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AGU: Geophysical Research Letters

 

Index Terms

  • Geodesy and Gravity: Ocean/Earth/atmosphere interactions
  • Geodesy and Gravity: Terrestrial reference systems
  • Geodesy and Gravity: General or miscellaneous

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 29, 1967, 4 PP., 2002
doi:10.1029/2002GL015883

Degree-1 Earth deformation from very long baseline interferometry measurements

D. Lavallée

Nevada Bureau of Mines and Geology, and Seismological Laboratory, University of Nevada, Reno, USA

G. Blewitt

Nevada Bureau of Mines and Geology, and Seismological Laboratory, University of Nevada, Reno, USA

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.

Published 22 October 2002.

Citation: Lavallée, D., and G. Blewitt (2002), Degree-1 Earth deformation from very long baseline interferometry measurements, Geophys. Res. Lett., 29(20), 1967, doi:10.1029/2002GL015883.

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