摘要
长期GPS连续观测可获取高精度的垂直形变速度场,但多期GPS流动观测资料能否用于地壳垂直形变监测尚不明确。本文首先对中国大陆260个陆态网络基准站和2000个GPS流动站1999~2019年的观测资料进行高精度统一处理,获得各站点的时间序列和速度场,对筛选出的226个基准站和226个流动观测站的垂直形变速度场进行比较分析。结果表明,95%的连续GPS观测站的垂直形变速率误差小于0.5 mm/a,约50%的流动GPS观测站的垂直形变速率误差大于1 mm/a,约40%的流动站与连续站的垂直形变速率残差值大于2 mm/a,且约50%的流动GPS站点的垂直形变趋势与连续站不一致。西部地区的流动GPS观测站的垂直形变监测精度比东部高,这可能与东西部的观测环境和站点稳定性存在差异有关。对GPS连续站和流动站的垂直形变速度场的精度和残差进行分析认为,中国大陆流动GPS观测资料不适用于监测垂直形变小于2 mm/a的地区。
High precision vertical deformation velocity field can be obtained by long-term GPS continuous observation,but it is not clear whether GPS campaign observation data can be used for vertical deformation monitoring.In this paper,we process the observation data of 260 continuous stations and 2000 GPS campaign stations in Chinese mainland from 1999 to 2019.The time series and velocity field of each station are obtained.We compare and analyze the vertical deformation velocity field of 226 continuous stations and 226 campaign stations.The results show that the error of vertical deformation rate of 95%of continuous GPS stations are less than 0.5 mm/a and 50%of campaign GPS stations reach more than 1 mm/a.The residual value of the vertical deformation rate of about 40%of campaign stations and continuous stations are greater than 2 mm/a,and the vertical deformation trend of about 50%of campaign GPS stations are inconsistent with that of continuous stations.The vertical deformation monitoring accuracy of campaign GPS stations in the western region is higher than that in the eastern region,which may be related to the differences in observation environment and station stability between the eastern and western regions.Based on the analysis of the accuracy and residuals of vertical deformation velocity field of GPS continuous stations and campaign stations,we consider that the campaign GPS observations from China's Mainland are not suitable for monitoring the area with vertical deformation less than 2 mm/a.
作者
王东振
赵斌
余建胜
谭凯
WANG Dongzhen;ZHAO Bin;YU Jiansheng;TAN Kai(Key Laboratory of Earthquake Geodesy,Institute of Seismology,Wuhan 430071,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2021年第3期290-295,共6页
Journal of Geodesy and Geodynamics
基金
中国地震局地震研究所和地壳应力研究所基本科研业务费专项(IS201926297)
国家重点研发计划(2018YFC1503601)。
关键词
垂直形变
流动GPS观测
连续GPS观测
残差
vertical deformation
campaign GPS observation
continuous GPS observation
residual
