Relative deformation rates between collocated VLBI stations and results comparisons with global solutions

Details Relative deformation rates between collocated VLBI stations and results comparisons with global solutions Relative deformation rates between collocated VLBI stations and results comparisons with global solutions

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46...70y&link_type=abstract

Acta Astronomica Sinica, vol. 46, no. 1, p. 70-75

Astronomy and Astrophysics

Astronomy

Astrometry: Rates Of Vlbi Baseline Length Change, Itrf2000 Terrestrial Reference Frame, Local/Regional Crustal Deformation Rates Between Collocated Vlbi Stations

Scientific paper

Accurate determination of station positions and velocity vectors for the realization and maintenance of the International Terrestrial Reference Frame (ITRF) are among the contributions of global VLBI stations. ITRF solutions, such as ITRF2000, are combination solutions using different space geodetic techniques and could have potential "inconsistencies" between different realizations. At present, the estimated average uncertainty on regularly observed baselines for VLBI determined baseline length change is better than ±1.0 mm/yr. This study discusses results of the relative deformations between nearby stations in 6 global collocated VLBI sites based on the ITRF2000 and using the NNR-NUVEL-1A model to calculate the modeled horizontal motions. Comparisons of the results with those of the ITRFs solutions and VTRF2003 solution (Nothnagel, 2003) are addressed. The technique uses the observed baseline rates as constraints to quantify local/regional crustal deformations relative to the NUVEL-1A model solution. It obtains the relative deformation rates between two closely spaced VLBI stations separated by a few hundred to few thousand meters, and determines improved deformations at a regional or local spatial scale, isolating the "inconsistencies" from the TRF solutions. The approach is introduced and preliminary comparisons are made.

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