,2009,(6):32-34.(Lai Xiaoling,et al.Pattern analyses of hypocentral parameters in Tangshanearthquake region[J].Journal of Geodesy and Geodynam-ics,2009,(6):32-34)
11陈尚斌,等.开滦唐山矿逆冲推覆构造及其控煤作用[J].煤田地质与勘探,2011,39(2):7-12.(ChenShangbin,et al.Nappe structure characteristics and coal-con-trolling action of Tangshan mine in Kailuan[J].Coal Geolo-gy&Exploration,2011,39(2):7-12)
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