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Showing results 101 to 120 of 172
   Modelling the global ocean tides: modern insights from FES2004; ; et al in Ocean Dynamics (2006), 56(5-6), 394--415 Detailed reference viewed: 142 (2 UL) Analysis of results of the International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003Francis, Olivier  ; van Dam, Tonie in Francis, Olivier; van Dam, Tonie (Eds.) International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003 (2006) Detailed reference viewed: 96 (2 UL)Paul Melchior (1925–2004); Francis, Olivier in EOS (2005), 86(22), 211 Detailed reference viewed: 179 (3 UL)Uncertainty of absolute gravity measurements; ; Francis, Olivier in Journal of Geophysical Research (2005), 110(B05406), 1-9 Detailed reference viewed: 115 (1 UL)Development of a European Combined Geodetic Network (ECGN); ; et al in Journal of Geodynamics (2005), 40(4-5), 450-460 To ensure the long-time stability of the terrestrial reference system with an accuracy of 10‑9 in the global and continental scale, the interactions between different time-dependent influences of the ... [more ▼] To ensure the long-time stability of the terrestrial reference system with an accuracy of 10‑9 in the global and continental scale, the interactions between different time-dependent influences of the system Earth to the terrestrial reference system and the related observation has to be considered in the evaluation models. It is proposed to establish a kinematic European Combined Geodetic Network (ECGN) and to integrate the spatial and height reference system into the Earth gravity field parameter estimation. This plan is in agreement with the foreseen IAG project of an Integrated Global Geodetic Observation System (IGGOS). In selected European stations ECGN will establish the combination of time series of spatial/geometric GNSS observations, precise levelling and tide gauge records with gravity field related observations (gravity, Earth tides). Observations are complemented with meteorological parameters, surrounding information of the stations, e.g. eccentricities and ground water level. A first call for participation in the project was directed to the implementation of the ECGN stations. These stations include the standard observation techniques GNSS (GPS/GLONASS—permanent), gravity (super conducting gravimeter and/or absolute gravimeter—permanent or repeated), levelling connections to nodal points of the European levelling network (UELN) (repeated) and meteorological parameters (permanent). A basic constituent of the ECGN stations is a local network for controlling the eccentricities at the 1 mm accuracy level in all three spatial components. For the contributing observation techniques, guidelines have been agreed upon to ensure equal observation principles [less ▲] Detailed reference viewed: 138 (3 UL)The Implementation of the ECGN Stations--Status of the 1st Call for Participation; ; et al in Torres, João Agria; Hornik, Helmut (Eds.) EUREF Publication No. 14 (2005) Detailed reference viewed: 81 (4 UL)Results of the international comparison of absolute gravimeters in Walferdange (Luxembourg) of November 2003Francis, Olivier ; van Dam, Tonie ; et alin Jekeli, C.; Bastos, L.; Fernandes, J. (Eds.) Gravity, Geoid and Space Missions - GGSM 2004 (2005) Detailed reference viewed: 161 (4 UL)Unified European Gravity Reference Network 2002 (UEGN02)—Status 2004; Francis, Olivier ; in Jekeli, C.; Bastos, L.; Fernandes, J. (Eds.) Gravity, Geoid and Space Missions - GGSM 2004 (2005) Detailed reference viewed: 123 (7 UL)Absolute Gravity Measurements in Lomonosov, Saint-Petersbourg, RussiaFrancis, Olivier Report (2004) Detailed reference viewed: 102 (5 UL)Superconducting gravimeters in seismologyFrancis, Olivier ; van Dam, Tonie in Newsletter of the European-Mediterranean Seismological Centre (2004), 21 Detailed reference viewed: 79 (4 UL)Concept and Status of the ECGN Project; ; et al in Torres, João Agria; Hornik, Helmut (Eds.) EUREF Publication No. 13 (2004) Detailed reference viewed: 88 (0 UL)Indication of the uplift of the Ardenne in long-term gravity variations in Membach (Belgium)Francis, Olivier ; ; van Dam, Tonie et alin Geophysical Journal International (2004), 158(1), 346-352 We report on the results of 7 yr of collocated gravity observations made with an FG5 abso- lute (AG) gravimeter and a GWR C-Series superconducting gravimeter (SG) located at the Membach Geophysical ... [more ▼] We report on the results of 7 yr of collocated gravity observations made with an FG5 abso- lute (AG) gravimeter and a GWR C-Series superconducting gravimeter (SG) located at the Membach Geophysical Station in eastern Belgium. The SG gravity residuals track changes in gravity periodically observed by the AG, at the microgal level. Further, in the SG resid- ual signal we distinguish a quasi-seasonal term that can be mostly explained by variations in local water storage effects. In the AG time-series we observe a small trend in the gravity of −0.6 ± 0.1 μGal yr−1 perhaps indicating that the Membach Station is being displaced up- wards by about 3.0 mm yr−1. An uplift of the region is confirmed by Global Positioning System (GPS) measurements performed 3 km away. We are able to explain the features in the gravity time-series in terms of water storage variability, post-glacial rebound and tectonic activity. [less ▲] Detailed reference viewed: 128 (3 UL)Proceedings of the Workshop: The Sate of GPS Vertical Positioning Precision: Separation of Earth Processes by Space Geodesyvan Dam, Tonie ; Francis, Olivier Book published by Centre Européen de Géodynamique et de Séismologie (2004) Detailed reference viewed: 116 (1 UL)Proceedings of the Workshop: IMGC-2002 Instrumentation and Metrology in GravimetryFrancis, Olivier ; van Dam, Tonie Book published by Centre Européen de Géodynamique et de Séismologie (2003) Detailed reference viewed: 74 (2 UL)Sixth International Comparison of Absolute Gravimeters, ICAG-2001; ; et al in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003) Detailed reference viewed: 59 (4 UL)GGFC Special Bureau for Loading: Current status and plansvan Dam, Tonie ; ; Francis, Olivier et alin Richter, Bernd; Schwegmann, Wolfgang; Dick, Wolfgang R. (Eds.) Proceedings of the IERS Workshop on Combination Research and Global Geophysical Fluids (2003) Detailed reference viewed: 82 (3 UL)RESEAU DE GRAVIMETRIE ABSOLUE ALGERIENFrancis, Olivier in Bulletin des Sciences Géographiques (2003), 09(Avril), 3-9 Detailed reference viewed: 73 (7 UL)Analysis of the Results of the Sixth International Comparison of Absolute Gravimeters ICAG-2001; ; et al in Tziavos, Ilias N. (Ed.) Gravity and Geoid 2002 (2003) Detailed reference viewed: 34 (0 UL)Comparison between modeled and Observed Gravity Tidal Parameters at Ny-Alesund, Svalbard; ; et al in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003) Detailed reference viewed: 57 (1 UL)Genèse et Futur d'un laboratoire de Gravimétrie à Walferdange (Luxembourg); ; Francis, Olivier in Helmut Moritz's Fetschrift zum 70. Geburtstag (2003) Detailed reference viewed: 52 (3 UL) |
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