山西断陷带的近期位移和应变率特征
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摘要
根据山西GPS局域网观测资料计算的应变位移场和主应变率结果,研究山西断陷带内各个盆地的小尺度形变和应变,以及山西断陷带的整体变化。同时利用网络工程区域网的观测资料计算了在鄂尔多斯块体和太行山块体相互作用下,山西断陷带上产生的差异活动和应变率,这是空间大尺度的变化。不同尺度的应变场和位移场存在着显著差别,它们在地震预测分析中的含义也不同。中小地震分布的随机性较大,与空间小尺度的形变应变有关联,大震主要发生在块体边界带上,与块体的整体运动有关,所以,空间小尺度的形变应变场是评估中小地震活动的依据,块体间的运动和应变场是评估大震活动的依据。2006—2009年的应变显示,大同盆地和忻代盆地"南压北张",太原盆地主应变率"内小外大",临汾盆地"北压南张"。各个盆地的水平运动都具有张扭或压扭特征。大尺度变化说明山西断陷带存在一定的应变积累。
On the basis of the results of the strain displacement field and the principal strain rate calculated from the data observed from Shanxi GPS local area net,the small-scale deformation and strain of the various basins are researched,as well as the overall changes of Shanxi fault subsidence zone.Meanwhile,from the observational data of the area network of network engineering,the differential activities and the strain rate resulted from the interaction of the Ordos block with the Taihang Mountains block,within Shanxi fault subsidence zone are calculated,which is a spatial large-scale change.There are significant differences in different scales of strain field and displacement field,which are also different in the implications of earthquake prediction.Small and moderate earthquakes are more random,which are associated with the spatial small-scale deformation-strain field,the large earthquakes occur mainly in the boundary zones of block,which are associated with block movement as a whole,so the spatial small-scale deformation-strain field is the basis for assessing the activities of small and moderate earthquakes,block movement and strain fields are the basis for assessing the activities of the large earthquake.The strain during 2006-2009 shows "south compressing and north tensing" of the Datong basin and Xindai basin,"inner low and outer high" of the main strain rate of Taiyuan basin,"north compressing and south tensing" of Linfen basin.Horizontal movement of each basin has the tenso-shear or compresso-shear activity.Large-scale changes show a certain amount of strain in Shanxi fault subsidence zone.
On the basis of the results of the strain displacement field and the principal strain rate calculated from the data observed from Shanxi GPS local area net,the small-scale deformation and strain of the various basins are researched,as well as the overall changes of Shanxi fault subsidence zone.Meanwhile,from the observational data of the area network of network engineering,the differential activities and the strain rate resulted from the interaction of the Ordos block with the Taihang Mountains block,within Shanxi fault subsidence zone are calculated,which is a spatial large-scale change.There are significant differences in different scales of strain field and displacement field,which are also different in the implications of earthquake prediction.Small and moderate earthquakes are more random,which are associated with the spatial small-scale deformation-strain field,the large earthquakes occur mainly in the boundary zones of block,which are associated with block movement as a whole,so the spatial small-scale deformation-strain field is the basis for assessing the activities of small and moderate earthquakes,block movement and strain fields are the basis for assessing the activities of the large earthquake.The strain during 2006-2009 shows "south compressing and north tensing" of the Datong basin and Xindai basin,"inner low and outer high" of the main strain rate of Taiyuan basin,"north compressing and south tensing" of Linfen basin.Horizontal movement of each basin has the tenso-shear or compresso-shear activity.Large-scale changes show a certain amount of strain in Shanxi fault subsidence zone.
引文
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8郭良迁,等.中国大陆地壳运动与汶川Ms8.0地地震孕育的关系[J].地球物理学报,2009,52(2):531-537.(Guo Liangqian,et al.Crustal motion of Chinese mainland and preparation ofMs8.0Wenchuan earthquake in Sichuan province[J].Chinese J.Geophys,2009,52(2):531-537)
9郭良迁.汶川Ms8.0地震前龙门山断裂带的水平形变和应变特征[J].国际地震动态,2009,(4):37.(Guo Lian-gqian.The characteristics of horizontal deformation and strain in longmenshan fault zone befor WenchuanMs8.0earth-quake[J].Recent Developments in World Seismology,2009,(4):37)
2汪良谋.华北强震时-空变化某些特点与近期强震活动趋势[J].地震地质,1987,9(2):39-47.(Wang Liangmou.Some features of strong earthquake activity in space and time variation and recent seismically active trend in North China[J].Seismology and Geology,1987,9(2):39-47)
3张国民,等.华北强震规律的研究[J].中国地震,1988,4(3):66-70.(Zhang Guomin,et al.A study on the regu-larity of strong earthquakes in North China[J].Earthquake Research in China,1988,4(3):66-70)
4郭良迁,等.山西断陷带的形变应变特征及地震活动[J].大地测量与地球动力学,2004,(4):64-71.(Guo Liangqian,et al.Characteistics of crust deform ation and strain of shanxi rift zone and seism icity[J].Journal of Geod-esy and Geodynamics,2004,(4):64-71)
5杨国华,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.(Yang Guohua,et al.The movement trend and dynamic character in Shanxi fault zone[J].Earthquake Research in China,2002,18(2):148-156)
6邓起东,等.中国活动构造与地震活动[J].地学前缘,2003,10(S1):66-73.(Deng Qidong,et al.Active tecton-ics and earthquake activities in China[J].Earth science Frontiers,2003,10(S1:66-73)
7马宏生,等.中国大陆及其邻近地区强震活动与活动地块关系研究[J].地学前缘,2003,10(S1):74-80.(Ma Hongsheng,et al.Correlation between strong earthquake ac-tivity and active crustal-block in China mainland and its adjacent regions[J].Earth Science Frontiers,2003,10(S1):74-80)
8郭良迁,等.中国大陆地壳运动与汶川Ms8.0地地震孕育的关系[J].地球物理学报,2009,52(2):531-537.(Guo Liangqian,et al.Crustal motion of Chinese mainland and preparation ofMs8.0Wenchuan earthquake in Sichuan province[J].Chinese J.Geophys,2009,52(2):531-537)
9郭良迁.汶川Ms8.0地震前龙门山断裂带的水平形变和应变特征[J].国际地震动态,2009,(4):37.(Guo Lian-gqian.The characteristics of horizontal deformation and strain in longmenshan fault zone befor WenchuanMs8.0earth-quake[J].Recent Developments in World Seismology,2009,(4):37)
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