摘要
利用华北地区 1 992 ,1 995和 1 996年所施测的高精度 GPS结果 ,对华北地区内部同期不同运动性质的活动单元进行辨别 ,确定了 4个有明显差异运动的活动单元和 1个过渡带 ,它们分别是鄂尔多斯 -阴山单元、燕山单元、晋冀鲁单元、胶辽鲁单元和燕—冀过渡带 ;并给出了这一时期相邻单元间的相对运动 ,具体为 :1鄂尔多斯 -阴山单元与燕山单元之间不存在明显的压缩运动 (量值为 0 .4± 1 .3 mm/a) ;2晋冀鲁单元背离鄂尔多斯 -阴山单元向东偏南40°的方向运动 ,量值为 4.4± 1 .0 mm/a;3相对于燕—冀差异运动转换带 ,燕山单元向西偏北 38°方向运动 ,量值为 2 .4± 1 .3mm/a,晋冀鲁单元向东偏南 35°方向运动 ,量值为 2 .3±0 .9mm/a;4晋冀鲁单元相对于燕山单元向东偏南 37°方向呈张拉型左旋运动 ,量值为 4.7± 1 .4mm/a;5位于晋冀鲁断块南部郯庐带附近的局部地区有偏离晋冀鲁单元的运动 ,方向为南偏西 1 4°,量值为 1 .5± 1 .1 mm/a;6相对于晋冀鲁单元 ,胶辽鲁单元有顺时针运动的趋势。其与燕山单元为邻的北端表现为张拉型右旋运动 ,南端则表现压性运动 .需要说明的是 ,这里所给出的误差是根据单元内各点位移间的离散性得到的 ,并不是由观测点位移误差计算求得的 .分析结果还表明 :1山西带和燕—冀过渡带是?
Based on the high-accuracy data obtained from the GPS measurements carried out in 1992, 1995 and 1996, the isochronous active units with different kinematic property inside the North China area have been distinguished, 4 active units and 1 transition zone with distinct differential movement have been determined. They are Ordos-Yinshan unit, Yanshan unit, Shanxi-Hebei-Shandong (Jin-Ji-Lu) unit, Jiaodong-Liaoning-Shandong (Jiao-Liao-Lu) unit and Yanshan-Hebei (Yan-Ji) transition zone. The relative movements among the neighboring units in this period have been given. 1 The compressive movement between Ordos-Yinshan unit and Yanshan unit is not obvious with an amount of 0.4±1.3 mm/a. 2 Jin-Ji-Lu unit moves E40°S off the Ordos-Yinshan unit and the magnitude is 4.4±1.0 mm/a. 3 Relative to the Yan-Ji transition zone of differential movement, Yanshan unit shifts W38°N with a value of 2.4±1.3 mm/a and Jin-Ji-Lu unit moves eastward 35° by south with an amount of 2.3±0.9 mm/a. 4 Jin-Ji-Lu unit has a tensional left-lateral movement of 4.7±1.4 mm/a in the direction of E37°S relative to Yanshan unit. 5 Some area near Tanlu belt which is located in the southern part of Jin-Ji-Lu block has a southward movement 14° by west with a magnitude of 1.5±1.1 mm/a off the Jin-Ji-Lu unit. 6 Relative to Jin-Ji-Lu unit, Jiao-Liao-Lu unit has a trend of clockwise movement with a tensional right-lateral motion at the north end which neighbors Yanshan unit and a compressive motion at the south end. It should be noted that the errors given in the paper are obtained based on the divergence among the displacements of the sites in the unit, rather than the value calculated from the displacement error of the sites. The analyzed results indicate that: 1 Shanxi tectonic zone and Yan-Ji transition zone are the major tectonic active zones to show the frame and magnitude of interior relative movement in North China area, and others are the secondary tectonic active zones; 2 The complete horizontal deformation in the North China area is not hom
出处
《地震学报》
CSCD
北大核心
2001年第1期1-10,共10页
Acta Seismologica Sinica
基金
国家重点基础研究发展规化"大陆强震机理与预测"项目! (G19980 4 0 70 3)
