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首页> 外文期刊>Journal of geodynamics >Crustal vertical motion along a profile crossing the Rhine graben from the Vosges to the Black Forest Mountains: Results from absolute gravity, GPS and levelling observations
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Crustal vertical motion along a profile crossing the Rhine graben from the Vosges to the Black Forest Mountains: Results from absolute gravity, GPS and levelling observations

机译：沿着从孚日到黑森林山脉的莱茵河横断面的地壳垂直运动：绝对重力，GPS和水平仪观测的结果

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The Rhine plain is oriented north-south and limited by the Vosges Mountains (France) to the West and the Black Forest Mountains (Germany) to the East. The present-day tectonic evolution of this system is not well known and many questions are still pending: is the graben subsiding? Are the mountains uplifting? What is the relative behaviour of the three different geological components? In attempting to answer these questions, we compare for the first time in this region time series of absolute gravity (AG) measurements to the available GPS observations at three sites along a profile crossing the Rhine graben. Our reference station is the gravimetric observatory near Strasbourg (J9), located in the Rhine plain where AG measurements are performed regularly since 1997 and where superconducting gravimeter (SG) observations are available almost continuously for 17 years. The secondary sites are the Welschbruch station in the Vosges Mountains where six AG measurements have been conducted since 1997 and the Black Forest Observatory (BFO) where three AG measurements are available. GPS permanent receivers are collocated at the Strasbourg-J9 site since 1999, at the Welschbruch station since 2000, and at BFO since 2002. Levelling data are only available in the BFO region. We compare the long term content of two types of geodetic measurements with special emphasis on the trend despite the limited duration of our data sets. Assuming that the gravity changes are linear in time, we obtain g = 1.9 ± 0.2 μGal/yr at Strasbourg-J9, g = -0.96 ± 0.2 μGal/yr at Welschbruch site and g = 2.5 ± 0.5 μGal/yr at BFO. The trends according to GPS observations are, respectively: - 1.51 ±0.07 and - 0.74 ±0.10 mm/yr at Strasbourg-J9 and Welschbruch site, respectively; there is no GPS result available at BFO. The AG results for BFO are very questionable, as well as the GPS observations at the Welschbruch station. Nonetheless, Strasbourg-J9 and Welschbruch AG measurements lead to subsidence and uplift, respectively, which are expected results in agreement with GPS at Strasbourg-J9.
机译：莱茵河平原以北为南向，西部受孚日山脉（法国）限制，东部受黑森林山脉（德国）限制。该系统目前的构造演化还不为人所知，许多问题仍在悬而未决：grab住了吗？山在抬头吗？三种不同地质成分的相对行为是什么？在试图回答这些问题时，我们首次在该区域的绝对重力（AG）测量时间序列与沿莱茵河横断面的三个位置的GPS观测值进行了比较。我们的参考站是位于斯特拉斯堡（J9）附近的重力观测站，位于莱茵河平原，自1997年以来就定期进行AG测量，并且超导重力仪（SG）观测几乎可以连续进行17年。次要站点是孚日山脉的Welschbruch站，自1997年以来已进行了6次AG测量，而黑森林天文台（BFO）则进行了3次AG测量。自1999年以来，GPS永久性接收器就安装在斯特拉斯堡J9站点上，2000年以来并置在Welschbruch站上，而2002年以来则部署在BFO上。水准仪数据仅在BFO地区可用。尽管我们的数据集持续时间有限，但我们比较了两种大地测量的长期内容，并特别强调了趋势。假设重力变化随时间呈线性变化，我们在斯特拉斯堡-J9处获得g = 1.9±0.2μGal/ yr，在Welschbruch站点获得g = -0.96±0.2μGal/ yr，在BFO获得g = 2.5±0.5μGal/ yr。根据GPS观测的趋势分别为：-Strasbourg-J9和Welschbruch站点分别为-1.51±0.07和-0.74±0.10 mm / yr； BFO没有可用的GPS结果。 BFO的AG结果以及Welschbruch站的GPS观测都令人质疑。尽管如此，斯特拉斯堡J9和Welschbruch AG的测量结果分别导致沉降和隆起，这是与斯特拉斯堡J9的GPS一致的预期结果。

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