隐伏活断层的综合地球物理勘探方法——以青川县城区活断层为例
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摘要
汶川8.0级特大地震,使青川县城区遭受了严重的破坏,并且出现了条带状破坏增高异常现象,灾后的恢复重建工作受到隐伏断裂、山体变形、强烈的余震活动等因素的制约,尤其是通过城区的隐伏活断层,开展地球物理定位工作,查明其展布的位置势在必行。在此次青川县城区活断层定位过程中采用了综合地球物理勘探方法,查明了北东向的平武-青川断裂隐伏段城区内的展布情况,并根据其解译成果进行了探槽的开挖验证,确定了主干断裂及其分支断裂的具体通过位置,为灾后的恢复重建工作提供了科学依据。
Wenchuan 8.0M large earthquake makes Qingchuan city suffer severe damage,and the increased abnormal destruction with banded forms occurred.Post-disaster restoration and reconstruction work has been restricted by buried fault,deformation of the mountain,a series of occurred strong aftershock activities and other factors,in particularly,through buried active faults of the city,the geophysical positioning method to identify the location of fault distribution is imperative.Geophysical exploration methods are used to positioning the locations of Qingchuan active faults,the distribution case of buried faults of the flat NE Pingwu-Qingchuan in the city is identified,the excavating and verifying work of exploratory trench are carried out according to the geophysical interpretation,the locations of the main fault and its branches are identified,and the scientific basis for the post-disaster restoration and reconstruction work is provided.
Wenchuan 8.0M large earthquake makes Qingchuan city suffer severe damage,and the increased abnormal destruction with banded forms occurred.Post-disaster restoration and reconstruction work has been restricted by buried fault,deformation of the mountain,a series of occurred strong aftershock activities and other factors,in particularly,through buried active faults of the city,the geophysical positioning method to identify the location of fault distribution is imperative.Geophysical exploration methods are used to positioning the locations of Qingchuan active faults,the distribution case of buried faults of the flat NE Pingwu-Qingchuan in the city is identified,the excavating and verifying work of exploratory trench are carried out according to the geophysical interpretation,the locations of the main fault and its branches are identified,and the scientific basis for the post-disaster restoration and reconstruction work is provided.
引文
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[2]周荣军,黄润秋,雷建成.四川汶川8.0级地震地表破裂与震害特点[J]岩石力学与工程学报,2008,27(11):2174-2183.ZHOURongjun,HUANG Runqiu,LEI Jiancheng.Surface rupture and hazard characteristscs of wenchuan earthquake with magnitude 8.0 in Si-chuan province[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(11):2174-2183.
[3]方盛明,张先康,刘保金.探测大城市活断层的地球物理方法[J].地震地质,2002,24(4):606-613.FANG Shengming,ZHANG Xiankang,LIU Baojin.Geophysical methods for the exporation of urban active faults[J].Seismology and Geology,2002,24(4):606-613.
[4]刘保金,张先康,方盛明.城市活断层探测的高分辨率浅层地震数据采集技术[J].地震地质,2002,24(4):524-532.LIU Baojin,ZHANG Xiankang,FANG Shengming.Acquisition technique of high-resolution shallowseismic data for surveying of urban active faults[J].Seismology and Geology,2002,24(4):524-532.
[5]徐朝繁,张先康,刘宝金.高分辨折射地震资料处理方法及其应用[J].地球物理学进展,2005,20(4):1052-1058.XUChaofan,ZHANG Xiankang,LIUBaojin.Processing method for high resolution refraction seismic data and its application[J].Progress in Geo-physics,2005,20(4):1052-1058.
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[7]Lecomte I,Gjoystal H,et al.Improving modeling and inversion in refraction seismic with a first-order Eikonal solver[J].Geophysical Prospecting,2002,48:437-454.
[8]Hole J A.Nonlinear high-resolution three-dimensional seismic travel time tomography[J].Journal of Geophysics Research,1992,135:6553-6562.
[9]青川县浅层地震勘探报告[R].中国地震局地球物理勘探中心郑州应用技术研究所,2009.The report of shallowseismic exploration of qingchuan[R].Research Center of Exploration Geophysics,China Earthquake Administroation,Zheng-zhou Institute of Applied Jechnology,2009.
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