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Degree-1 earth deformation from very long baseline interferometry measurements

Lookup NU author(s): Dr David Lavallee, Professor Geoffrey Blewitt


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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.

Publication metadata

Author(s): Lavallée DA, Blewitt G

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2002

Volume: 29

Issue: 20

Pages: 28-1

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: American Geophysical Union