NDLI: Local seasonal gravity changes in the Lower Rhine Embayment, Germany

Content Provider	Springer Nature Link
Author	Kümpel, H. J. Campbell, J. Keysers, Ch. J.
Copyright Year	2001
Abstract	Repeated high resolution gravity measurements with LaCoste and Romberg gravity meters have been carried out for nearly two years in the Lower Rhine Embayment, Germany. In the long run, the observations aim at detecting long term gravity changes that are associated with surface subsidence due to groundwater withdrawal in a nearby browncoal mining area. Concurrently, short term gravity variations on local scales are also investigated to find out their influence on long term gravity observations. For that reason, two local networks with extensions of a few kilometers each have been set up, one of them across an active fault where presently large height changes are occurring (up to 2.2 cm/a), the other one in a stable intra-block site showing no changes of height. The gravity data, so far, do not reveal any significant long term changes. However, seasonal variations of up to 500 nms$^{−2}$ are observed between stations on both sides of a steeply dipping tectonic fault. This is where significant height changes due to ground water withdrawal occur, while gravity differences between stations on the same side of that fault as well as the observations in the other network remain constant throughout the observation period. The physical reason for the gravity variations is not yet clear. We assume, that different types of vegetation and soil cause seasonal changes in soil moisture, and thus in subsurface density. This study emphasizes that stations for repeated high precision gravity observations (aiming e. g. to detect seismogenic precursory anomalies) may be largely influenced by local, effects of presumably hydrological origin and that networks even on the 100 m scale can considerably suffer from systematic distortions.
Starting Page	313
Ending Page	326
Page Count	14
File Format	PDF
ISSN	12178977
Journal	Acta Geodaetica et Geophysica Hungarica
Volume Number	36
Issue Number	3
e-ISSN	15871037
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-27
Publisher Institution	Quarterly of the Hungarian Academy of Sciences
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	hydrological influence subsidence gravimetry Geophysics/Geodesy gravity variations
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geology Geophysics

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