Set standard deviation, repeatability and offset of absolute gravimeter A10-008

Schmerge, D.; Francis, Olivier

doi:10.1088/0026-1394/43/5/012

Cited by 26 publications

(21 citation statements)

References 5 publications

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“…In the last decade, formalized comparisons of absolute gravimeters have been conducted only in Europe at the Bureau International des Poids et Mesures (BIPM) and the Underground Laboratory for Geodynamics in Walferdange (WULG) (Vitushkin et al 2002;Francis and van Dam 2006;Francis et al 2010;Jiang et al 2011); these comparisons were well organized with more than 10 gravimeters participating. Smaller comparisons of two absolute gravimeters have often occurred in the last decade, and they have often been performed in other smaller observatories; these smaller comparisons also were primarily performed in Europe, but the Canadian Absolute Gravity Site (CAGS) in Canada was also utilized (Liard et al 2003;Van Camp et al 2003;Schmerge and Francis 2006;Simon et al 2006;Wilmes and Falk 2006). On October 18, 2010, participants of the 2010 North American Comparison of Absolute Gravimeters (NACAG-2010) met at the David Skaggs Research Center in Boulder, Colorado for a one day workshop to discuss topics concerning absolute gravity.…”

Section: Introductionmentioning

confidence: 99%

Results of the first North American comparison of absolute gravimeters, NACAG-2010

Schmerge

Francis

Henton

et al. 2012

J Geod

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The first North American Comparison of absolute gravimeters (NACAG-2010) was hosted by the National Oceanic and Atmospheric Administration at its newly renovated Table Mountain Geophysical Observatory (TMGO) north of Boulder, Colorado, in October 2010. NACAG-2010 and the renovation of TMGO are part of NGS's GRAV-D project (Gravity for the Redefinition of the American Vertical Datum). Nine absolute gravimeters from three countries participated in the comparison. Before the comparison, the gravimeter operators agreed to a protocol describing the strategy to measure, calculate, and present the results. Nine sites were used to measure the free-fall acceleration of g. Each gravimeter measured the value of g at a subset of three of the sites, for a total set of 27 g-values for the comparison. The absolute gravimeters agree with one another with a standard deviation of 1.6 μGal (1 Gal ≡ 1 cm s −2 ). The minimum and maximum offsets are −2.8 and 2.7 μGal. This is an excellent agreement and can be attributed to multiple factors, including gravimeters that were in good working order, good operators, a quiet observatory, and a short duration time for the experiment. These results can be used to standardize gravity surveys internationally.

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Section: Introductionmentioning

confidence: 99%

Results of the first North American comparison of absolute gravimeters, NACAG-2010

Schmerge

Francis

Henton

et al. 2012

J Geod

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“…On the other hand, MGL announced the accuracy of A10 is 10 gal, which is restricted by numerous factors including the tides and other geophysical corrections. [25] investigated and discussed about the precision and the accuracy of A10-008 and they confirmed that it was better performance than the specifications. As described later, we also confirmed that the accuracy of A10-017 usually shows better than 10 gal in good condition.…”

Section: Absolute Gravity Measurements Using the A10 Gravimetermentioning

confidence: 84%

Detecting Land Subsidence Using Gravity Method in Jakarta and Bandung Area, Indonesia

Setyawan

Fukuda

Nishijima

et al. 2015

Procedia Environmental Sciences

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Since the declining of groundwater level often causes the land subsidence, it is important to monitor both height changes and gravity changes. The rate of gravity changes versus height changes depends on the density of the material. Thus it gives important information about the mechanism of the land subsidence. The objective of research is to monitoring the land subsidence by gravity observations. Establishing a new method to monitor the environmental issues such as groundwater variation, land subsidence, by means of absolute gravity measurements, a field type absolute gravity meter, Micro-G LaCoste Inc. A10 have been conducted in Jakarta and Bandung area, not only to confirm the accuracy of the instrument but also to investigate the practical and efficient measurement methods for the field surveys. The results present that the gravity value increases in the coastal in Jakarta. Otherwise the biggest gravity change was detected around Lembang fault in Bandung area.

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“…Although nominal accuracy for the A-10 absolute gravimeter reported by the manufacturer is ±10 microGal (1 microGal = 1x10 -8 m/s 2 ), after several years of operation, the observational standard deviation for measurements using a single gravimeter at stable sites is estimated to be ±5 microGal, and this value is used in data processing (Schmerge and Francis, 2006;Kennedy and Winester, 2011). To ensure this accuracy is met, the instrument undergoes periodic calibration, maintenance, and comparison with other absolute gravimeters (Schmerge and Francis, 2006;Schmerge and others, 2012). Earth tide corrections for absolute gravity measurements are determined using the ETGTAB model with the default wave groups in the Micro-g Lacoste, Inc. software (http://www.microglacoste.com/).…”

Section: Absolute Gravity Measurementsmentioning

confidence: 99%

Surface and subsurface microgravity data in the vicinity of Sanford Underground Research Facility, Lead, South Dakota

Kennedy¹,

Koth²,

Carruth³

2015

Open-File Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS (1-888-275-8747) For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Kennedy, J.R., Koth, K.R., and Carruth, R.L., 2015, Surface and subsurface microgravity data in the vicinity of Sanford Underground Research Facility, Lead, South Dakota: U.S. Geological Survey Open-File Report 2015-1043, 32 p., http://dx.doi.org/10.3133/ofr20151043. ISBN 2331ISBN -1258 iii AcknowledgmentsWe thank the staff at the Sanford Underground Research Facility, including Jaret Heise, Tom Trancynger, and Tom Regan, for ensuring that field work proceeded safely and efficiently. Absolute-gravity values from 2007, 2010, 2011, 2012, 2013, and 2014, arranged AbstractAbsolute gravity data were collected at 32 stations in the vicinity of the Sanford Underground Research Facility from 2007 through 2014 for the purpose of monitoring groundwater storage change during dewatering of the former Homestake gold mine in the Black Hills of South Dakota, the largest and deepest underground mine in North America. Eight underground stations are at depths from 300 feet below land surface to 4,850 feet below land surface. Surface stations were located using Global Positioning System observations, and subsurface stations were located on the basis of maps constructed from survey measurements made while the mine was in operation. Gravity varies widely at many stations; however, no consistent temporal trends are present across all stations during the 7-year period of data collection.

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Set standard deviation, repeatability and offset of absolute gravimeter A10-008

Cited by 26 publications

References 5 publications

Results of the first North American comparison of absolute gravimeters, NACAG-2010

Results of the first North American comparison of absolute gravimeters, NACAG-2010

Detecting Land Subsidence Using Gravity Method in Jakarta and Bandung Area, Indonesia

Surface and subsurface microgravity data in the vicinity of Sanford Underground Research Facility, Lead, South Dakota

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