Long-term and seasonal gravity changes at the Strasbourg station and their relation to crustal deformation and hydrology

Amalvict, M.; Hinderer, J.; Mäkinen, Jaakko; Rosat, Séverine; Rogister, Yves

doi:10.1016/j.jog.2004.07.010

Cited by 26 publications

(14 citation statements)

References 21 publications

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“…The AG trend is interpreted as a geophysical signal that could correspond to some long-term deformations. Amalvict et al (2004) have shown that the gravity was increasing in time at a rate of about 15.7 nm/s 2 /year from the beginning of 1997 to the end of 2002. In this paper, our data are spanning from the beginning of 1997 to the end of 2007, and the gravity increase observed in AG measurements is 13.3 ± 1.0 nm/s 2 /year, while the SG instrumental drift is deduced to be 20.6 ± 1.0 nm/s 2 /year.…”

Section: Sg Instrumental Driftmentioning

confidence: 99%

Analysis of a 10-year (1997–2007) record of time-varying gravity in Strasbourg using absolute and superconducting gravimeters: New results on the calibration and comparison with GPS height changes and hydrology

Rosat

Boy

Ferhat

et al. 2009

Journal of Geodynamics

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a b s t r a c tThis paper is devoted to a detailed investigation of a continuous record spanning more than 10 years (1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007) of the Strasbourg superconducting gravimeter (SG GWR C026). We show the results from various scale factor experiments using parallel registrations with an absolute gravimeter (AG FG5#206). These results allow us to discuss the time stability of the calibration of the SG. We also superimpose the AG and SG measurements to infer the long-term instrumental drift behavior of the SG but also the seasonal effects present at our station. These long-term effects are discussed in terms of height changes by using collocated GPS measurements (since 1999) and in terms of hydrology (mainly with large scale hydrological models). The collocated GPS height changes help in separating the gravity variation due to the vertical motion of the station from the variation due to the mass redistribution.

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Section: Sg Instrumental Driftmentioning

confidence: 99%

Analysis of a 10-year (1997–2007) record of time-varying gravity in Strasbourg using absolute and superconducting gravimeters: New results on the calibration and comparison with GPS height changes and hydrology

Rosat

Boy

Ferhat

et al. 2009

Journal of Geodynamics

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“…A description of the local hydrological situation at Strasbourg is given in Amalvict et al (2004). Minute data of the groundwater level are available in the GGP data base (GGP-ISDC) since March 1997.…”

Section: Strasbourgmentioning

confidence: 99%

Hydrological influences in long gravimetric data series

Harnisch

2006

Journal of Geodynamics

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“…Effects in time-dependent gravity observations due to water level and soil moisture variations, precipitation events, and snow covering have been discussed for a while (e.g. Abe et al, 2006;Amalvict et al, 2004;Bonatz, 1967;Bower and Courtier, 1998;Crossley et al, 1998;Elstner, 1987;Elstner and Kautzleben, 1982;Harnisch and Harnisch, 1999;Imanishi, 2000;Kroner, 2001;Kroner et al, 2007;Lambert and Beaumont, 1977;Mäki-nen and Tattari, 1988;Meurers et al, 2007;Peter et al, 1995;Sato et al, 2006;Virtanen, 2000;Zerbini et al, 2001). They range from a few nm/s 2 to some 10 nm/s 2 (10 nm/s 2 = 1µGal).…”

Section: Introductionmentioning

confidence: 99%

Detection of small hydrological variations in gravity by repeated observations with relative gravimeters

Naujoks

Weise

Kröner

et al. 2007

J Geod

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Abstract. Recently, a new application of timedependent gravity observations is emerging: the study of natural hydrological mass changes and their underlying processes. Complementary to GRACE data and continuous recordings with superconducting gravimeters, repeated observations with relative instruments on a local network may contribute to gain additional information on spatial changes in hydrology. The questions that need to be addressed are whether the results of these repeated measurements will be of sufficiently high resolution and accuracy, as well as how unique the information obtained will be. To examine this, a local gravity network with maximum point distances of 65 m was established in a hilly area around the Geodynamic Observatory Moxa, Germany. Using three to five LaCoste & Romberg relative gravimeters repeated measurements were carried out in a seasonal rhythm as well as at particular events like snowmelt or dryness in 17 campaigns between November 2004 and April 2007. The standard deviations obtained by least squares adjustment range from ±9 nm/s 2 to ±14 nm/s 2 for a gravity difference of one campaign, thus for gravity changes between two campaigns from ±13 nm/s 2 to ±20 nm/s 2 . Between the points of the network, spatial gravity changes of up to 171 nm/s 2 (139 nm/s 2 between two successive campaigns) could be proven significantly. They correlate with changes in the local hydrological situation. Particularly, a steep slope next to the observatory is identified as a gravimetrically significant hydrological compartment. The results obtained contribute to an improved reduction of the local hydrological signal in continuous gravity recordings and provide constraints to hydrological models.

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Long-term and seasonal gravity changes at the Strasbourg station and their relation to crustal deformation and hydrology

Cited by 26 publications

References 21 publications

Analysis of a 10-year (1997–2007) record of time-varying gravity in Strasbourg using absolute and superconducting gravimeters: New results on the calibration and comparison with GPS height changes and hydrology

Analysis of a 10-year (1997–2007) record of time-varying gravity in Strasbourg using absolute and superconducting gravimeters: New results on the calibration and comparison with GPS height changes and hydrology

Hydrological influences in long gravimetric data series

Detection of small hydrological variations in gravity by repeated observations with relative gravimeters

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