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Degree‐1 Earth deformation from very long baseline interferometry measurements
Author(s) -
Lavallée D.,
Blewitt G.
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl015883
Subject(s) - very long baseline interferometry , geodesy , series (stratigraphy) , baseline (sea) , global positioning system , interferometry , degree (music) , geology , deformation (meteorology) , earth's rotation , physics , optics , telecommunications , paleontology , oceanography , computer science , acoustics
The presence of degree‐1 deformations in very long baseline interferometry (VLBI) measurements is detected for the first time. We compare VLBI measurements with the deformation field predicted using a GPS‐determined load moment. Degree‐1 series in the center of figure frame have root mean square values up to 3 and 1.5 mm in the up and horizontal components respectively. The predicted baseline series are compared with VLBI baseline series where there are >50 matching points. For the period 1996–2001, 14 baselines out of 35 are significantly correlated (5% significance level). For the period 1985–2001, a sinusoidal fit to the GPS load‐moment series predicts baseline series at all VLBI epochs, 49 out of 110 baselines are significantly correlated (5% significance level). Comparison between annual signals estimated from the VLBI and predicted baseline series shows that degree‐1 deformation most likely dominates the annual phase of the VLBI series.