摘要
本文以晋冀蒙交界区域为研究区,基于研究区内1984年以来的区域精密水准和1999年以来的GNSS地壳形变观测数据.通过对区域精密水准数据采用拟稳平差、Kriging插值方法进行计算处理,获取研究区地壳垂直运动结果;对GNSS数据使用GAMIT/GLOBK软件计算,并采用欧拉矢量法转换,获取研究区地壳水平运动结果.经分析研究认为:研究区内地壳水平运动和垂直运动具有一定的关联性,但水平运动弱于垂直运动;利用区域精密水准成果确定的下降隆升垂直运动交界高梯度带(大于20 mm)是未来发生4.0级及以上地震的重点区域,说明地壳垂直运动信息对地震危险区判定具有很好的指示意义;通过地震活动统计发现地震活动分布具有明显的分区规律和迁移现象,与研究区地壳垂直运动变化规律较一致,表明区域精密水准是捕捉地壳和断层垂向运动的有效方法,另外在部分具有走滑和低倾角正断层附近地壳水平运动和垂直运动具有很好的关联性,且当关联性不一致或垂直运动活跃同时水平运动微弱时,附近未来发生地震的可能性较大.
The research object of this paper is the region of Shanxi,Hebei and Inner Mongolia,based on the regional precision leveling since 1984 and GNSS since 1999 of crustal deformation observation data in research region. By the quasi-stable adjustment calculation regional precision lever and then Kriging interpolation method,we get the contour map of crustal vertical movement; Using GAMIT/GLOBK software to calculate the GNSS data,and then the calculation results are transformed by the Euler vector method,we get the velocity field of crustal horizontal movement. Through the analysis and research we think： The horizontal movement and vertical movement of the crust in the study area are related to a certain level,but the horizontal movement is weaker than the vertical movement; using regional precision lever results to determine the vertical movement of the vertical motion of the fall of the high gradient zone（ greater than 20 mm） is the next occurrence of ≥4. 0 earthquakes in the regions of focus,it shows that the vertical movement of the crust is of great significance to the seismic hazard zone determination; By seismic activity statistics showed that the distribution of seismic activity has obvious zoning laws and migration,change and study area of vertical crustal movement is consistent with the law,it shows that the regional precision level is an effective method to effectively capture the vertical movement of the crust and fault,The other is strike slip and low angle normal faults near the horizontal crustal movement and vertical motion has relevance is in good part,And when the correlation is not consistent or vertical movement active while the level of weak motion near future earthquake is likely to occur.
作者
孟宪纲
占伟
朱文武
郭浩强
邢建华
徐东卓
李季钢
MENG Xian-gang;ZHAN Wei;ZHU Wen-wu;GUO Hao-qiang;XING Jian-hua;XU Dong-zhuo;LI Ji-gang(First Crust Monitoring and Application Center, CEA, Tianjin 300180, China;State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing, Wuhan University, Wahan 430079, China)
出处
《地球物理学进展》
CSCD
北大核心
2017年第5期1907-1914,共8页
Progress in Geophysics
基金
科技创新主任基金(FMC2015016)
科技部基础性工作专项(2015FY210400)
地震行业科研专项(201508009)联合资助
关键词
地壳形变运动
区域精密水准
高梯度带
水平运动速度场
地震活动性
crustal deformation movement
regional precision lever
high gradient belt
horizontal velocity field
seismic activity
