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Earth Planets Space, Vol. 58 (No. 2), pp. e13-e16, 2006

E-LETTER

Mass-redistribution-induced crustal deformation of global satellite laser ranging stations due to non-tidal ocean and land water circulation

Hiroshi Takiguchi1, Toshimichi Otsubo2, and Yoichi Fukuda1

1Department of Geophysics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
2National Institute of Information and Communications Technology, 893-1 Hirai, Kashima, Ibaraki 314-8501, Japan

(Received October 24, 2005; Revised February 3, 2006; Accepted February 6, 2006; Online published February 17, 2006)

Abstract: E-LETTER Earth Planets Space, 58, e13-e16, 2006 The effect of the non-tidal ocean load (NTOL) and the continental water load (CWL) on crustal deformation are calculated for global satellite laser ranging (SLR) stations and on 4° × 4° grids (only over the land). For the regions most severely affected, the peak-to-peak displacements due to the NTOL are found to be as large as 3 mm for the horizontal components and 10 mm for the vertical component. The peak-to-peak displacements due to the CWL reach 3 mm for the horizontal components and 15 mm for the vertical component. We apply the time series of NTOL and CWL to precise SLR analysis. The LAGEOS orbit analysis reveals that the Estimating the Circulation and Climate of the Ocean (ECCO) model makes the root mean square (RMS) of the range residual 0.2% smaller, and that the CWL makes it 0.8% smaller, compared with the case where loading displacement is neglected. On the other hand, with the NTOL derived from Topex/Poseidon altimetry data, the SLR orbit fit is not improved.
Key words: Satellite laser ranging, non-tidal ocean load, continental water load, crustal deformation, Topex/Poseidon, ECCO.


Corresponding author E-mail: taki@kugi.kyoto-u.ac.jp


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