三峡重庆库区深部地球物理特征与断裂构造
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摘要
为了深入研究三峡重庆库区岩石圈动力学特征及其对断裂构造活动的控制和影响,并为之提供基础资料,为三峡重庆库区地震、地质灾害的监测与防治提供基础依据,在已有地球物理资料的基础上,从综合地球物理研究角度出发,通过实测地震测线资料的再解释,采用新的处理技术方法,对本区的东西向主剖面和南北向支测线的地震测深资料进行二维射线追踪处理、Pg波成像;选用场分离技术、位移数字成像技术重新处理了重力和航磁资料,通过联合反演来建立深部二维构造剖面,对剖面所揭示的基底构造特征和地壳结构特征、主要断裂构造特征以及莫霍面的起伏特征进行了精细分析和细致研究,从地球物理平面场特征出发建立了岩石圈构造三维框架。研究结果表明,这样的研究思路准确、方法得当,结论可靠;沿该剖面,把可解译的断裂分为Ⅲ级:Ⅰ级为超岩石圈断裂;Ⅱ级为壳断裂;Ⅲ级为盖层断裂。依据地球物理特征,准确揭示了库区的断裂构造特征,达到了预期效果。
For the purpose of providing fundamental data to study the lithosphere dynamic characteristics and the controlling or influence on rupture activity, monitoring and preventing the geological disaster and earthquake, this paper processes the practical seismic data includeing west-east and north-south sections. Selects separating field and displacing digital imaging to process the gravity and magnetic data, analyzes the earth's crust structure and main rupture as well as Moho fluctuating. The 2-D structure section was achieved through joint inversion. The results indicate that the strategy is appropriate and the results are reliable. Along the main section. The interpretable rupture can be classified into three suits, first class (Ⅰ) is super lithosphere rupture that cuts deeply to up mantal, second class (Ⅱ) is lithosphere rupture that exists in the Earth crust, third class (Ⅲ) is rupture in covering layer (including fundus rupture). According to geophysical features. The rupture structure characteristics can be accurately got, and the results agree with the real situation quite well.
For the purpose of providing fundamental data to study the lithosphere dynamic characteristics and the controlling or influence on rupture activity, monitoring and preventing the geological disaster and earthquake, this paper processes the practical seismic data includeing west-east and north-south sections. Selects separating field and displacing digital imaging to process the gravity and magnetic data, analyzes the earth's crust structure and main rupture as well as Moho fluctuating. The 2-D structure section was achieved through joint inversion. The results indicate that the strategy is appropriate and the results are reliable. Along the main section. The interpretable rupture can be classified into three suits, first class (Ⅰ) is super lithosphere rupture that cuts deeply to up mantal, second class (Ⅱ) is lithosphere rupture that exists in the Earth crust, third class (Ⅲ) is rupture in covering layer (including fundus rupture). According to geophysical features. The rupture structure characteristics can be accurately got, and the results agree with the real situation quite well.
引文
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[3]马杏垣.中国岩石圈动力学纲要[M].北京:地震出版社,1987.
[4]陈学波,李清河.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.
[5]孙若昧,刘福田,刘建华.四川地区的地震层析成像[J].地球物理学报,1991,34(6):708~716.
[6]崔作舟,陈纪平,吴苓.花石峡—邵阳深部地壳的结构和构造[M].北京:地质出版社,1996.
[7]孙鹏远,赵文津.广角反射资料的处理软件[J].物探与化探,2001,25(2):0156~0160.
[8]杨文采.地球物理反演和地震层析成像[M].北京:地质出版社,1989.
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[12]湖南省地质矿产局.湖南省区域地质志[M].北京:地质出版社,1988.
[13]张森琦,王秉璋,王瑾,等.西藏风底斯B型山链南缘松多群的构成及其变质变形特征[J].西安工程学院学报,2000,22(3):5~10.
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