近年来华北南部地区地震活动增强的力学背景分析
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摘要
依据青藏高原东北缘与秦岭大地构造格局相关联的地质构造背景,青藏高原物质东流和"稳定"块体的阻挡是华北南部地区构造活动的主要动力来源之一的基本认识,分析了青藏高原东北缘4次8级地震前华北南部地区地震活动的基本特征。8级地震震中区附近地震活动异常变化不明显,但华北南部地区地震异常活跃,其异常活跃过程与青藏高原东北缘强震的孕育与发生存在明显的相关性,具有一定的异地震情指示意义。
The geological tectonic structure of northeast margin of the Tibetan Plateau correlates with that of Qinling-Dabashan region.The out flow of material in Tibetan Plateau lithosphere and regional structures interaction is the major tectonic stress acting on plate of the south part of North China.Based on these understandings,the seismic activity in south part of north China before 4 large earthquakes(M≥8) occurred on northeast margin of the Tibetan Plateau is analyzed.Seismic activity abnormity close to large earthquake epicenters is not obvious,but seismic activity in south part of north china is distinct.The process of seismic activity abnormity in south part of north china is visibly correlative with the strong earthquake brewing and occurring in northeast part area of Tibetan Plateau edge,The seismic situation display in outside areas give us some new idea on estimation the strong earthquake situation in northeast part area of Tibetan Plateau edge.
The geological tectonic structure of northeast margin of the Tibetan Plateau correlates with that of Qinling-Dabashan region.The out flow of material in Tibetan Plateau lithosphere and regional structures interaction is the major tectonic stress acting on plate of the south part of North China.Based on these understandings,the seismic activity in south part of north China before 4 large earthquakes(M≥8) occurred on northeast margin of the Tibetan Plateau is analyzed.Seismic activity abnormity close to large earthquake epicenters is not obvious,but seismic activity in south part of north china is distinct.The process of seismic activity abnormity in south part of north china is visibly correlative with the strong earthquake brewing and occurring in northeast part area of Tibetan Plateau edge,The seismic situation display in outside areas give us some new idea on estimation the strong earthquake situation in northeast part area of Tibetan Plateau edge.
引文
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[15]张跃刚,等.从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,26(1):36-41.
[2]滕吉文,张中杰,王光杰,等.喜马拉雅碰撞造山带的深层动力过程与陆─陆碰撞新模型[J].地球物理学报,1999,42(4):481-493.
[3]曾融生,丁志峰,吴庆举.喜马拉雅—祁连山地壳构造与大陆-大陆碰撞过程[J].地球物理学报,1998,41(1):49-60.
[4]张培震,王琪.中国大陆现今地壳运动和构造变形—速度场与活动板块.现代地壳运动与地球动力学研究[C].北京:地震出版社,2001:21-35.
[5]Brace W.F.and Kohlstedt D.L..Limits on lithospheric stress imposed by laboratory experiment[J].J.Geophys.Res.,1980,74:6248-6252.
[6]王绳祖,张四昌,田勤俭,等.大陆动力学-网状塑性流动与多级构造变形[M].北京:地震出版社,2000.
[7]Tapponnier P.and Molnar P..Active faulting and Cenozoic tectonics of China[J].J.Geophys.Res.,1977,105:5721-5734.
[8]Molnar P.and Gipson J.M..A bound on the rheology of continental lithosphere using very long baseline interferometry:the velocity of south Chi-na with respect to Eurasia[J].J.Geophys Res.,1996,101:545-553.
[9]肖兰喜,朱元清,陶九庆.岩石圈流变强度与中国大陆构造运动关系的探讨[J].西北地震学报,2003,25(4):304-311.
[10]刘增乾,徐宪,潘桂棠,等.青藏高原大地构造与形成演化[M].北京:地质出版社,1990.
[11]叶文华,邓起东,尤惠川.强震活动迁移性图像的研究-以华北地震区为例[J].华北地震科学,1994,12(1):1-8.
[12]周伟,杨国华,华彩虹.通过分区分析预测华北地震危险区[J].华北地震科学,2001,19(4):27-33.
[13]张跃刚,胡新康.华北地区块体及其边界的相对运动[J].大地测量与地球动力学,2005,25(1):47-50.
[14]张跃刚,等.华北地区地壳水平运动演化特征研究[J].大地测量与地球动力学,2004,24(1):56-62.
[15]张跃刚,等.从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,26(1):36-41.
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