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Proceedings Paper

Detection of changes of the earth's volume and geometry by using GPS and VLBI data
Author(s): Xinhui Zhu; Fuping Sun; Ren Wang
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Paper Abstract

Based on the coordinates, velocities and their error estimations of GPS and VLBI stations, we used the Delaunay arithmetic forming triangles to approach the surface of the Earth, the Earth's area, volume and their changes in 2003. The feasibility of this method was also verified using stations through plate motion model interpolation. Results show that the geodetic and interpolated data give consistent conclusions. If the equator is taken as the boundary, the northern hemisphere of the Earth is undergoing compressive deformation and the southern hemisphere is undergoing extensional deformation; if the longitude line of 0º-180º is taken as the boundary, the East hemisphere is undergoing compressive deformation, while the western hemisphere is extended; and if the longitude line of 90º-270º is taken as the boundary, the Pacific hemisphere is undergoing compressive deformation and the Atlantic hemisphere is undergoing extensional deformation. The deformation patterns indicate that the earth is still undergoing asymmetrical deformation. Based on the combined data of GPS and VLBI, we obtained that the rate of volume changing is up to -1.5937×1012m3·a-1, corresponding to the Earth radius decreasing by 3-4 mm each year. This indicates that the earth is undergoing compressive deformation as a whole.

Paper Details

Date Published: 10 October 2009
PDF: 8 pages
Proc. SPIE 7471, Second International Conference on Earth Observation for Global Changes, 74711I (10 October 2009); doi: 10.1117/12.836321
Show Author Affiliations
Xinhui Zhu, Zhengzhou Institute of Surveying and Mapping (China)
Fuping Sun, Zhengzhou Institute of Surveying and Mapping (China)
Ren Wang, Xi'an Research Institute of Surveying and Mapping (United States)


Published in SPIE Proceedings Vol. 7471:
Second International Conference on Earth Observation for Global Changes
Xianfeng Zhang; Jonathan Li; Guoxiang Liu; Xiaojun Yang, Editor(s)

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