Research on the refinement algorithm of surface loading deformation based on Green's function  

作　　者：Chenfeng Li Tengxu Zhang Peibing Yang Lin He Yu Xia Wei Luan 

机构地区：[1]Three Gorges Geotechnical Engineering Co.Ltd.(Wuhan),Wuhan 430074,China [2]Hubei Luojia Laboratory,Wuhan 430079,China [3]Research Center of Beidou+Industrial Development of Key Research Institute of Humanities and Social Sciences in Hubei Province,College of Resources and Environmental Science and Engineering,Hubei University of Science and Technology,Xianning 437100,China [4]Wuhan Gravitation and Solid Earth Tides National Observation and Research Station,Wuhan 430071,China [5]College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China [6]School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China

出　　处：《Geodesy and Geodynamics》2025年第2期230-239,共10页大地测量与地球动力学(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant 42204006);the Education Commission of Hubei Province of China(Grant D20232802);the Open Fund of Wuhan,Gravitationand Solid EarthTides,National Observationand Research Station(Grant WHYWZ202407);the Open Fund of Hubei Luojia Laboratory(Grant 230100020,230100019).

摘　　要：Surface deformation calculations due to environmental loading typically rely on the Preliminary Reference Earth Model(PREM),which assumes a homogeneous and isotropic Earth structure,leading to noticeable errors.To enhance accuracy,the high-precision crustal model CRUST 1.0 is used to refine calculations of regional surface deformation caused by hydrological and non-tidal atmospheric loading.The improved model is applied to 27 Global Navigation Satellite System(GNSS)reference stations in the first phase of the Crustal Movement Observation Network of China(CMONOC),considering their geographical locations.Green's functions are employed to compute surface deformation at each site.Results indicate relative discrepancies of 11.78%and 14.14%for non-tidal atmospheric and hydrological loading compared to PREM,with vertical deformation differences reaching an average of 18.95%.Additionally,the distinct spatial distribution characteristics of the relative differences in each direction indicate that the improved RPREM model is more responsive to the mass variations derived from Gravity Recovery and Climate Experiment(GRACE).The results suggest that the improved PRREM model demonstrates higher sensitivity to loading variations than the PREM model.Utilizing the enhanced method of calculating surface deformation through the utilization of Green's function at the site could effectively reduce the calculation error caused by regional structure,leading to enhanced uniformity and isotropy of PREM.

关 键 词：Loading deformation GNSS Green's function PREM GRACE 

分 类 号：P228[天文地球—大地测量学与测量工程]