华北近十年来水平运动动态与地震活动危险区的讨论
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摘要
根据华北地区 1 999和 2 0 0 1年两期高精度 GPS观测结果 ,通过与 1 992、1 995、1 996和1 999年这几期资料的比较 ,发现近两年的运动与前有所不同 ,主要表现为 :1阴山单元和鄂尔多斯单元之间显示为压性运动的性质 ,但比较微弱 ;它们之间的边界带上似乎有左旋走滑运动 ,但从整体上看并不显著。2晋冀鲁单元和燕山单元的整体活动性不如以前 ,各单元内部存在着较明显的差异运动 ,燕山单元和晋冀鲁单元的北部存在着比较显著的东西向挤压 ,北京地区则表现为南北向挤压。 3晋冀鲁单元南部与胶辽鲁苏单元的南部的趋势活动呈张性 ,优势运动方向为东南。这样的结果可能表明 :华北目前存在着应力扰动行为 ,大同与天津之间的区域是受其影响最大的地区 ,该区有可能成为未来几年中强地震活动的一个主体地区
compared the GPS data observed in 1999 and 2001 with the data observde in 1992,1995,1996 and 1999,the crustal movement is found different from its previous character,which behaves as the following:①there is a weaker compressive motion with left-lateral strike slip between Yinshan unit and Ordos unit,but not obvious;②the motion of Jinjilu unit and Yanshan unit are not the same as before,but there is obvious differential movement in the interior of the units,which is EW extrusion in northern part of the units,and NS extrusion in Beijing area;③the deformation of the southern part of Jinjilu unit and Jiaoliaolu unit is extensional with a dominant direction of SE.These results show that there is a stress disturbing in North China currently,and the area between Datong and Tianjin is the most influenced region,which would be an main zone of medium and strong earthquakes in a few years.
compared the GPS data observed in 1999 and 2001 with the data observde in 1992,1995,1996 and 1999,the crustal movement is found different from its previous character,which behaves as the following:①there is a weaker compressive motion with left-lateral strike slip between Yinshan unit and Ordos unit,but not obvious;②the motion of Jinjilu unit and Yanshan unit are not the same as before,but there is obvious differential movement in the interior of the units,which is EW extrusion in northern part of the units,and NS extrusion in Beijing area;③the deformation of the southern part of Jinjilu unit and Jiaoliaolu unit is extensional with a dominant direction of SE.These results show that there is a stress disturbing in North China currently,and the area between Datong and Tianjin is the most influenced region,which would be an main zone of medium and strong earthquakes in a few years.
引文
[1] 汪一鹏,邓起东,等.华北断块新生代.现代地质构造特征.华北断块区的形成与发展[M].北京:科学出版社,1980,192-205.
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[4] 杨国华,韩月萍,张凤兰.使用GPS复测资料确定华北地区不同活动性质单元及活动方式[J].地震学报,2001,23(1):1-10.
[5] SHEN Zhen-Kang,ZHAO Cheng-Kun,LIYan-Xing,et al.ContemporaryCrustalDeformation inEastAsiaConstrained byGlobalPositioningSystemMeasurements[M].J.Geophys.Res.,2000,105,5721-5734.
[6] 杨国华,韩月萍,谢觉民等.首都圈地壳垂直形变与未来强震的活动[J],地震,2002,22(3):27-32.
[7] 杨国华,王敏,韩月萍,等.山西断裂带活动趋势与动态特征[J],中国地震,2002,18(2):148-156.
[8] 杨国华,赵承坤,韩月萍.利用GPS技术监测山西断陷带水平运动[J],地震学报,2000,22(5):465-471.
[2] 丁国瑜主编.中国岩石圈动力学概论[M].北京:地震出版社,1991,492-502.
[3] 杨国华,谢觉民,韩月萍.华北主要构造单元及边界带现今水平形变与运动机制[J].地球物理学报,2001,44(5),645-653.
[4] 杨国华,韩月萍,张凤兰.使用GPS复测资料确定华北地区不同活动性质单元及活动方式[J].地震学报,2001,23(1):1-10.
[5] SHEN Zhen-Kang,ZHAO Cheng-Kun,LIYan-Xing,et al.ContemporaryCrustalDeformation inEastAsiaConstrained byGlobalPositioningSystemMeasurements[M].J.Geophys.Res.,2000,105,5721-5734.
[6] 杨国华,韩月萍,谢觉民等.首都圈地壳垂直形变与未来强震的活动[J],地震,2002,22(3):27-32.
[7] 杨国华,王敏,韩月萍,等.山西断裂带活动趋势与动态特征[J],中国地震,2002,18(2):148-156.
[8] 杨国华,赵承坤,韩月萍.利用GPS技术监测山西断陷带水平运动[J],地震学报,2000,22(5):465-471.
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