摘要
利用中国陕西地区三期国家一等水准网的平差成果、两期二等水准网成果、两期陕西省高程控制网成果、两期全球导航卫星系统(global navigation satellite system,GNSS)大地控制网成果、陆态网络等工程连续运行基准站及流动站成果、地理国情监测成果,分析陕西地区最新垂直运动趋势。结果表明:GNSS垂直运动与水准垂直运动趋势整体一致;20世纪70年代至2018年,关中平原垂直运动呈下降趋势,关中平原周边山区及高原垂直运动呈上升趋势;陕北地区地壳垂直运动总体上呈现上升趋势,平均上升速度约为4 mm/a;关中平原总体呈下降趋势,下降最大速度为6 mm/a;陕南地区也呈上升趋势,平均上升速度约为3 mm/a;陕北、西安局部区域的不均匀地面沉降灾害严重。
Objectives:The vertical movement is obtained and analyzed with the different geodetic data of more than 40 years in Shaanxi area,China.Methods:Firstly,the adjustment result of the national first order level network in three periods is collected,the trend of 40 years is applied to describe the vertical movement as a whole which can show the uplift and downward of the crust,the data of the second order level network on the basis of the first order level points is adjusted,and the information with the higher resolution is obtained.Secondly,the other vertical information is collected from the result which includes global navigation satellite system(GNSS)network,crustal movement observation network of China and interferometric synthetic aperture radar(InSAR)result of the geography condition monitoring in Shaanxi area.Finally,the fusion result is computed with move fitting method.Results:Experimental result shows that the vertical movement of GNSS is consistent with the vertical movement of level on the whole.The uplift rate on the whole is about 4 mm/a in the north of Shaanxi area the maximum downward rate is 6 mm/a in Guanzhong plain,the uplift rate is about 3 mm/a in the south of Shaanxi area,and there is severe subsidence in the north of Shaanxi area and local area of Xi’an.Conclusions:From 1970 to 2018,a downward trend of vertical movement was shown in Guanzhong plain,and the uplift trend of vertical movement was displayed in mountains and plateaus around Guanzhong plain.
作者
杨宏山
聂建亮
YANG Hongshan;NIE Jianliang(Shaanxi Bureau of Surveying,Mapping and Geoinformation,Xi'an 710054,China)
出处
《武汉大学学报(信息科学版)》
EI
CAS
CSCD
北大核心
2022年第11期1854-1859,1895,共7页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金(41774004,41574003,41904040)
陕西测绘地理信息局科技创新项目(2020-4)。