南北地震带区域形变异常特征与地震关系研究
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摘要
利用南北地震带及附近地区20世纪70年代以来的区域水准网和90年代以来的GPS监测网资料,结合地质构造和监测区发生的多次6级左右及以上震例,分析了震前区域性形变场异常的基本特征。进而根据资料支持程度,分别以GPS、区域水准观测位移为地表约束,以“973”项目活动地块划分结果为地质依据,进行非震负位错模型反演计算,研究了数值模拟结果反映的活动块体和边界断裂构造变形状态与地震的关系。在此基础上,定性与定量相结合分析研究了强震前区域性水平、垂直构造形变异常特征及可能的机理,初步总结了基于区域水准、GPS观测与数值模拟的强震前区域构造形变异常的一些判据。
Using the data of regional leveling network since 1970s and GPS monitoring network since 1990s along the South-North seismic belt and vicinity,combining with geologic structure and recently occurred earthquakes(M_S≥6.0) in this monitoring area,the basic characteristics of regional deformation anomaly before earthquakes are analyzed.Then,depending on the supporting degree of data,under constraint of GPS or regional leveling observation displacement,and according to division of active massif of "973" project as geological basis,the inversion computation of aseismic negative dislocation model is carried out.The relation between deformation state of active massif and boundary fault structure reflected by numerical simulation results and seismicity is studied.Based on this,the anomaly characteristics and possible mechanism of regional horizontal and vertical tectonic deformation are qualitatively and horizontal and vertical tectonic deformation are qualitatively and quantitive studied.Some criteria of regional tectonic deformation anomalies before strong earthquakes are preliminary summarized on the basis of regional leveling,GPS observation and numerical simulation.
Using the data of regional leveling network since 1970s and GPS monitoring network since 1990s along the South-North seismic belt and vicinity,combining with geologic structure and recently occurred earthquakes(M_S≥6.0) in this monitoring area,the basic characteristics of regional deformation anomaly before earthquakes are analyzed.Then,depending on the supporting degree of data,under constraint of GPS or regional leveling observation displacement,and according to division of active massif of "973" project as geological basis,the inversion computation of aseismic negative dislocation model is carried out.The relation between deformation state of active massif and boundary fault structure reflected by numerical simulation results and seismicity is studied.Based on this,the anomaly characteristics and possible mechanism of regional horizontal and vertical tectonic deformation are qualitatively and horizontal and vertical tectonic deformation are qualitatively and quantitive studied.Some criteria of regional tectonic deformation anomalies before strong earthquakes are preliminary summarized on the basis of regional leveling,GPS observation and numerical simulation.
引文
[1]丁国瑜,卢演俦.中国岩石圈动力学概论[M].北京:地震出版社,1991.
[2]江在森,张希,崔笃信,等.青藏块体东北缘近期水平运动与变形[J].地球物理学报,2001,44(5):636-644.
[3]申重阳,张希,吴云,等.川滇菱形块体主要边界运动模型的GPS数据反演分析[J].地球物理学报,2002,45(3):475-484.
[4]顾国华,符养,王武星.利用GPS观测结果对我国地壳水平形变强度的分析[J].地震,2004,24(2):1-6.
[5]王双绪,张希,张四新,等.强震中期阶段区域性形变异常的共性特征及其机制以青藏块体东北部为例[J].地震,2004,24(4):73-79.
[6]江在森,丁平,王双绪,等.中国西部大地形变监测与地震预测[M].北京:地震出版社,2001.
[7]巩守文.共和6.9级地震垂直形变场位错模式及其演化特征的研究[J].地震学报,1993,15(3):289-295.
[8]王双绪,张希,张晓亮.昆仑MS8.1地震前青藏块体北、东缘水平运动变形的关联特征[J].中国地震,2005,21(1):41-49.
[9]Matsu′ura M,Jackson D D,Cheng A.Dislocation model for aseismic crustal deformation at Hol-lister[J].California J of Geophysical Research,1986,91(B12):12 661-12 674.
[10]何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638-645.
[11]伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8-14.
[12]张希,江在森,王琪,等.青藏高原北部地区构造变形特征及与强震关系[J].地球物理学进展,2004,19(2):363-371.
[13]张希,江在森,王双绪,等.川滇地区近期地壳水平运动特征与强震关系研究[J].大地测量与地球动力学,2003,23(3):35-41.
[14]张希,张四新,王双绪,等.北祁连—河西地区强震地点预测[J].大地测量与地球动力学,2005,25(1):40-46.
[15]虢顺民,江在森,张崇立.青藏高原东北缘晚第四纪块体划分与运动态势研究[J].地震地质,2000,22(3):219-230.
[2]江在森,张希,崔笃信,等.青藏块体东北缘近期水平运动与变形[J].地球物理学报,2001,44(5):636-644.
[3]申重阳,张希,吴云,等.川滇菱形块体主要边界运动模型的GPS数据反演分析[J].地球物理学报,2002,45(3):475-484.
[4]顾国华,符养,王武星.利用GPS观测结果对我国地壳水平形变强度的分析[J].地震,2004,24(2):1-6.
[5]王双绪,张希,张四新,等.强震中期阶段区域性形变异常的共性特征及其机制以青藏块体东北部为例[J].地震,2004,24(4):73-79.
[6]江在森,丁平,王双绪,等.中国西部大地形变监测与地震预测[M].北京:地震出版社,2001.
[7]巩守文.共和6.9级地震垂直形变场位错模式及其演化特征的研究[J].地震学报,1993,15(3):289-295.
[8]王双绪,张希,张晓亮.昆仑MS8.1地震前青藏块体北、东缘水平运动变形的关联特征[J].中国地震,2005,21(1):41-49.
[9]Matsu′ura M,Jackson D D,Cheng A.Dislocation model for aseismic crustal deformation at Hol-lister[J].California J of Geophysical Research,1986,91(B12):12 661-12 674.
[10]何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638-645.
[11]伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8-14.
[12]张希,江在森,王琪,等.青藏高原北部地区构造变形特征及与强震关系[J].地球物理学进展,2004,19(2):363-371.
[13]张希,江在森,王双绪,等.川滇地区近期地壳水平运动特征与强震关系研究[J].大地测量与地球动力学,2003,23(3):35-41.
[14]张希,张四新,王双绪,等.北祁连—河西地区强震地点预测[J].大地测量与地球动力学,2005,25(1):40-46.
[15]虢顺民,江在森,张崇立.青藏高原东北缘晚第四纪块体划分与运动态势研究[J].地震地质,2000,22(3):219-230.
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