渭河盆地现今地壳水平形变特征及区域构造活动性
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摘要
根据渭河盆地地质构造的特点,建立了二维有限元模型,并基于渭河盆地2001~2007年GPS观测成果,数值模拟获得了渭河盆地现今地壳应力应变场特征,结合区域近期地震活动性特点,探讨了地壳形变特征与地震活动性的关系。结果表明,渭河盆地现今构造应力场仍以NNW-SSE向拉张应力为主;盆地最大剪应变率高值区与盆地现代小地震条带有很好的空间对应关系;泾阳-咸阳-西安-临潼-三原地区属于渭河盆地内地壳薄弱带,易于盆地伸展和地震孕育。
In this paper,two-dimensional finite model of elastic mechanics is established according to the geological structure features of Weihe Basin.And the author obtains the stress and strain characteristics by the 2001~2007 GPS data in this region.In the end combine with the characteristic of recently seismic activity in Weihe basin,The relation between crustal deformation characteristics and the seismic activity is also discussed.The results show that current tectonic stress field of this basin presents tensile stress with NNW-SSE direction.The spatial distribution of maximum shear strain rate in Weihe basin has a very good correlation with small modern seismic belt.The region of Jingyang-Xianyang-Xi'an-Lintong-Sanyuan belongs to the weak zone in the crust of Weihe Basin which is apt to basin extension and earthquake preparation.
In this paper,two-dimensional finite model of elastic mechanics is established according to the geological structure features of Weihe Basin.And the author obtains the stress and strain characteristics by the 2001~2007 GPS data in this region.In the end combine with the characteristic of recently seismic activity in Weihe basin,The relation between crustal deformation characteristics and the seismic activity is also discussed.The results show that current tectonic stress field of this basin presents tensile stress with NNW-SSE direction.The spatial distribution of maximum shear strain rate in Weihe basin has a very good correlation with small modern seismic belt.The region of Jingyang-Xianyang-Xi'an-Lintong-Sanyuan belongs to the weak zone in the crust of Weihe Basin which is apt to basin extension and earthquake preparation.
引文
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[3]王卫东.泾阳4.8级地震的构造背景[J].西北地震学报,2002,24(2):541-941
[4]方永安.陕西地震活动规律与活动断裂的关系[J].陕西地质,1997,15(1):72-83
[5]甘卫军,沈正康,张培震,等.青藏高原地壳水平差异运动的GPS观测研究[J].大地测量与地球动力学,2004,24(1):29-35
[6]熊熊,刘孙君,许厚泽.青藏高原地壳东-西向拉张及力学机制[J].武汉大学学报.信息科学版,2003,28(特刊):150-154
[7]阮爱国,李清河.地壳介质各向异性研究状况、存在问题及进一步研究思路[J].地震地磁观测与研究,1999,20(3):1-12
[8]张冬菊.青藏东北缘地壳形变应力应变场分析与构造活动性研究[D].西安:长安大学,2006
[9]Clark M K,Royden L H.Topographic Ooze:Buildingthe Eastern Margin of Tibet by Lower Crustal Flow[J].Geology(Boulder),2000,28(8):703-706
[10]England P C,Houseman G A.Extension DuringContinental Convergence with Special Reference to theTibetan Plateau[J].J Geophys Res,1989,94(17):561-597
[11]刘经南,施闯,许才军,等.利用局域复测GPS网研究中国大陆块体现今地壳运动速度场[J].武汉大学学报.信息科学版,2001,26(3):189-195
[12]刘经南,姚宜斌,施闯.中国地壳运动整体速度场模型的建立方法研究[J].武汉大学学报.信息科学版,2002,27(4):331-336
[13]彭建兵,张俊,苏生瑞,等.渭河盆地活动断裂与地质灾害[M].西安:西北大学出版社,1992
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