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《Chinese Journal of Geophysics》 2005-05
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Effects of non-tectonic crustal deformation on continuous GPS position time series and correction to them

WANG Min 1,2, SHEN Zheng-Kang 1,3, DONG Da-Nan 41 State Key Laboratory of Earthquake Dynamics,Institute of Geology, China Earthquake Administration, Beijing 100029, China2 Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China 3 Department of Earth and Space Sciences, University of California, Los Angeles, California 90095-1567, USA4 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA  
A crustal deformation field observed by GPS usually includes both tectonic and non-tectonic deformation signals, and it is vitally important to remove the non-tectonic deformation signals from the data in order to effectively use GPS observations to study tectonic deformation. Using the Earth satellite data and geophysical models, we calculate non-tectonic crustal deformation caused by ocean tide loading, atmospheric mass loading, snow and soil moisture mass loading, and non-tidal ocean mass loading. Based on the quantitative analyses, the effects of non-tectonic crustal deformation on the position time series of GPS fiducial stations from the Crustal Movement Observation Network of China are studied and corrected. Our study shows that these effects on the vertical components of station positions are remarkable, especially those resulted from the atmospheric mass loading and snow and soil moisture mass loading. Using these models to correct for the non-tectonic deformation, we have reduced the RMS of the station vertical position by about 1 mm, which is about 11% of the total RMS. The amplitudes of annual vertical position variations are also reduced by about 37%. Moreover, we find that the position time series corrected using geophysical models followed by an empirical fitting of annual and semi_annual variations are smoother than that corrected using the empirical fitting of annual and semi_annual variations only, indicating that geophysical model corrections can not be substituted by pure empirical fitting in removing the non_tectonic deformation effects.
【Fund】: 国家科技攻关计划(2004BA601B010201);; 科技部重大基础研究前期研究专项(2001CCB01100)基金资助.
【CateGory Index】: P228.4
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