陈晓东^1,2,,
李航^1,2,
邓明莉^1,,,
江利明^1,2,
孙和平^1,2,
李德伟^1,2,
张为民¹,
郝洪涛³,
桑鹏¹,
白林⁴
1. 中国科学院精密测量科学与技术创新研究院 大地测量与地球动力学国家重点实验室, 武汉 430077
2. 中国科学院大学, 北京 100049
3. 中国地震局地震研究所, 武汉 430071
4. 长安大学, 西安 710064

基金项目: 国家自然科学基金（41974023，41674083，41874094，41604070），中国地震局地震研究所所长基金（IS201726162）联合资助


详细信息

作者简介: 陈晓东, 男, 1975年生, 博士, 副研究员, 硕导, 主要从事地/月球重力场与固体潮的研究与应用.E-mail:chenxd@whigg.ac.cn

通讯作者: 邓明莉, 1983年生, 博士, 助理研究员, 主要从事地壳形变和重力场变化机制动力学研究.E-mail:dengml@whigg.ac.cn

中图分类号: P312;P223

收稿日期:2019-05-06
修回日期:2019-06-26
上线日期:2020-08-05

Experimental study of the surface subsidence in the city using gravity observing techniques

CHEN XiaoDong^1,2,,
LI Hang^1,2,
DENG MingLi^1,,,
JIANG LiMing^1,2,
SUN HePing^1,2,
LI DeWei^1,2,
ZHANG WeiMin¹,
HAO HongTao³,
SANG Peng¹,
BAI Lin⁴
1. State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
4. Chang'an University, Xi'an 710064, China


More Information

Corresponding author: DENG MingLi,E-mail:dengml@whigg.ac.cn

MSC: P312;P223

--> Received Date: 06 May 2019
Revised Date: 26 June 2019
Available Online: 05 August 2020


摘要
摘要:本文用重力测量技术对城市地表下沉进行了实验研究，从2016年3月到2017年5月在武汉市内地表下沉较大的部分城区进行了7期流动重力观测实验，并用D-InSAR观测的垂向位移进行了验证.数值结果表明重力观测每期整网平差后点值平均精度都小于10×10^-8m·s^-2，说明采用重力观测能在城市内获得高精度的区域重力变化.第7期相对于第1期的结果与D-InSAR在大致相同时间段内地表垂直位移结果比较表明，重力增加的大部分区域与D-InSAR观测到的地表下沉区域相一致，说明这些区域的重力增加主要是由地表下沉引起的.从第2到7期相对于第1期的重力变化说明在近12个月的时间内测区最大重力变化约40×10^-8m·s^-2，且局部区域的重力值是逐渐增加的，说明地表下沉是持续进行的.本实验结果说明重力观测技术能为城市地表下沉提供重力观测约束和机制解释.
关键词: 城市地表沉降/
混合重力测量/
区域重力变化/
D-InSAR/
CG-5重力仪

Abstract:Experimental study of the surface subsidence in the city using the gravity observing techniques is carried out in the paper. There are 7 gravity campaigns at regions with comparatively large surface subsidence in Wuhan city, China. The gravity results are finally verified by the vertical displacements observed by D-InSAR. Numerical results show that the point-value mean accuracies after the whole network adjustment for all the 7 gravity campaigns are all smaller than 10×10^-8m·s^-2, which indicates that high-accuracy regional gravity variations can be obtained by gravity measurements. The gravity change between the 7^th and the 1^st campaign is compared with vertical displacements observed by D-InSAR in almost the same time interval. The comparison shows that most of the regions with increased gravity change are coincided with those that have surface subsidence observed by D-InSAR, which accounts for the gravity increase mainly induced by the surface subsidence. The largest gravity change obtained from the 1^st campaign to the 2^nd and 7^th ones reaches about 40×10^-8m·s^-2 in about 12 months. And the surface subsidence is a continuous variation because some regional gravity values are gradually increasing. Results in the study show that gravity observation techniques can provide gravity constrain to the surface subsidence in the city and the subsidence mechanism explanation.
Key words:City surface subsidence/
Hybrid gravity observation/
Regional gravity variation/
D-InSAR/
CG-5 gravimeter



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