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首页> 外文期刊>Journal of geodynamics >Long-term and seasonal gravity changes at the Strasbourg station and their relation to crustal deformation and hydrology
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Long-term and seasonal gravity changes at the Strasbourg station and their relation to crustal deformation and hydrology

机译：史特拉斯堡站的长期和季节性重力变化及其与地壳变形和水文学的关系

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The time-varying gravity is observed at the Strasbourg station with super-conducting gravimeters (SG) since 1987, with a first record from 1987 to 1996 (GWR T005) and a second one in continuity from 1996 till now (GWR C026). The long-term behaviour of the SG is constrained by regular absolute gravity (AG) measurements, which are performed in parallel since 1989, first with the JILAg-5 instrument and later on with the FG5#206. Moreover, a permanent GPS station, which belongs to the French geodetic network, has been installed at the end of 1999. We will show that the AG measurements suggest that the gravity is slowly increasing in time at a rate of about 1.6 μGal/year, and besides, exhibits a quasi-annual component of several μGal variable amplitude. We present an analysis of the GPS data obtained at the SG station in the Rhine graben as well as at another regional station in the Vosges mountains distant by about 40 km in order to constrain the gravity contribution due to the vertical displacement of the station in the earth's gravity field (geometrical part). The tectonic context of the region is described and our first results from our two data sets of limited duration suggest a small subsidence of our station in the graben; however, this fact needs further confirmation when more geodetic data will be available. We also analyze the water table changes beneath the station (local scale) and in the Alsatian Plain (regional scale) to estimate the hydrological contributions from ground water to the gravity residual signal, and we show that some similarities exist between the gravity residuals and the hydrological contributions, especially for the seasonal terms. Other missing contributions of annual period (air mass motion in the atmosphere, ocean circulation, continental hydrology) have to be considered.
机译：自1987年以来，斯特拉斯堡站就使用超导重力仪（SG）观测到了随时间变化的重力，1987年至1996年是第一个记录（GWR T005），1996年至今是连续的第二个记录（GWR C026）。 SG的长期性能受到常规的绝对重力（AG）测量的约束，该测量自1989年以来并行进行，首先使用JILAg-5仪器，然后使用FG5＃206。此外，1999年底已安装了一个永久性的GPS站，该站属于法国大地测量网络。我们将显示AG的测量结果表明，重力以约1.6μGal/年的速度缓慢增加，此外，它还具有几μGal可变幅度的准年度分量。我们将对在莱茵河抓斗的SG站以及距离约40 km的孚日山脉的另一个区域站获得的GPS数据进行分析，以限制由于该站的垂直位移而引起的重力贡献。地球重力场（几何部分）。描述了该地区的构造背景，并且我们从两个持续时间有限的数据集中获得的第一个结果表明，我们的站点在the陷中的沉降很小。但是，当有更多大地测量数据可用时，这一事实需要进一步确认。我们还分析了站点下方（当地尺度）和阿尔萨斯平原（区域尺度）下的地下水位变化，以估算地下水对重力残差信号的水文贡献，并且我们发现重力残差与地下水位之间存在一些相似之处。水文贡献，特别是对于季节性而言。还需要考虑其他缺少的年度贡献（大气中的空气运动，海洋环流，大陆水文学）。

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