A new data bank for tidal gravity measurements (DB 92)

Melchior, P.

doi:10.1016/0031-9201(94)90085-x

Cited by 50 publications

(35 citation statements)

References 18 publications

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“…The formal error estimate of the FG5 instrument is about 1-2 gGal [Niebauer et al, 1995]. Intercomparisons made at the gravimeters is at the 1 gGal level [Klopping et al, 1997].…”

Section: Introductionmentioning

confidence: 99%

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Calibration of a superconducting gravimeter by comparison with an absolute gravimeter FG5 in Boulder

Francis

Niebauer

Sasagawa

et al. 1998

Geophysical Research Letters

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Abstract. This paper reports the results of a calibration of a superconducting gravimeter using simultaneous measurements of Earth tides with an absolute gravimeter. Nine consecutive days of observations were made with both the C024 superconducting gravimeter and the FG5-202 absolute gravimeter at the NOAA Table Mountain Gravity Observatory near Boulder, Colorado. The precision of the calibration factor is better than 0.1%. The calibration factor obtained in this fashion agrees well with that obtained from a moving platform. This experiment provides a noise estimate for both the superconducting and absolute gravimeter. In addition, the local air pressure admittances of both instruments compare well with a value close to -0.35 gGal/mbar.

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“…The formal error estimate of the FG5 instrument is about 1-2 gGal [Niebauer et al, 1995]. Intercomparisons made at the gravimeters is at the 1 gGal level [Klopping et al, 1997].…”

Section: Introductionmentioning

confidence: 99%

“…One method is to monitor the tides for a long period (2-3 years) and then use a well known tidal amplitude (e.g. O1) to calibrate the instrument [Melchior, 1994]. This method works well, however, it is very time consuming and one is ultimately tied to uncertainties in the tidal amplitude used to calibrate the instrument.…”

Section: Introductionmentioning

confidence: 99%

Calibration of a superconducting gravimeter by comparison with an absolute gravimeter FG5 in Boulder

Francis

Niebauer

Sasagawa

et al. 1998

Geophysical Research Letters

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“…The Schwiderski model (SCHW80) has been regarded for a long time in geophysics as a working standard for the calculation of the oceanic loading and attraction vector L (Melchior, 1994a). It is a numerical model that uses Laplace equations and includes oceanic loading, oceanic mass attraction and friction effects.…”

Section: Gravity Tide Residualsmentioning

confidence: 99%

“…However, the M 2 wave residual was practically zero. Melchior (1995) describes a new interpretation of the correlation found between the heat flow values and the tide residuals after reviewing and reanalyzing the original tide data of 300 stations (Melchior, 1994a). This review takes into account the objections raised by Rydelek et al (1991), removing sources of error, essentially the instrument calibration errors.…”

Section: Introductionmentioning

confidence: 99%

“…The observation of gravity tides, which began systematically from the 1960's onwards, now covers a great part of the world's surface (e.g., Melchior, 1994a). The density of information existing in Europe, in particular in Spain, and stored in the data bank of the International Center of Earth Tides (ICET -www.astro.oma.be/ICET/) can be used to make predictions and conduct correlation tests on the tidal residuals.…”

Section: Introductionmentioning

confidence: 99%

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On the interpretation of gravity tide residuals in the Iberian Peninsula

Fernández¹,

Fernández

Miguelsanz³

et al. 2008

Journal of Geodynamics

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Abstract.The interpretation of tidal gravity final residuals is an issue of high debate in geodesy. Whereas some authors suggest that final residuals are related to possible instrumental and measurement errors or to errors in the evaluation of the oceanic load computations, others propose certain empirical relationships between the gravity tidal residuals and the heat flow or the tectonothermal age of the lithosphere which, in turn, reveal structural variations with respect to a homogeneous elastic model.We examine such relationships in the Iberian Peninsula by studying correlations between the cosine component of the final residual vector for the M 2 and O 1 waves of the gravity tide potential and different structural parameters for a total of 21 gravity tide stations. The selected parameters, which are related to the capability of the lithosphere to deform, include surface heat flow as the main parameter and, to a lesser extend, lithospheric strength, Moho temperature and tectonothermal age of the lithosphere. Our study agrees with previous results by other authors and does not demonstrate the existence of empirical relationships between the gravity residuals and structural parameters. Actually, when we consider the most precise observations and recent ocean tide models the final residuals are mostly uncorrelated noise. Our results also agree with theoretical studies proposing that the distortions of the tidal gravity field from spherical symmetry are very small and hardly to observe.

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Accurate Correction Models for Tidal Gravity in Chinese Continent

Zhou

Sun

2009

Chinese J of Geophysics

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Accurate correction models for tidal gravity in Chinese continent are developed by using the recent theoretical and experimental models for the Earth's tidal gravity, in which the loading effects of the global and local ocean tides are combined. The relative difference of tidal gravity variations induced from different Earth's tidal gravity models is less than 0.06%. The ocean tide loading effects are about 4% of the total tidal gravity in coastal area while they are about 1% in inland. The difference between the ocean tide loading effects estimated from global ocean tide models and modified global models with local tides is about 10% of the total ocean tide loading effects. And the interpolated and extrapolated ocean tide loading effects are about 3% of the total ones. Comparing the observed tidal gravity variations by superconducting gravimeter with the ones calculated through the correction models, it is confirmed that the models developed in this study can accurately predict the tidal gravity signatures with a precision much better than 0.5 × 10−8 m·s−2. Consequently, it is expected that the models should provide an effective reference and accurate correction models for gravity measurements.

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A new data bank for tidal gravity measurements (DB 92)

Cited by 50 publications

References 18 publications

Calibration of a superconducting gravimeter by comparison with an absolute gravimeter FG5 in Boulder

Calibration of a superconducting gravimeter by comparison with an absolute gravimeter FG5 in Boulder

On the interpretation of gravity tide residuals in the Iberian Peninsula

Accurate Correction Models for Tidal Gravity in Chinese Continent

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