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   Final report on the Seventh International Comparison of Absolute Gravimeters (ICAG 2005); Francis, Olivier  ; et alin Metrologia (2011), 48 Detailed reference viewed: 122 (6 UL) Results of the Seventh International Comparison of Absolute Gravimeters ICAG-2005 at the Bureau International des Poids et Mesures, Sèvres; ; et al in Mertikas, Stelios P. (Ed.) Gravity, Geoid and Earth Observation (2010) Detailed reference viewed: 187 (18 UL)Results of the European Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2007Francis, Olivier ; van Dam, Tonie ; et alin Gravity, Geoid and Earth Observation (2010) The second international comparison of absolute gravimeters was held in Walferdange, Grand Duchy of Luxembourg, in November 2007, in which twenty absolute gravimeters took part. A short description of the ... [more ▼] The second international comparison of absolute gravimeters was held in Walferdange, Grand Duchy of Luxembourg, in November 2007, in which twenty absolute gravimeters took part. A short description of the data processing and adjustments will be presented here and will be followed by the presentation of the results. Two different methods were applied to estimate the relative offsets between the gravimeters. We show that the results are equivalent as the uncertainties of both adjustments overlap. The absolute gravity meters agree with one another with a standard deviation of 2 μgal (1 gal = 1 cm/s2). [less ▲] Detailed reference viewed: 190 (9 UL)Seasonal effect on vertical positioning by Satellite Laser Ranging and GPS on Absolute Gravity at the OCA geodetic station, Grasse, France; ; et al in Geophysical Journal International (2006), 167(3), 1127-1137 We present a comparison of the vertical displacement monitored by independent techniques at the geodetic observatory of Grasse (France). Both Satellite Laser Ranging and Global Positioning System (GPS ... [more ▼] We present a comparison of the vertical displacement monitored by independent techniques at the geodetic observatory of Grasse (France). Both Satellite Laser Ranging and Global Positioning System (GPS) vertical position time-series over the period 1998–2003 show a prominent annual signal with a magnitude of 5–6 mm and reaching a maximum every year in July. Results from 14 absolute gravity measurements are also discussed. We investigate the possible origin of the observed signal by comparing it with predictions from various local and regional contributions. GPS results from a local network indicate that the periodic annual elastic deformation of the ∼1270 m high karstic plateau due to local water storage loading does not exceed 1–2 mm. In contrast, a combination of global model prediction for atmospheric and hydrological loading explains more than 70 per cent of the annual and semi-annual observed signals. [less ▲] Detailed reference viewed: 78 (0 UL)Results of the Sixth International Comparison of Absolute Gravimeters, ICAG-2001; ; et al in Metrologia (2002), 39(5), 407-427 The Sixth International Comparison of Absolute Gravimeters was held from 5 June to 28 August 2001 at the Bureau International des Poids et Mesures (BIPM), Sevres. Seventeen absolute gravimeters were used ... [more ▼] The Sixth International Comparison of Absolute Gravimeters was held from 5 June to 28 August 2001 at the Bureau International des Poids et Mesures (BIPM), Sevres. Seventeen absolute gravimeters were used to make measurements at five sites of the BIPM gravity network. The vertical gravity gradients at the sites and the ties between them were also measured using seventeen relative gravimeters. For the first time the ties were also measured using absolute gravimeters. Various methods of processing the absolute and relative data were tested to calculate the results. The final results of ICAG-2001 are presented. The acceleration due to gravity at a height of 0.90 m is given as (980925701.2 ± 5.5) Gal and (980928018.8 ± 5.5) Gal for sites A and B, respectively, calculated using a combined adjustment of the absolute and relative data. [less ▲] Detailed reference viewed: 134 (4 UL)Results from the Fifth Internationl Comparison of Absolute Gravimeters, ICAG97; Francis, Olivier ; van Dam, Tonie et alin Metrologia (2001), 38 The fifth in the series of International Comparisons of Absolute Gravimeters (ICAG) was held at the Bureau International des Poids et Measures (BIPM) in November 1997. Fifteen absolute gravimeters ... [more ▼] The fifth in the series of International Comparisons of Absolute Gravimeters (ICAG) was held at the Bureau International des Poids et Measures (BIPM) in November 1997. Fifteen absolute gravimeters participated in the comparison. The mean gravity value obtained at station A (0.9 m) at the BIPM was found to be 980 925 707.8 µGal with a standard uncertainty of 2.8 µGal. This is consistent with the results obtained in previous comparisons at this site. Conclusions based on the analysis of the present results and proposals for future activities are presented. [less ▲] Detailed reference viewed: 91 (2 UL) Intercomparison between the FG5 202 and FGG 206 at the site of the superconducting gravimeter C021 in Membach (Belgium)Francis, Olivier ; ; in Bulletin d'Information du Bureau Gravimétrique International (1999), (84), 36-39 Detailed reference viewed: 49 (2 UL)Network of Superconducting Gravimeters Benefits a Number of Disciplines; ; et al in EOS (1999), 80(11), 121-126 Detailed reference viewed: 144 (6 UL) |
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