Natural and man-made induced hydrological signals, detected by high resolution tilt observations at the Geodynamic Observatory Moxa/Germany

Jahr, T.; Jentzsch, G.; Weise, A.

doi:10.1016/j.jog.2009.09.011

Cited by 15 publications

(8 citation statements)

References 10 publications

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“…While the tilmeter in 30m depths clearly shows the periodic signal of the solid earth tides, the tilt record of the instruments near to the surface is dominated by large non-periodic signals hydrological, thermoelastic and barometric origin. Several investigations have shown that the site and the installation depths of tiltmeters has a major impact on environmental noise mainly coming from hydrology [41], [43], [44], [42] has shown that even in 100 m depths effects caused by hydrological changes are detectable, but strongly reduced in comparison to a 50 m deep installation. First investigations related to topographic and temperature induced effects were carried out by [39] and [40].…”

Section: Sensor Propertiesmentioning

confidence: 99%

Measuring gravitomagnetic effects by a multi-ring-laser gyroscope

et al. 2011

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We propose an underground experiment to detect the general relativistic effects due to the curvature of space-time around the Earth (de Sitter effect) and to the rotation of the planet (dragging of the inertial frames or Lense-Thirring effect). It is based on the comparison between the IERS value of the Earth rotation vector and corresponding measurements obtained by a triaxial laser detector of rotation. The proposed detector consists of six large ring lasers arranged along three orthogonal axes. In about two years of data taking, the 1% sensitivity required for the measurement of the Lense-Thirring drag can be reached with square rings of 6 m side, assuming a shot noise limited sensitivity (20 prad/s/root Hz). The multigyros system, composed of rings whose planes are perpendicular to one or the other of three orthogonal axes, can be built in several ways. Here, we consider cubic and octahedral structures. It is shown that the symmetries of the proposed configurations provide mathematical relations that can be used to ensure the long term stability of the apparatus

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Section: Sensor Propertiesmentioning

confidence: 99%

Measuring gravitomagnetic effects by a multi-ring-laser gyroscope

et al. 2011

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“…Many scientists have modeled the effects of land-water distribution on the observed gravity (e.g., Francis et al, 2004;Abe et al, 2006;Boy and Hinderer, 2006;Meurers et al, 2007;Jahr et al, 2009;Leirião et al, 2009;Longuevergne et al, 2009;Nawa et al, 2009;Pfeffer et al, 2011). For example, Hanada et al (1990) found a simple proportional relationship between water level and abCopyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.…”

Section: Introductionmentioning

confidence: 99%

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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“…In contrast, relative deformation instruments like tiltmeters and strainmeters were introduced in an innovative way to apprehend both short‐ and long‐term subsurface flow phenomena, first in volcanology where the signal is strong due to large inflating cavities [ Dzurisin , ] and later in hydrogeology thanks to technical improvement of these instruments [ Boudin et al , ; Hisz et al , ]. In particular, much effort has been dedicated into assessing how they can be used to characterize properties of groundwater flow, whether fluxes are man driven [ Chen et al , ; Barbour and Wyatt , ; Fabian and Kümpel , ] or natural [ Braitenberg , ; Jahr et al , ]. Furthermore, tiltmeters are very efficient when it comes to capture transient responses to subsurface progressive pressure variation, which is a convenient way to spot productive zones without having the need for supplementary boreholes [ Vasco et al , ].…”

Section: Introductionmentioning

confidence: 99%

“…Well F30, located at a few hundreds of meters west from the pumping site, was used as the nonmoving reference point for the least squares adjustment of the optical leveling data. are man driven [Chen et al, 2010;Barbour and Wyatt, 2014;Fabian and Kümpel, 2003] or natural [Braitenberg, 1999;Jahr et al, 2009]. Furthermore, tiltmeters are very efficient when it comes to capture transient responses to subsurface progressive pressure variation, which is a convenient way to spot productive zones without having the need for supplementary boreholes [Vasco et al, 2001].…”

Section: Introductionmentioning

confidence: 99%

Inferring field‐scale properties of a fractured aquifer from ground surface deformation during a well test

Schuite

Longuevergne

Bour

et al. 2015

Geophysical Research Letters

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Fractured aquifers which bear valuable water resources are often difficult to characterize with classical hydrogeological tools due to their intrinsic heterogeneities. Here we implement ground surface deformation tools (tiltmetry and optical leveling) to monitor groundwater pressure changes induced by a classical hydraulic test at the Ploemeur observatory. By jointly analyzing complementary time constraining data (tilt) and spatially constraining data (vertical displacement), our results strongly suggest that the use of these surface deformation observations allows for estimating storativity and structural properties (dip, root depth, and lateral extension) of a large hydraulically active fracture, in good agreement with previous studies. Hence, we demonstrate that ground surface deformation is a useful addition to traditional hydrogeological techniques and opens possibilities for characterizing important large‐scale properties of fractured aquifers with short‐term well tests as a controlled forcing.

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Natural and man-made induced hydrological signals, detected by high resolution tilt observations at the Geodynamic Observatory Moxa/Germany

Abstract: It is well known, that high resolution borehole tiltmeters are able to observe deformations, The correlated tilt effect is discussed regarding changes of the tilt amplitude and the orientation of the induced pendulum tip movement during the load phase.

Cited by 15 publications

References 10 publications

Measuring gravitomagnetic effects by a multi-ring-laser gyroscope

Measuring gravitomagnetic effects by a multi-ring-laser gyroscope

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

Inferring field‐scale properties of a fractured aquifer from ground surface deformation during a well test

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