基于水准与重力资料的首都圈地区形变分析

Analysis of deformation characteristics in capital area based on level and gravity data

针对近年来首都圈地区形变分析手段的单一性,该文利用该地区2001、2007、2014年3期精密水准复测资料和2009、2014年两期流动重力数据,处理获得该地区2001—2007和2007—2014两个时间段的垂直形变特征和2009—2014年重力场累积动态变化特征,同时利用水准资料对同期重力变化结果进行垂直形变效应改正,获取校正后的重力场变化特征。实验结果表明:首都圈平原地区受华北地下水开采影响较为严重,垂直形变呈现明显的下沉现象,而在山区可以较为客观地反映构造运动信息。重力变化的垂直形变效应改正量基本在10×10-8(m·s-2)以内,对异常形态没有影响,研究区的重力场变化主要是对地壳深部介质密度变化和物质迁移过程的主要反映。

Aiming at the problem of singularity of deformation analysis methods in recent years,the vertical deformation characteristics of the 2001-2007 and 2007-2014 in capital area were obtained by using the three-stage level data in 2001,2007 and 2014,also dynamic characteristics of gravity field accumulation was got using 2009 and 2014 flow gravitational data.At the same time,the vertical deformation effect of the same period gravitational effect was corrected by using the leveling data,and the characteristics of the gravitational field after correction were obtained.The results showed that the influence of groundwater exploitation was serious in the plain area of capital,and the vertical deformation showed obvious subsidence change,and the tectonic movement information could be objectively reflected in the mountainous area.The vertical deformation effect of gravity change is within 10×10-8（m·s-2）,which has no effect on the abnormal shape.The change of the gravity field in the study area mainly reflects the change of the medium density and the material migration process in the deep crust.