| 利用GPS果确定华北不同运动性质单元及活动方式 |
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| 引用本文： | 杨国华,韩月萍,张凤兰.利用GPS果确定华北不同运动性质单元及活动方式[J].地震学报,2001,23(1):1-10. |
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| 作者姓名： | 杨国华 韩月萍 张凤兰 |
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| 作者单位： | 1）中国天津300180中国地震局第一地形变监测中心
2）中国济南250061山东大学土建与水利工程学院 |
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| 基金项目： | 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) |
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| 摘 要： | 利用华北地区1992，1995和1996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0.41.3 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4.41.0 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2.41.3 mm/a，晋冀鲁单元向东偏南35方向运动，量值为2.30.9 mm/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4.71.4 mm/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14，量值为1.51.1 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——冀过渡带是体现华北内部相对运动格架及强弱的主要构造活动带，其它构造活动带则为次一级的活动带；② 华北地区整体水平形变并非均匀连续；③华北地区的动力模式可能为地幔拖曳＋边界耦合．
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| 关 键 词： | GPS测量 华北地区 活动单元 水平运动 变形机制 |
| 文章编号： | 0253-3782(2001)01-0001-10 |
| 修稿时间： | 2000年4月17日 |
DETERMINATION OF ACTIVE UNITS WITH DIFFERENT KINEMATIC PROPERTY AND THEIR ACTIVITY PATTERN IN NORTH CHINA BASED ON THE DATA FROM GPS REMEASUREMENTS |
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| Yang Guohua,Han Yueping,Zhang Fenglan.DETERMINATION OF ACTIVE UNITS WITH DIFFERENT KINEMATIC PROPERTY AND THEIR ACTIVITY PATTERN IN NORTH CHINA BASED ON THE DATA FROM GPS REMEASUREMENTS[J].Acta Seismologica Sinica,2001,23(1):1-10. |
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| Authors: | Yang Guohua Han Yueping Zhang Fenglan |
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| Abstract: | 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 unit, Shandong-Liaoning unit and Yanshan-Hebei 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 Shanxi-Hebei-Shandong unit moves E40°S off the Ordos-Yinshan unit and the magnitude is 4.4±1.0 mm/a. ③ Relative to the Yanshan-Hebei transition zone of differential movement, Yanshan unit shifts westwards 38° by north with a value of 2.4±1.3 mm/a and Shanxi-Hebei-Shandong unit moves eastward 35° by south with an amount of 2.3±0.9 mm/a. ④ Shanxi-Hebei-Shandong unit has a tensional left lateral movement of 4.7±1.4 mm/a in the direction of east 37° by south relative to Yanshan unit. ⑤ Some area near Tanlu belt which is located in the southern part of Shanxi-Hebei-Shandong block has a southward movement 14° by west with a magnitude of 1.5±1.1 mm/a off the Shanxi-Hebei-Shandong unit. ⑥ Relative to Shanxi-Hebei-Shandong unit, Shandong-Liaoning 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 Yanshan-Hebei transition zone are the major tectonic active zones to show the frame and magnitude of interior ralative movement in North China area, and others are the secondary tectonic active zones; ② The complete horizontal deformation in the North Chine area is not homogeneous nor successive; ③ The kinetic model of North China area might be ″mantle dragging plus boundary coupling″. |
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| Keywords: | GPS measurement North China area active unit horizontal movement deformation mechanism |
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