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Advances in Earth Science  2014, Vol. 29 Issue (7): 828-834    DOI: 10.11867/j.issn.1001-8166.2014.07.0828
Effects of Crustal Structure for Estimation of Vertical Load Deformation on the Solid Earth Using GRACE in China Mainland
Jia Lulu1, 2, Xiang Longwei2, 3, Wang Hansheng2
1. National Earthquake Infrastructure Service, Beijing 100036, China; 2. State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
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When the inversion of vertical load deformation on Earth’s surface using GRACE (Gravity Recovery and Climate Experiment) data, the load Love numbers based on PREM (Preliminary Reference Earth Model) are commonly used. But the crustal structure under China mainland especially under Tibet Plateau is quite different from that given by PREM Earth model. New load Love numbers were calculated based on a modified Earth model which accounted for regional crustal structure in China mainland. And the effect of regional crustal structure in China mainland for estimation of vertical load deformation on Earth’s surface using GRACE RL05 data was investigated in this paper. It is found that the effect of crustal difference is very prominent. The relative difference of load Love numbers for vertical deformation can reach about 11% at degree 90. The extreme value of difference in vertical load deformation below 90 degree of spherical harmonic coefficients located at the southeastern Tibet Plateau and the maximum relative difference reaches 10%. The relative difference of the root mean square is about 4%. It is suggesting that an Earth model with a more realistic crustal structue instead of PREM should be used for the estimation of vertical load deformation in China mainland espacially in Tibet Plateau.

Key words:  Vertical deformation      Regional crustal structure      China mainland.      Satellite gravity      Solid Earth mass loading     
Published:  10 July 2014
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Jia Lulu
Xiang Longwei
Wang Hansheng

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Jia Lulu, Xiang Longwei, Wang Hansheng. Effects of Crustal Structure for Estimation of Vertical Load Deformation on the Solid Earth Using GRACE in China Mainland. Advances in Earth Science, 2014, 29(7): 828-834.

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