摘要
针对甘肃省内板块运动活跃,基于高精度GNSS数据分析地表三维形变的资料相对较少的问题,该文利用GAMIT/GLOBK10.7软件对114个GSCORS近4.5年的连续观测数据进行处理,获取了甘肃CORS在ITRF2014框架下的三维速度场,分析了甘肃省内地表运动规律。结果表明:甘肃CORS水平方向自西向东整体运动趋势表现为由北偏东渐变为东偏南,具体表现为河西地区平均运动速率为31.3 mm/a、优势方向为北偏东84.4°,河东地区平均运动速率为36.4 mm/a、优势方向为东偏南9.7°;垂直方向整体上呈"东升西降"趋势,沉降区域主要分布在河西走廊,沉降速率在东西0.5~4 mm/a;隆升区域分布在兰州以东,隆升速率在1~5 mm/a;在无净旋转基准下存在明显的块体相对运动,东西方向呈拉张运动,站点相对速率达5 mm/a,南北方向为挤压运动,站点相对速率为2.3 mm/a。
Aiming at the problem that plate motion was active in Gansu province and the data of high-precision GNSS were relatively few to analyze the surface 3 D deformation,we processed the 114 GSCORS stations data nearly for 4.5 year by GAMIT/GLOBK 10.7 software and obtained the three-dimensional velocity and analysed the law of surface movement in this paper.The results showed that the horizontal direction of GSCORS was gradually changing from the north-east movement to the east-southern movement,Specifically,the horizontal average movement rate of Hexi area was 31.3 mm/a,the dominant direction was north by east 84.4°,the horizontal average movement rate of Hedong area was 36.4 mm/a,the dominant direction was east by south 9.7°.The vertical direction showed the trend of"rising from east to west",the settlement area was mainly distributed in the Hexi Corridor,the settlement rate was between 0.5~4 mm/a,and the uplift area was distributed in the east of Lanzhou,and the uplift rate was between 1~5 mm/a.There was obvious relative motion of block without net rotation datum,the east-west direction was stretched,the relative rate of station reaches 5 mm/a,the north-south direction was extrusion motion,and the relative rate of station was 2.3 mm/a.
作者
张朋吉
ZHANG Pengji(Surveying and Mapping Engineering Institute of Gansu,Lanzhou 730000,China;Emergency Surveying and Mapping Research Center of Gansu,Lanzhou 730000,China)
出处
《测绘科学》
CSCD
北大核心
2020年第9期5-10,共6页
Science of Surveying and Mapping
关键词
基准站
三维速度场
地表运动
地表沉降与隆升
拉张与挤压
datum station
three-dimensional velocity fields
ground motion
land subsidence and uplift
tension and extrusion
