地球模型对季节性负荷形变计算的影响以川滇地区为例

doi:10.12196/j.issn.1000-3274.2021.04.003

Abstract

Abstract: 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: ① The 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. ② The 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. ③ The regional Earth model can improve the surface load deformation results of GRACE inversion, thereby reducing the difference with GNSS observation results. ④ The 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.

Key words: GNSS, GRACE, Surface load deformation

CLC Number:

P315.7

SHE Ya-wen, WU Wei-wei, LIU Tai, FU Guang-yu. Effect of the Earth Model on the Calculation of Seasonal Load Deformation: A Case Study of the Sichuan—Yunnan Area[J]. EARTHQUAKE, 2021, 41(4): 46-56.

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

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