Towards a stable European vertical velocity reference system using VLBI, GPS and absolute gravity measurements

Details Towards a stable European vertical velocity reference system using VLBI, GPS and absolute gravity measurements Towards a stable European vertical velocity reference system using VLBI, GPS and absolute gravity measurements

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf...65c&link_type=abstract

Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,

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Scientific paper

The European VLBI-network has now been operational for a decade and is able to provide long term site motions in a stable inertial reference frame. More recently, GPS permanent stations in Europe have collected daily data and thus created time series of high density and quality that allow the determination of relative site motions. A comparison of vertical motions obtained independently from both techniques shows that there are common trends indicating the presence of 'real' motion in distinct areas. It is possible to define a reference site or a group of sites in central Europe with similar motion to form a vertical velocity platform which serves to describe the motion in other parts of the European continent. As an independent technique to verify vertical motion absolute gravity measurements can be employed. After the reduction of tidal and environmental mass effects (air pressure and groundwater) the long term trends in gravity time series from Wettzell, Germany and Medicina, Italy are used to derive first estimates of vertical motion at these sites.

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