A Vertical Seismometer With Built-In Retroreflector for Absolute Gravimetry

Churchill, Manitoba, is located near the centre of postglacial uplift caused by the Earth's recovery from the melting of the Laurentide Ice Sheet. The value of present-day uplift at Churchill has important implications in the study of postglacial uplift in that it can aid in constraining the thickness of the ice sheet and the rheology of the Earth. The tide-gauge record at Churchill since 1940 is examined, along with nearby Holocene relative sea-level data, geodetic measurements, and recent absolute gravimetry measurements, and a present-day rate of uplift of 8–9 mm/a is estimated. Glacial isostatic adjustment models yield similar estimates for the rate of uplift at Churchill. The effects of the tide-gauge record of the diversion of the Churchill River during the mid-1970's are discussed.

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Evaluating measurement uncertainty in absolute gravimetry: An application of the Monte Carlo method

2008 IEEE Iinternational Workshop on Advanced Methods for Uncertainty Estimation in Measurement ◽

10.1109/amuem.2008.4589937 ◽

2008 ◽

Cited By ~ 1

Author(s):

Walter Bich ◽

Giancarlo D'Agostino ◽

Alessandro Germak ◽

Francesca Pennecchi

Keyword(s):

Monte Carlo ◽

Monte Carlo Method ◽

Measurement Uncertainty ◽

Absolute Gravimetry ◽

The Monte Carlo Method

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Accuracy Analysis of Gravity Field Changes from Grace RL06 and RL05 Data Compared to in Situ Gravimetric Measurements in the Context of Choosing Optimal Filtering Type

Artificial Satellites ◽

10.2478/arsa-2020-0008 ◽

2020 ◽

Vol 55 (3) ◽

pp. 100-117

Author(s):

Viktor Szabó ◽

Dorota Marjańska

Keyword(s):

Gravity Field ◽

Ocean Circulation ◽

Gravity Data ◽

The Other ◽

Subsurface Water ◽

Satellite Gravity ◽

Absolute Gravimetry ◽

The Earth ◽

Gravity Measurements ◽

Gravity Recovery

AbstractGlobal satellite gravity measurements provide unique information regarding gravity field distribution and its variability on the Earth. The main cause of gravity changes is the mass transportation within the Earth, appearing as, e.g. dynamic fluctuations in hydrology, glaciology, oceanology, meteorology and the lithosphere. This phenomenon has become more comprehensible thanks to the dedicated gravimetric missions such as Gravity Recovery and Climate Experiment (GRACE), Challenging Minisatellite Payload (CHAMP) and Gravity Field and Steady-State Ocean Circulation Explorer (GOCE). From among these missions, GRACE seems to be the most dominating source of gravity data, sharing a unique set of observations from over 15 years. The results of this experiment are often of interest to geodesists and geophysicists due to its high compatibility with the other methods of gravity measurements, especially absolute gravimetry. Direct validation of gravity field solutions is crucial as it can provide conclusions concerning forecasts of subsurface water changes. The aim of this work is to present the issue of selection of filtration parameters for monthly gravity field solutions in RL06 and RL05 releases and then to compare them to a time series of absolute gravimetric data conducted in quasi-monthly measurements in Astro-Geodetic Observatory in Józefosław (Poland). The other purpose of this study is to estimate the accuracy of GRACE temporal solutions in comparison with absolute terrestrial gravimetry data and making an attempt to indicate the significance of differences between solutions using various types of filtration (DDK, Gaussian) from selected research centres.

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Cold-Atom Absolute Gravimetry

Encyclopedia of Geodesy ◽

10.1007/978-3-319-02370-0_30-2 ◽

2016 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Franck Pereira dos Santos ◽

Sylvain Bonvalot

Keyword(s):

Cold Atom ◽

Absolute Gravimetry

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Deploying and operating an Absolute Quantum Gravimeter on the summit of Mount Etna volcano

10.5194/egusphere-egu21-15186 ◽

2021 ◽

Author(s):

Daniele Carbone ◽

Laura Antoni-Micollier ◽

Filippo Greco ◽

Jean Lautier-Gaud ◽

Danilo Contrafatto ◽

...

Keyword(s):

Gravity Data ◽

Volcanic Tremor ◽

Mount Etna ◽

Quality Data ◽

Etna Volcano ◽

High Quality ◽

Absolute Gravimetry ◽

Superconducting Gravimeters ◽

Mt Etna ◽

Absolute Quantum

The NEWTON-g project [1] proposes a paradigm shift in terrain gravimetry to overcome the limitations imposed by currently available instrumentation. The project targets the development of an innovative gravity imager and the field-test of the new instrumentation through the deployment at Mount Etna volcano (Italy). The gravity imager consists in an array of MEMS-based relative gravimeters anchored on an Absolute Quantum Gravimeter [2]. The Absolute Quantum Gravimeter (AQG) is an industry-grade gravimeter measuring g with laser-cooled atoms [3]. Within the NEWTON-g project, an enhanced version of the AQG (AQGB03) has been developed, which is able to produce high-quality data against strong volcanic tremor at the installation site. After reviewing the key principles of the AQG, we present the deployment of the AQGB03 at the Pizzi Deneri (PDN) Volcanological Observatory (North flank of Mt. Etna; 2800 m elevation; 2.5 km from the summit active craters), which was completed in summer 2020. We then show the demonstrated measurement performances of the AQG, in terms of sensitivity and stability. In particular, we report on a reproducible sensitivity to gravity at a level of 1 &#956;Gal, even during intense volcanic activity. We also discuss how the time series acquired by AQGB03 at PDN compares with measurements from superconducting gravimeters already installed at Mount Etna. In particular, the significant &#160;correlation with gravity data collected at sites 5 to 9 km away from PDN proves that effects due to bulk mass sources, likely related to volcanic processes, are predominant over possible local and/or instrumental artifacts. This work demonstrates the feasibility to operate a free-falling quantum gravimeter in the field, both as a transportable turn-key device and as a drift-free monitoring device, able to provide high-quality continuous measurements under harsh environmental conditions. It paves the way to a wider use of absolute gravimetry for geophysical monitoring.[1] www.newton-g.com[2] D. Carbone et al., &#8220;The NEWTON-g Gravity Imager: Toward New Paradigms for Terrain Gravimetry&#8221;, Front. Earth Sci. 8:573396 (2020)[3] V. M&#233;noret et al., "Gravity measurements below 10&#8722;9 g with a transportable absolute quantum gravimeter", Nature Scientific Reports, vol.&#160;8,&#160;12300 (2018)

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Effect of gravity curvature on large-scale atomic gravimeters

10.5194/egusphere-egu21-12044 ◽

2021 ◽

Author(s):

Dorothee Tell ◽

Étienne Wodey ◽

Christian Meiners ◽

Klaus H. Zipfel ◽

Manuel Schilling ◽

...

Keyword(s):

Large Scale ◽

Vibration Isolation ◽

High Sensitivity ◽

Free Fall ◽

Theory Approach ◽

Gravity Gradients ◽

Lower Saxony ◽

German Research Foundation ◽

Absolute Gravimetry ◽

Funding Program

In terrestrial geodesy, absolute gravimetry is a tool to observe geophysical processes over extended timescales. This requires measurement devices of high sensitivity and stability. Atom interferometers connect the free fall motion of atomic ensembles to absolute frequency measurements and thus feature very high long-term stability. By extending their vertical baseline to several meters, we introduce Very Long Baseline Interferometry (VLBAI) as a gravity reference of higher-order accuracy.By using state-of-the-art vibration isolation, sensor fusion and well controlled atomic sources and environments on a 10 m baseline, we aim for an intrinsic sensitivity &#963;g &#8804; 5 nm/s&#178; in a first scenario for our Hannover VLBAI facility. At this level, the effects of gravity gradients and curvature along the free fall region need to be taken into account. We present gravity measurements along the baseline, in agreement with simulations using an advanced model of the building and surroundings [1]. Using this knowledge, we perform a perturbation theory approach to calculate the resulting contribution to the atomic gravimeter uncertainty, as well as the effective instrumental height of the device depending on the interferometry scheme [2]. Based on these results, we will be able to compare gravity values with nearby absolute gravimeters and as a first step verify the performance of the VLBAI gravimeter at a level comparable to classical devices.The Hannover VLBAI facility is a major research equipment funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation). This work was supported by the DFG Collaborative Research Center 1464 &#8220;TerraQ&#8221; (Project A02) and is supported by the CRC 1227 &#8220;DQ-mat&#8221; (Project B07), Germany&#8217;s Excellence Strategy EXC-2123 &#8220;QuantumFrontiers&#8221;, and the computing cluster of the Leibniz University Hannover under patronage of the Lower Saxony Ministry of Science and Culture (MWK) and the DFG. We acknowledge support from &#8220;Nieders&#228;chsisches Vorab&#8221; through the &#8220;Quantum- and Nano-Metrology (QUANOMET)&#8221; initiative (Project QT3), and for initial funding of research in the DLR-SI institute, as well as funding from the German Federal Ministry of Education and Research (BMBF) through the funding program Photonics Research Germany.[1] Schilling et al. &#8220;Gravity field modelling for the Hannover 10 m atom interferometer&#8221;. &#160;Journal of Geodesy 94, 122 (2020)[2] Ufrecht, Giese, &#160;&#8220;Perturbative operator approach to high-precision light-pulse atom interferometry&#8221;. Physical Review A 101, 053615 (2020).

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