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A two-year analysis of the iOSG-24 superconducting gravimeter at the low noise underground laboratory (LSBB URL) of Rustrel, France: Environmental noise estimate

机译:法国Rustrust的低噪声地下实验室(LSBB URL)对iOSG-24超导重力仪的两年分析:环境噪声估计

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Since July 2015 a Superconducting Gravimeter (SG) of the latest generation, the iOSG-24, has been recording continuously the time-varying gravity field at the low noise underground laboratory (LSBB URL) of Rustrel, France. This instrument designed for observatory purpose has a levitated Niobium sphere weighting 17.7 g instead of 4.3 g. The advantage of increasing the mass of the sphere is to reduce the thermal noise due to Brownian motion inside the sensor. A comparison of the noise levels shows that the combination of this iOSG-24 with the environmental condition at the LSBB makes this site one of the quietest worldwide SG sites. Parallel measurements with an absolute FG5 gravimeter give a calibration factor of -451 +/- 3 nm/s(2)/V and a negligible linear drift is observed 3 months after the installation. Tidal analyses are consistent with theoretical predictions and have shown a strong S1 thermal wave. Influence of the hydrological water content, mostly related to the Fontaine de Vaucluse catchment, is clearly visible on the SG residuals after tides removal. However the hydrological influence modelled using the MERRA2 products does not fully explain the observed noise level at periods between 1 and 10 days. Longer gravimetric time-series are necessary to further study the seasonal hydrological effects.
机译:自2015年7月以来,最新一代的超导重力仪(SG)iOSG-24在法国Rustrel的低噪声地下实验室(LSBB URL)上连续记录时变重力场。该仪器用于观测目的,其悬浮的铌球重量为17.7 g,而不是4.3 g。增加球体质量的优点是减少由于传感器内部的布朗运动引起的热噪声。噪声水平的比较显示,此iOSG-24与LSBB的环境条件相结合,使该站点成为全球最安静的SG站点之一。使用绝对FG5重力仪进行的平行测量得出的校准系数为-451 +/- 3 nm / s(2)/ V,安装后3个月观察到的线性漂移可忽略不计。潮汐分析与理论预测一致,并显示出强烈的S1热浪。潮汐去除后,SG残留物上清晰可见水文水分含量的影响,主要与枫丹白露流域汇水有关。但是,使用MERRA2产品建模的水文影响不能完全解释1到10天之间观测到的噪声水平。需要更长的重力时间序列才能进一步研究季节性水文影响。

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