New Estimates of Present-Day Crustal/Land Motions in the British Isles Based on the BIGF Network
In this study we present results from a recent re-processing effort that included data from more than 120 continuous Global Positioning System (CGPS) stations in the British Isles for the period from 1997 to 2008. Not only was the CGPS network dramatically densified from previous investigations by the authors, it now also includes, for the first time, stations in Northern Ireland, providing new constraints on glacio-isostatic processes active in the region. In our processing strategy we apply a combination of re-analysed satellite orbit and Earth rotation products together with updated models for absolute satellite and receiver antenna phase centers, and for the computation of atmospheric delays. Our reference frame implementation uses a semi-global network of 37 stations, to align our daily position estimates, using a minimal constraints approach, to ITRF2005. This network uses a combination of current IGS reference frame stations plus additional IGS stations in order to provide similar network geometries throughout the complete time span. The derived horizontal and vertical station velocities are used to investigate present-day crustal/land motions in the British Isles. This first solution provides the basis for our contribution to the Working Group on Regional Dense Velocity Fields, 2007–2011 of the International Association of Geodesy Subcommission 1.3 on Regional Reference Frames.
KeywordsBritish Isle Absolute Gravity Coordinate Time Series Persistent Scatterer Interferometry Vertical Crustal Motion
The work presented was partly funded through the UK Department for Environment, Food and Rural Affairs (Defra), the Environment Agency and the Natural Environment Research Council Strategic Ocean Funding Initiative grant NE/F012179/1. BIGF (http://www.bigf.ac.uk) acknowledges its data providers: Defra, Environment Agency, IESSG, Land and Property Services Northern Ireland, Leica Geosystems Ltd., Met Office, National Physical Laboratory, NERC Proudman Oceanographic Laboratory, NERC Space Geodesy Facility, Newcastle University, and Ordnance Survey of Great Britain. The authors are also thankful to the IGS community for provision of all other CGPS data and related GPS products (Beutler et al. 1999), and EDINA JISC national academic data centre based at the University of Edinburgh, and the British Geological Survey.
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