Detection of changes of the earth's volume and geometry by using GPS and VLBI data

Xinhui Zhu; Fuping Sun; Ren Wang

doi:10.1117/12.836321

9 October 2009 Detection of changes of the earth's volume and geometry by using GPS and VLBI data

Xinhui Zhu, Fuping Sun, Ren Wang

Proceedings Volume 7471, Second International Conference on Earth Observation for Global Changes; 74711I (2009) https://doi.org/10.1117/12.836321
Event: Second International Conference on Earth Observation for Global Changes, 2009, Chengdu, China

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.

Citation Download Citation

Xinhui Zhu, Fuping Sun, and Ren Wang "Detection of changes of the earth's volume and geometry by using GPS and VLBI data", Proc. SPIE 7471, Second International Conference on Earth Observation for Global Changes, 74711I (9 October 2009); https://doi.org/10.1117/12.836321

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KEYWORDS

Global Positioning System

Geodesy

Optical spheres

Data modeling

Motion models

Spherical lenses

Error analysis

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