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华北稳定参考框架NChina20的建立及应用
鲍艳1, 王国权2, 于笑2, 肖根如3, 丁晓光4, 赵瑞斌5, 甘卫军6
1.北京工业大学城市与工程安全减灾教育部重点实验室, 北京 100124;2.美国休斯顿大学, 地球与大气科学系, 休斯顿 77024;3.东华理工大学, 测绘工程学院, 南昌 330013;4.陕西省地震局, 西安 710054;5.天津城建大学, 地质与测绘学院, 天津 300384;6.中国地震局地质研究所, 北京 100029
摘要:
选用中国大陆地壳运动观测台网(CMONOC)在华北地区约8年(2011年10月~2019年9月)的连续观测数据,建立了华北稳定参考框架——NChina20。NChina20与全球参考框架(IGS14)保持坐标系缩放比例一致,两坐标系统在历元2020.0对齐。本文详细介绍了将相对于IGS14的位置时间序列转换到NChina20的方法,并列举了NChina20在城市地面升降长期观测领域的应用。NChina20的稳定性(精度)在水平方向约为0.5mm/a,在垂直方向约为0.6mm/a。参考框架的稳定性随时间的推移而退化,建议NChina20的使用范围在时间上限于2006~2025年的时间窗口内,在空间上限于华北活动地块区域内。选用华北地区5个基岩站20年(2000~2019年)的连续观测数据,建立了华北地区季节性地面升降预测模型。华北稳定参考框架将每隔几年更新一次,以缓解框架稳定性随时间的退化,并与IGS参考框架同步更新。
关键词:  IGS14  GNSS  NChina20  稳定参考框架  华北活动地块  季节性地面升降模型
DOI:
分类号:P315
基金项目:国家自然科学基金(51829801)资助
Establishment and Application of Stable North China Reference Frame: NChina20
Bao Yan1, Wang Guoquan2, Yu Xiao2, Xiao Genru3, Ding Xiaoguang4, Zhao Ruibin5, Gan Weijun6
1.Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China;2.Department of Earth and Atmospheric Sciences, University of Houston, Houston 77204, USA;3.Faculty of Geomatics, East China University of Technology, Nanchang 330013, China;4.Shaanxi Earthquake Agency, Xi'an 710054, China;5.School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China;6.Institute of Geology, China Earthquake Administration, Beijing 100029, China
Abstract:
We have established a stable North China reference frame,designated as NChina20,by using eight-year continuous observation data from 30 GNSS stations fixed on the North China active crustal block. NChina20 is aligned in scale with IGS14. The two coordinate systems are tied at epoch 2020.0. In this article we introduce the method of converting the positional time series with respect to IGS14 to NChina20. Applications of NChina20 in precise land subsidence and rebound monitoring are illustrated. The stability(accuracy)of NChina20 is 0.5mm/a in the horizontal directions and 0.6mm/a in the vertical direction. The stability of the reference frame degrades with the expansion of the coverage area and the time window. We recommend that the use of NChina20 is limited to the North China tectonic block within a time window of 20 years from 2006 to 2025. We have also developed a seasonal vertical ground motion model in North China using 20 years(2000~2019)of continuous observation data from 5 GNSS stations mounted on bedrock. The regional reference frame will be updated every few years to mitigate degradation with time and synchronize with the update of IGS reference frames.
Key words:  IGS14  GNSS  NChina20  Stable reference frame  North China active crustal block  Seasonal ground uplift and subsidence model