Improvements in absolute gravity observations

Klopping, F. J.; Peter, G.; Robertson, D. S.; Berstis, Knute A.; Moose, Robert E.; Carter, William E.

doi:10.1029/91jb00249

Cited by 39 publications

(28 citation statements)

References 5 publications

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“…Following the procedures of NGS for raw data filtering (KLOPPING et al 1991), a mathematical filter is applied at IFE since 1991 in order to obtain more accurate gravity values: after a significant periodical signal is detected by the LOMB-SCARGLE periodogram, this is removed from the raw data and a new calculation of g is performed. The procedure continues until no more significant signal appears in the periodogram.…”

Section: Reliability Of Raw Data Filteringmentioning

confidence: 99%

Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics

Timmen

Röder

Schnüll

1993

Bulletin Géodésique

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Abstract. In addition to the on-line data evaluation during the measurements with the absolute gravity meter JILAG-3, a subsequently more intensive examination of the measured time/distance data pairs is performed. This allows an additional assessment of the gravity results, the station quality and the measurement conditions. Sinusoidal disturbances in the raw data deteriorate the determination of gravity. Incoming microseisms affect the mean result of the free-fall experiments randomly after a large number of measurements. Instrumental vibrations of the gravity meter during the measurement procedure may influence the gravity result systematically. A station comparison indicates that a 30 Hz frequency is triggered by JILAG-3 itself and influences the measurements depending on the stability of the foundation. Using a mathematical filter it is possible to separate the deteriorations from the gravity acceleration. Up to now an improvement in the absolute accuracy of gravity after filtering could not be proved, but an increase of the precision is indicated.

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Section: Reliability Of Raw Data Filteringmentioning

confidence: 99%

Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics

Timmen

Röder

Schnüll

1993

Bulletin Géodésique

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“…Savage and Pflaker [1991] and Savage and Thatcher [1992] use tide gauges to estimate vertical uplift, but this tech nique will only be useful when there is a long and reli able tide gauge record at multiple sites. Vertical mea surements using absolute gravity techniques are cur rently being tested by NOAA [Klopping et a/., 1991]…”

Section: Vertical Deformationmentioning

confidence: 99%

Crustal deformation

Larson¹

1995

Reviews of Geophysics

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Geodetic measurements of crustal deformation provide direct tests of geophysical models which are used to describe the dynamics of the Earth. Although geodetic observations have been made throughout history, only in the last several hundred years have they been sufficiently precise for geophysical studies. In the 19th century, these techniques included leveling and triangulation. Approximately 25 years ago, trilateration measurements were initiated by the USGS (United States Geological Survey) to monitor active faults in the United States. Several years later, NASA (National Aeronautics and Space Administration) begin an effort to measure plate tectonic motions on a global scale, using space geodetic techniques, VLBI (Very Long Baseline Interferometry) and SLR (Satellite Laser Ranging). The period covered by this report to the IUGG, 1991–1994, was a transition period in the field of crustal deformation. Trilateration measurements (previously the backbone of measurements across plate boundaries in the western United States and Alaska) have been abandoned. This system was labor‐intensive, involved highly trained crews to carry out the observations, and only measured the length between sites. In addition, NASA drastically cut the budgets for VLBI and SLR during this period. Fixed site VLBI systems are still operational, but mobile VLBI measurements in North America have ceased. SLR measurements continue on a global scale, but the remaining crustal deformation measurements are now being made with the Global Positioning System (GPS). Nonetheless, because of the time scales involved, older geodetic data (including leveling, triangulation, and trilateration) continue to be important for many geophysical studies.

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“…The vibration of reference mirror was acquired in real time directly by a long period seismometer with which the gravity measurement result was corrected by data processing. In addition, the effect of the change of optical path length due to the vibration of the vacuum-air interface introduced a correction term [7] . In this article, we discuss the effect of self-vibration on absolute gravity measurements.…”

Section: Introductionmentioning

confidence: 99%

“…There are two kinds of vibration sources, earth pulsation and selfvibration of the instrument [7][8] . Microseismic noise induced by earth pulsation usually has a large component at a frequency of a few tenths of Hz, and randomly affects each drop.…”

Section: Introductionmentioning

confidence: 99%

Effect of self-vibration on accuracy of free-fall absolute gravity measurement with laser interferometer

Feng¹,

Wu²,

Li³

et al. 2015

Ninth International Symposium on Precision Engineering Measurement and Instrumentation

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A free-fall absolute gravimeter was used to measure the gravity acceleration of a corner-cube released in high vacuum, and the gravity acceleration was determined by fitting the free-falling trajectories obtained through optical interferometry. During the measurement, the self-vibration of an absolute gravimeter caused ground vibration and the change in optical path length due to vibration of vacuum-air interface, which resulted in a measurement error. Numerical simulation was run by introducing vibration disturbance to the trajectories of free-fall. The effect of disturbance under different instrumental self-vibration conditions was analyzed. Simulation results indicated that the deviation of calculated gravity acceleration from the preset value and residuals amplitude after fitting depended on the amplitude and initial phase of the vibration disturbance. The deviation value and fitting residuals amplitude increased with the increasing of amplitude and there was a one-to-one correspondence between the two. The deviation of calculated gravity acceleration decreases by properly setting the initial phase difference of vibration disturbance with respect to the interference fringe signal.

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Improvements in absolute gravity observations

Cited by 39 publications

References 5 publications

Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics

Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics

Crustal deformation

Effect of self-vibration on accuracy of free-fall absolute gravity measurement with laser interferometer

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