References of "Francis, Olivier 50001803"
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See detailUncertainty of absolute gravity measurements
Van Camp, Michel; Williams, Simon D. P.; Francis, Olivier UL

in Journal of Geophysical Research (2005), 110(B05406), 1-9

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See detailPaul Melchior (1925–2004)
Dehant, Veronique; Francis, Olivier UL

in EOS : Transactions, American Geophysical Union (2005), 86(22), 211

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See detailThe Implementation of the ECGN Stations--Status of the 1st Call for Participation
Ihde, Johannes; Baker, Trevor; Bruyninx, Carine et al

in Torres, João Agria; Hornik, Helmut (Eds.) EUREF Publication No. 14 (2005)

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See detailUnified European Gravity Reference Network 2002 (UEGN02)—Status 2004
Boedecker, G.; Francis, Olivier UL; Kenyeres, A.

in Jekeli, C.; Bastos, L.; Fernandes, J. (Eds.) Gravity, Geoid and Space Missions - GGSM 2004 (2005)

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See detailDevelopment of a European Combined Geodetic Network (ECGN)
Ihde, Johannes; Baker, Trevor; Bruyninx, Carine 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 ▲]

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See detailSuperconducting gravimeters in seismology
Francis, Olivier UL; van Dam, Tonie UL

in Newsletter of the European-Mediterranean Seismological Centre (2004), 21

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See detailConcept and Status of the ECGN Project
Ihde, J.; Baker, T. F.; Bruyninx, C. et al

in Torres, João Agria; Hornik, Helmut (Eds.) EUREF Publication No. 13 (2004)

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See detailProceedings of the Workshop: The Sate of GPS Vertical Positioning Precision: Separation of Earth Processes by Space Geodesy
van Dam, Tonie UL; Francis, Olivier UL

Book published by Centre Européen de Géodynamique et de Séismologie (2004)

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See detailIndication of the uplift of the Ardenne in long-term gravity variations in Membach (Belgium)
Francis, Olivier UL; Van Camp, Michel; van Dam, Tonie UL et al

in 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 ▲]

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See detailUnified European Gravity Reference Network 2002 (UEGN2002), a Status Report
Kenyeres, A.; Boedecker, G.; Francis, Olivier UL

in Tziavos, Ilias N. (Ed.) Gravity and Geoid 2002 (2003)

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See detailRESEAU DE GRAVIMETRIE ABSOLUE ALGERIEN
Francis, Olivier UL

in Bulletin des Sciences Géographiques (2003), 09(Avril), 3-9

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See detailProcessing of the Absolute data of the ICAG01
Francis, Olivier UL; van Dam, Tonie UL

in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003)

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See detailGenèse et Futur d'un laboratoire de Gravimétrie à Walferdange (Luxembourg)
Melchior, Paul; Flick, Johny; Francis, Olivier UL

in Helmut Moritz's Fetschrift zum 70. Geburtstag (2003)

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See detailSixth International Comparison of Absolute Gravimeters, ICAG-2001
Vitushkin, Leonid; Jiang, Zhiheng; Becker, Matthias et al

in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003)

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See detailAnalysis of the Results of the Sixth International Comparison of Absolute Gravimeters ICAG-2001
Vistuhskin, Leonid; Jiang, Zhiheng; Becker, Matthias et al

in Tziavos, Ilias N. (Ed.) Gravity and Geoid 2002 (2003)

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See detailProceedings of the Workshop: IMGC-2002 Instrumentation and Metrology in Gravimetry
Francis, Olivier UL; van Dam, Tonie UL

Book published by Centre Européen de Géodynamique et de Séismologie (2003)

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See detailGGFC Special Bureau for Loading: Current status and plans
van Dam, Tonie UL; Plag, H. P.; Francis, Olivier UL et al

in Richter, Bernd; Schwegmann, Wolfgang; Dick, Wolfgang R. (Eds.) Proceedings of the IERS Workshop on Combination Research and Global Geophysical Fluids (2003)

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See detailComparison between modeled and Observed Gravity Tidal Parameters at Ny-Alesund, Svalbard
Sato, Tadahiro; Tamura, Y; Matsumoto, K et al

in Francis, Olivier; van Dam, Tonie (Eds.) Proceedings of the Workshop: IMG-2002 Instrumentation and Metrology in Gravimetry (2003)

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See detailExperiment to evaluate crustal motions across the Ardenne and the Roer Graben (north-western Europe) using absolute gravity measurements
Van Camp, M.; Camelbeeck, Thierry; Francis, Olivier UL

in Metrologia (2002), 39(5), 503-508

Absolute gravity measurements using the FG5-202 gravimeter have been conducted twice a year since September 1999 along a 120 km long profile across the Belgian Ardenne and the Roer Graben. As in this ... [more ▼]

Absolute gravity measurements using the FG5-202 gravimeter have been conducted twice a year since September 1999 along a 120 km long profile across the Belgian Ardenne and the Roer Graben. As in this region there is a difference of an order of magnitude between the inferred vertical crustal movements deduced from the difference of levelling (about 1 mm/year) and geological information (0.1 mm/year), our goal is to better constrain the present-day deformation. The absolute gravity measurements are performed at Rochefort, Humain, Werpin, Manhay, Sprimont, Membach (Belgium) and Monschau, Julich and Bensberg (Germany). A complete description of the network is given, and specific difficulties at some stations are presented. The precision achieved, generally less than 2.0 Gal integrated over more than 24 h of observation, is quite satisfactory at all stations but Julich. The mining activities around Julich cause an increase in the noise up to 7 Gal integrated over more than 72 h. We also discuss possible causes of gravity variations in this region. At present, it is still not possible to detect any trend in the available data. However, after five years of observations, we should be able to detect or constrain any possible long-term trend with a limit of 2.5 mm/year, assuming that a height change of 1 mm causes a change in gravity of 0.2 Gal. To ensure that the absolute gravimeter is giving accurate results, it has been regularly compared with the superconducting gravimeter installed at the Membach reference station. [less ▲]

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