Problems of Gravimeter Calibration in High Precision Gravimetry

Meurers, Bruno

doi:10.1007/978-3-642-79721-7_3

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Several authors (e.g. [11,12]) have reported abnormal reaction to atmospheric pressure variations in some LaCoste & Romberg (LR) gravimeters due to inefficiency of the meter sealing or loss of vacuum over time. All the aforementioned instrumental troubles (drift, tares, setup errors, and sealing leaks) strongly limit the repeatability of the gravity measurements carried out with spring sensors.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Micro-g LaCoste gPhone-054 spring gravimeter and the GWR-C026 superconducting gravimeter in Strasbourg (France) using a 300-day time series

2011

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We report on the results of a comparative analysis carried out on more than ten months of co-located records collected at the J9 gravity station in Strasbourg (France) with a new generation spring gravimeter, the Micro-g LaCoste, Inc. gPhone-054 and the GWR-C026 superconducting gravimeter (SG-C026). The gPhone is essentially a LaCoste & Romberg, model G meter, but with an improved thermal system (a double oven) for increased temperature stability, which should result in an unprecedented improvement in noise and drift of this mechanical gravimeter. We test the performances of the gPhone-054 in terms of resolution, accuracy, noise level and long-term stability (drift) with respect to the SG-C026. Our comparative analysis is performed in a wide spectral domain, ranging from the body tides to the seismic band. This study confirms that the SG has better performances over the whole analysed spectral band. The gPhone-054 instrumental drift observed during this study still remains a critical point preventing the study of long-term gravity changes. In fact, compared with the SG, the drift is large and even non-linear. We observed a drift rate evolution characterized by a decrease from 50 µGal/day to 15 µGal/day, after about 1 month of operation. This makes it hard to distinguish real-time gravity changes from the instrumental drift. We tried to improve the drift modelling by using frequent absolute gravity (AG) measurements, but unfortunately during that time no significant gravity changes have been detected which would have helped us to discriminate short-term drift excursions from real gravity changes. In terms of noise levels, the gPhone-054 turns out to be about 10 times noisier than the SG-C026 at seismic frequencies, while in the tidal band, it is twice as noisy. In between, at periods ranging from 1 h to 6 h, the gPhone-054 is about 3 times noisier than the SG-C026 but performs slightly better than the Scintrex CG5 in terms of noise level and precision.

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Section: Introductionmentioning

confidence: 99%

Comparison of the Micro-g LaCoste gPhone-054 spring gravimeter and the GWR-C026 superconducting gravimeter in Strasbourg (France) using a 300-day time series

2011

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“…Mass correction. The gravitational effect of the topographic masses was calculated by applying an extremely accurate correction method: in the immediate vicinity of the stations (distance < 1200 m) the topography was approximated by bodies of arbitrary shape (polyhedral) [33], instead of flat-topped prisms. Considering the Earth's curvature, all mass corrections were calculated in a spherical approximation with a radius of 167 km, assuming a density of 2670 kgm −3 , a value very close to the density of the surface rocks of the investigated area.…”

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confidence: 99%

Geophysical Study of the Diendorf-Boskovice Fault System (Austria)

et al. 2022

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We describe here the results of the characterization of subsurface structures in an area of the south-eastern edge of the Bohemian Massif, in Austria by high-resolution geophysical survey techniques and advanced analysis methods of potential fields. The employed methods included potential field multiscale techniques for source-edge location and characterization of sources at depth. Our results confirmed the presence of already known structures: the location of the Diendorf Fault and the Moldanubian Shearzone are clearly recognized in the data at the same location as on the geological maps, even where the Diendorf fault is covered with sediments of the Molasse Basin. In addition, we detected several geological contacts between different rock types in the Bohemian Massif west of the Diendorf Fault. From our results, we were also able to quickly identify and image, without a priori information, previously unknown structures, such as faults with-depth-to-the top of about 500 m and magmatic intrusions about 400 m deep.

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Hungary’s New Gravity Base Network (MGH-2000) and It’s Connection to the European Unified Gravity Net

Csapó¹,

Völgyesi

2002

International Association of Geodesy Symposia

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Problems of Gravimeter Calibration in High Precision Gravimetry

Cited by 4 publications

References 3 publications

Comparison of the Micro-g LaCoste gPhone-054 spring gravimeter and the GWR-C026 superconducting gravimeter in Strasbourg (France) using a 300-day time series

Comparison of the Micro-g LaCoste gPhone-054 spring gravimeter and the GWR-C026 superconducting gravimeter in Strasbourg (France) using a 300-day time series

Geophysical Study of the Diendorf-Boskovice Fault System (Austria)

Hungary’s New Gravity Base Network (MGH-2000) and It’s Connection to the European Unified Gravity Net

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