地球模型对季节性负荷形变计算的影响——以川滇地区为例  

Effect of the Earth Model on the Calculation of Seasonal Load Deformation:A Case Study of the Sichuan—Yunnan Area

作　　者：佘雅文 吴伟伟[2] 刘泰[2] 付广裕 SHE Ya-wen;WU Wei-wei;LIU Tai;FU Guang-yu(School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China)

机构地区：[1]南京大学地球科学与工程学院,江苏南京210023 [2]中国地震局地震预测研究所,北京100036 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《地震》2021年第4期46-56,共11页Earthquake

基　　金：中国地震局地震预测研究所基本科研业务费专项(2020IEF0502,2020IEF0708);中国博士后科学基金资助项目(2020M680618);国家自然科学基金项目(41874003);国家重点研发计划项目(2018YFC1503704)。

摘　　要：利用川滇地区的GNSS和GRACE数据,结合不同地球模型和负荷理论,研究了地球模型对地表季节性负荷形变计算的影响,该工作对于选取合适的地球模型开展负荷形变研究具有一定的参考价值。研究表明:①川滇地区GNSS观测的地壳垂向季节性形变振幅为20 mm左右,GRACE反演的垂向形变与GNSS的结果相位一致,振幅存在差异。②区域地球模型的负荷勒夫数与其他地球模型的差异较大,且负荷勒夫数h_(n)对地球结构的变化较为敏感。③区域地球模型可以改善GRACE反演的负荷形变结果,从而减小与GNSS观测结果的差异。④川滇地区大部分GNSS测站的加权均方根比值减小量呈现由东北向西南方向逐渐增加的变化趋势。This study uses GNSS and GRACE data of the Sichuan-Yunnan area,combined with different Earth models and surface Load theory,to study the effect of the Earth model on the calculation of seasonal surface load deformation.This study has reference value for selecting a suitable Earth model to carry out research in surface load deformation.The research shows:①The amplitude of the crustal vertical seasonal deformation observed by GNSS at the Sichuan-Yunnan area is about 20 mm.The vertical deformation deduced by GRACE data is consistent in phase with the results of GNSS,but different in amplitudes.②The load Love numbers of the regional Earth model are quite different from other Earth models,and the load Love number h_(n) is more sensitive to the change of the Earth’s structure.③The regional Earth model can improve the surface load deformation results of GRACE inversion,thereby reducing the difference with GNSS observation results.④The reductions of weighted root mean square corresponding to the most GNSS stations at the Sichuan-Yunnan area show a trend of increasing gradually from northeast to southwest.

关 键 词：GNSS GRACE 地表负荷形变 

分 类 号：P315.7[天文地球—地震学]