Underground Gravity Survey in Alpine Regions*

Hussain, A.; Walach, Georg; Weber, Florence R.

doi:10.1111/j.1365-2478.1981.tb01021.x

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…The gravity difference between two depths can be used to determine the apparent density structure between these depths, assuming that the homogeneous layered approximation discussed in is valid. This technique has been used in mine shafts (Hussain et al 1981) and in boreholes (LaFehr 1983; Kasameyer & Hearst 1988). The apparent density derived from Δ STD g is obtained from , using the fact that the terrain effect is a linear function of density: …”

Section: Mean Reservoir Properties From Std Gravity and Core Samplementioning

confidence: 99%

Time-lapse surface to depth gravity measurements on a karst system reveal the dominant role of the epikarst as a water storage entity

Jacob

Chéry

Bayer

et al. 2009

Geophysical Journal International

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International audienceIn this study we attempt to understand the water storage variations in a karst aquifer on the Larzac Plateau (South of France) using ground-based gravimetry. Surface to 60 m depth gravity measurements are performed three times a year since 2006 down a pothole, in complement to monthly absolute gravity (AG) measurements at three sites. The time variations of the surface to depth (STD) gravity differences are compared with the AG variations. Using a simple Bouguer plate model, we find that the STD gravity differences are very similar to the AG variations. The STD gravity differences are then used to determine apparent density values. These integrative density values are compared with measured grain densities from core samples to obtain an apparent porosity and saturation change representative of the investigated depth. The apparent porosity ranges from 4.8 to 7.3 per cent. We then discuss on the repartition of the apparent physical properties with respect to the epikarst and infiltration zone karst structures. We argue that AG and STD differences monitor epikarst water storage variations. Within this scope, we discuss the fact that seasonal scale water storage variation occurs predominantly in the epikarst

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Section: Mean Reservoir Properties From Std Gravity and Core Samplementioning

confidence: 99%

Time-lapse surface to depth gravity measurements on a karst system reveal the dominant role of the epikarst as a water storage entity

Jacob

Chéry

Bayer

et al. 2009

Geophysical Journal International

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“…Terrain corrections for surface and subsurface (Hearst, 1968) stations were calculated. Corrections for the mine galleries were calculated using formula by Hussain (Hussain et al 1981).…”

Section: Underground Gravity Survey In "Trbovlje -Hrastnik" Coal Minementioning

confidence: 99%

Underground gravity survey in a coal mine

Vasiljević¹,

Vučković²,

Sretenović³

2014

Pod Rad

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Underground gravity surveys are usually conducted in order to define geological structures and to locate and delineate ore bodies. In the coal mines, on the other hand, these surveys are often applied in solving stability and safety problems of the mine. Basic principals of underground gravity measurements and examples of application in coal mining are presented. Complex geophysical and geological investigations were conducted in a wider area of the coal mine "Trbovlje -Hrastnik" (Slovenia) in purpose to define geological features and delineate potentially dangerous zones, connected to the subsidence, rockslides and water penetrations into exploitation galleries of the mine. Gravity and microtremor measurements were conducted in the mine galleries. Compilation and interpretation of subsurface gravity anomaly maps and interval density map is presented.

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“…Capuano et al, 1998 ; Zahorec & Papčo, 2018 ) and/or from mines and boreholes (e.g. Hammer, 1950 ; Hinze et al, 1978 ; Hussain et al, 1981 ) have proven to be a valuable and non-invasive source of complementary information when targeting shallow crustal density contrasts below the surface.…”

Section: Introductionmentioning

confidence: 99%

A gravimetric assessment of the Gotthard Base Tunnel geological model: insights from a novel gravity terrain-adaptation correction and rock physics data

et al. 2022

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The Gotthard Base Tunnel (GBT) is a 57 km long railway tunnel, constructed in the Central Alps in Switzerland and extending mainly North–South across numerous geological units. We acquired 80 new gravity data points at the surface along the GBT profile and used 77 gravity measurements in the tunnel to test and constrain the shallow crustal, km-scale geological model established during the tunnel construction. To this end, we developed a novel processing scheme, which computes a fully 3D, density-dependent gravity terrain-adaptation correction (TAC), to consistently compare the gravity observations with the 2D geological model structure; the latter converted into a density model. This approach allowed to explore and quantify candidate rock density distributions along the GBT modelled profile in a computationally-efficient manner, and to test whether a reasonable fit can be found without structural modification of the geological model. The tested density data for the various lithologies were compiled from the SAPHYR rock physical property database. The tested models were evaluated both in terms of misfit between observed and synthetic gravity data, and also in terms of correlation between misfit trend and topography of the target profile. The results indicate that the locally sampled densities provide a better fit to the data for the considered lithologies, rather than density data averaged over a wider set of Alpine rock samples for the same lithology. Furthermore, using one homogeneous and constant density value for all the topographic corrections does not provide an optimal fit to the data, which instead confirms density variations along the profile. Structurally, a satisfactory fit could be found without modifying the 2D geological model, which thus can be considered gravimetry-proof. From a more general perspective, the gravity data processing routines and the density-dependent corrections developed in this case study represent a remarkable potential for further high-resolution gravity investigations of geological structures.

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Underground Gravity Survey in Alpine Regions*

Cited by 10 publications

References 15 publications

Time-lapse surface to depth gravity measurements on a karst system reveal the dominant role of the epikarst as a water storage entity

Time-lapse surface to depth gravity measurements on a karst system reveal the dominant role of the epikarst as a water storage entity

Underground gravity survey in a coal mine

A gravimetric assessment of the Gotthard Base Tunnel geological model: insights from a novel gravity terrain-adaptation correction and rock physics data

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