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首页> 外文期刊>Journal of geodynamics >Quarter-diurnal tides observed with a long-base water-tube tiltmeter in the Grand Duchy of Luxembourg
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Quarter-diurnal tides observed with a long-base water-tube tiltmeter in the Grand Duchy of Luxembourg

机译：在卢森堡大公国使用长基水管倾角计观测到的季度潮汐

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摘要

We analyzed 7 years of Earth tide measurements performed with a 43 m long water-tube tiltmeter in the Underground Laboratory for Geodynamics in Walferdange (Luxembourg). The high performances of this instrument lead to diurnal and semi-diurnal tidal measurements in excellent accordance with the models. The results of the Earth tide harmonic analysis show the lowest standard deviations (STDV) among all the results obtained with other tiltmeters in Walferdange. For instance, the high signal-to-noise ratio (SNR) allows an estimation of the amplitude of the M_2 wave with a STDV as small as 3 μasec (i.e., a SNR of 1700 for this wave) and a phase uncertainty less than 0.024°, which represents 3 s only. In addition it was possible to successfully separate and obtain a significant estimate of some of the small constituents of the ter-and quarter-diurnal bands such as 2MK_3, M_3, MN_4, M_4 and MS_4. The presence of these very small waves (with amplitudes of less than a few microarcseconds) is most likely due to the effects of the shallow-water tides known to be remarkable in the North Sea (distance of 300 km). This represents the first clear observation of tilt induced by the non-linear tides in the North Sea and it might become a complementary tool for the validation of non-linear tide models.
机译：我们分析了Walferdange（卢森堡）地下动力学地下实验室使用43 m长的水管倾斜仪进行的7年潮汐测量。该仪器的高性能可根据模型对昼夜和半昼间的潮汐进行测量。在使用Walferdange的其他倾斜仪获得的所有结果中，潮汐谐波分析的结果显示出最低的标准偏差（STDV）。例如，高信噪比（SNR）允许使用STDV小至3μasec（即该波的SNR为1700）和相位不确定度小于0.024的M_2波的幅度进行估计°，仅代表3 s。另外，有可能成功地分离并获得三级和四分之一日波段的一些小组成部分的重要估计值，例如2MK_3，M_3，MN_4，M_4和MS_4。由于已知在北海（距离300公里）引人注目的浅水潮的影响，这些极小波（振幅小于几微秒）的存在最有可能。这代表了北海非线性潮汐引起的倾斜的第一个清晰观测结果，它可能成为验证非线性潮汐模型的补充工具。

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