Effect of underground water on gravity observation at Matsushiro, Japan

Imanishi, Yuichi; Kokubo, Kazuya; Tatehata, Hidee

doi:10.1016/j.jog.2005.08.031

Cited by 49 publications

(49 citation statements)

References 8 publications

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“…Imanishi et al (2006) reproduced land-water distribution effects observed at Matsushiro, central Japan, with an empirical tank model, assuming an instant gravity response to precipitation of −0.040 µgal/mm and a linear gravity recovery after precipitation of +3 × 10 −6 µgal/s. Wziontek et al (2009) explained a seasonal gravity change of ∼10 µgal peak-to-peak at superconducting gravity stations in Europe by attraction and loading effects attributable to global land-water distributions.…”

Section: Introductionmentioning

confidence: 94%

“…pirical models A number of researchers have predicted changes in gravity due to variations in land-water distributions through empirical models, by assuming a simple gravity response to the water plane thickness (e.g., Imanishi et al, 2006;Nawa et al, 2009). However, water flow is governed by nonlinear equations (Eq.…”

Section: Comparison Between the Physical Model And Em-mentioning

confidence: 99%

“…Firstly, the majority of models, including the tank model, assume a linear gravity response to precipitation (e.g., Hanada et al, 1990;Imanishi et al, 2006;Nawa et al, 2009;Lampitelli and Francis, 2010). Since water flow is governed by non-linear equations (as demonstrated in this study), there are limitations in applying linear theory to gravity responses (Kazama et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

et al. 2012

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Gravity changes associated with variations in local land-water distributions have been observed at Isawa Fan in northern Japan, and modeled by hydrological equations. We solve the Richards equation numerically for the time variation in the vertical soil moisture distribution, which is then spatially integrated to estimate gravity changes due to the soil moisture distribution. In modeling Isawa Fan, we assume a simple hydrological model: a horizontally homogeneous soil in an infinite half-space. The estimated gravity is consistent with the observed gravity during a 50-day period within about 0.4 µgal root mean square, owing to both observed soil parameter values and the observation building geometry being incorporated into the hydrological model. However, the estimated gravity cannot fully reproduce annual gravity changes observed during a 2-year time frame, because the boundary conditions in the modeling determine only local water distributions and the resultant short-period gravity changes. Instead, the observed gravity over these 2 years can be reproduced within about 1.0 µgal root mean square, if the additional parameters of the annual gravity change (A ac and A as ) and the snowfall effect (A s ) are calculated by the function regression to the observed gravity with the least-squares method. The hydrological modeling techniques presented here can be utilized at all gravity sites in flat areas similar to Isawa Fan, such that hydrological effects in gravity data can be corrected and mass transfers associated with earthquakes and volcanoes can be monitored.

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Section: Introductionmentioning

confidence: 94%

Section: Comparison Between the Physical Model And Em-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

et al. 2012

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“…Recent studies regarding the reduction of hydrological effects in gravity observations (Boy and Hinderer, 2006;Harnisch and Harnisch, 2006;Hokkanen et al, 2007a,b;Imanishi et al, 2006;Kroner and Jahr, 2006;Van Camp et al, 2006) emphasise that, in particular, local hydrological fluctuations have a major effect on geodynamic observations. The close vicinity of the station (< 100 m) may play a crucial role.…”

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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“…Kroner, 2001;Imanishi et al, 2006;Van Camp et al, 2006). In the case of the Imanishi et al (2004) study, the coseismic signal at Matsushiro could be detected because they applied a rainfall correction to the observed gravity data (Supporting Online Material of Imanishi et al, 2004Imanishi et al, , 2006.…”

Section: Introductionmentioning

confidence: 99%

Coseismic change and precipitation effect in temporal gravity variation at Inuyama, Japan: A case of the 2004 off the Kii peninsula earthquakes observed with a superconducting gravimeter

Nawa

Suda

Yamada

et al. 2009

Journal of Geodynamics

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Effect of underground water on gravity observation at Matsushiro, Japan

Cited by 49 publications

References 8 publications

Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

Gravity changes associated with variations in local land-water distributions: Observations and hydrological modeling at Isawa Fan, northern Japan

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

Coseismic change and precipitation effect in temporal gravity variation at Inuyama, Japan: A case of the 2004 off the Kii peninsula earthquakes observed with a superconducting gravimeter

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