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Geodetic secular velocity errors due to interannual surface loading deformation


Santamaria-Gomez, A and Memin, A, Geodetic secular velocity errors due to interannual surface loading deformation, Geophysical Journal International, 202, (2) pp. 763-767. ISSN 0956-540X (2015) [Refereed Article]

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Copyright Statement

Copyright 2015 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society.

DOI: doi:10.1093/gji/ggv190


Geodetic vertical velocities derived from data as short as 3 yr are often assumed to be representative of linear deformation over past decades to millennia. We use two decades of surface loading deformation predictions due to variations of atmospheric, oceanic and continental water mass to assess the effect on secular velocities estimated from short time-series. The interannual deformation is time-correlated at most locations over the globe, with the level of correlation depending mostly on the chosen continental water model. Using the most conservative loading model and 5-yr-long time-series, we found median vertical velocity errors of 0.5 mm yr−1 over the continents (0.3 mm yr−1 globally), exceeding 1 mm yr−1 in regions around the southern Tropic. Horizontal velocity errors were seven times smaller. Unless an accurate loading model is available, a decade of continuous data is required in these regions to mitigate the impact of the interannual loading deformation on secular velocities.

Item Details

Item Type:Refereed Article
Keywords:time-series analysis, persistence, memory, correlations, clustering, transient deformation, kinematics of crustal and mantle deformation
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Santamaria-Gomez, A (Dr Alvaro Santamaria-Gomez)
UTAS Author:Memin, A (Mr Anthony Memin)
ID Code:108681
Year Published:2015
Web of Science® Times Cited:53
Deposited By:Mathematics and Physics
Deposited On:2016-05-03
Last Modified:2017-10-25

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