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Aldiss D.,British Geological Survey | Burke H.,British Geological Survey | Chacksfield B.,British Geological Survey | Bingley R.,Institute of Engineering Surveying and Space Geodesy IESSG | And 10 more authors.
Proceedings of the Geologists' Association | Year: 2014

Long term planning for flood risk management in coastal areas requires timely and reliable information on changes in land and sea levels. A high resolution map of current changes in land levels in the London and Thames estuary area has been generated by satellite-based persistent scatterer interferometry (PSI), aligned to absolute gravity (AG) and global positioning system (GPS) measurements. This map has been qualitatively validated by geological interpretation, which demonstrates a variety of controlling influences on the rates of land level change, ranging from near-surface to deep-seated mechanisms and from less than a decade to more than 100,000 years' duration.During the period 1997-2005, most of the region around the Thames estuary subsided between 0.9 and 1.5mma-1 on average, with subsidence of thick Holocene deposits being as fast as 2.1mma-1. By contrast, parts of west and north London on the Midlands Microcraton subsided by less than 0.7mma-1, and in places appear to have risen by about 0.3mma-1. These rates of subsidence are close to values determined previously by studies of Quaternary sequences, but the combined GPS, AG and PSI land level change data demonstrate a new level of local geological control that was not previously resolvable. © 2013 Natural Environment Research Council.


Poutanen M.,Finnish Geodetic Institute | Ihde J.,Bundesamt fur Kartographie und Geodasie BKG | Bruyninx C.,Royal Observatory of Belgium ROB | Francis O.,University of Luxembourg | And 8 more authors.
International Association of Geodesy Symposia | Year: 2014

The European Combined Geodetic Network ECGN aims at the unification of time series of spatial/geometric observations obtained from GNSS, physical quantities from gravity field related observations, and other parameters including precise levelling, tide gauge records, and Earth and ocean tides. The objective of ECGN is to contribute to the maintenance of a stable terrestrial reference system for Europe, including 3D geometric parameters together with the gravity related height component. We discuss future, need and structure of the ECGN and a pilot project initiated for practical demonstration of the ECGN. © Springer-Verlag Berlin Heidelberg 2014.

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