Very high resolution long-baseline water-tube tiltmeter to record small signals from Earth free oscillations up to secular tilts

d’Oreye, Nicolas; Zürn, W.

doi:10.1063/1.1844451

Cited by 31 publications

(26 citation statements)

References 35 publications

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“…The power-law ground drifts have also been observed in the measurements with a 43-m-long floatless water-tube tiltmeter which has been in operation since 1997 at the Walferdange Underground Laboratory for Geodynamics in the Grand Duchy of Luxembourg [44]. The instrument's very low noise level and its high resolution up to the longperiod seismic band (where for instance the resolution is better than 5 Â 10 À12 rad) allow the successful recording of minuscule drifts as well as rarely observed grave toroidal and spheroidal free oscillations of the Earth excited by major earthquakes.…”

Section: Hls Measurements In Luxembourgmentioning

confidence: 70%

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Review of observations of ground diffusion in space and in time and fractal model of ground motion

Shiltsev

2010

Phys. Rev. ST Accel. Beams

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We present numerous observations of the diffusive motion of the ground and tunnels for scientific instruments and show that if systematic movements are excluded the remaining uncorrelated component of the motion obeys a characteristic fractal law with the displacement variance dY 2 scaling with time and spatial intervals T and L as dY 2 / T L with both exponents close to 1 ( % % 1). We briefly describe experimental methods of the mesoscopic and microscopic ground motion detection used in measurements at physics research facilities sensitive to ground motion, particularly large high energy elementary particle accelerators. A simple mathematical model of the fractal motion demonstrating the observed scaling law is also presented and discussed. This paper is a subsequent full detail publication to [V. Shiltsev, Phys.

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Section: Hls Measurements In Luxembourgmentioning

confidence: 70%

“…Shaded rectangles pinpoint the frequencies ranges of the Earth tides and the Earth free modes (from Ref. [44]). spatial intervals does not allow one to confirm or to reject the L dependence of the variance.…”

Section: A Proton West Tunnel At Fnalmentioning

confidence: 99%

Review of observations of ground diffusion in space and in time and fractal model of ground motion

Shiltsev

2010

Phys. Rev. ST Accel. Beams

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“…Tiltmeters, and in particular long‐base tiltmeters, have been primarily designed for monitoring deformation in various contexts [ Agnew , 1986], such as volcanoes (for a review, see, e.g., Dzurisin [2003]), gas fields [e.g., Sleeman et al , 2000], tunnelling [e.g., Feldman et al , 1998], mining [e.g., Chrzanowski et al , 1986], Earth tide studies [e.g., Melchior , 1983; Zürn et al , 1986], postglacial rebound [e.g., Kääriäinen , 1979] and tectonic crustal deformation [e.g., Wyatt et al , 1994; Anderson et al , 1997]. However, some instruments have achieved very low noise levels in a wide frequency range, allowing observations in the normal mode frequency band [e.g., Zürn et al , 1999, 2000; d'Oreye and Zürn , 2005; Braitenberg et al , 2006]. These instruments are relatively inexpensive since they do not require a sophisticated mechanical design.…”

Section: Introductionmentioning

confidence: 99%

“…These instruments are relatively inexpensive since they do not require a sophisticated mechanical design. For example, the water tube tiltmeter devised by d'Oreye and Zürn [2005] only requires aluminum pots, circular aluminum capacitive plates, polyethylene tubes, water and some silicone oil. The only relevant costs are associated with the data acquisition system and with the preparation of the site for installation, if necessary.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we compare long‐period data from the long‐base capacitive water tube tiltmeter WTH2O at Walferdange, Grand Duchy of Luxembourg [ d'Oreye and Zürn , 2005] with records from seismometers at two seismic stations nearby: WLF (GEOFON network) at Walferdange, and BFO (IRIS network) at the Black Forest Observatory, Schiltach, Germany. BFO also operates a long‐base differential pressure fluid tiltmeter, HF3, so we will also show data from this instrument.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of fluid tiltmeter data with long‐period seismograms: Surface waves and Earth's free oscillations

et al. 2006

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We compare observations of long‐period seismic surface waves and free oscillations recorded by high‐resolution long‐base fluid tube tiltmeters and by nearby broadband seismometers after large earthquakes. The quality of the tiltmeter data is comparable to that of the best horizontal component seismic data, recording some of the gravest free oscillations of the Earth, as well as successive passages of seismic surface waves circling the globe. We compare the observations with theoretical seismograms and with theoretical tilt. The predicted and observed surface wave tilt waveforms are very similar provided that we take into account horizontal acceleration effects on the tiltmeter. Phase and amplitude anomalies between the waveforms are well explained by the theoretical transfer function of the instrument. Likewise, observed horizontal seismograms converted into tilt match the tiltmeter data very well. Long‐base fluid tube tiltmeters could potentially contribute to obtain high‐quality measurements of the long‐period seismic spectrum.

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Mechanical Accelerometers

Barone

Giordano

2015

Wiley Encyclopedia of Electrical and Electronics Engineering

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Modern mechanical accelerometers are the result of more than a century of research and development aimed at optimizing the mechanical architectures of classical oscillators (simple pendulum, inverted pendulum, and spring–mass oscillator) as well as careful and effective applications of technology improvements and the introduction of innovative techniques of control and signal readout. A further strong impulse to the development of mechanical accelerometers came from interferometric detectors of gravitational waves, which require accelerometers able to satisfy very stringent specifications on sensitivity, bandwidth, resonance frequency, directivity, compactness, and weight, for applications both in air and in ultrahigh vacuum (UHV) and cryogenics. Among the different mechanical architectures present in literature, the Watt's linkage is one of the most promising ones for the implementation of a new class of mechanical accelerometers (horizontal, vertical, and angular). In this article, a simplified analytical model for a global description of the mechanical behavior and of the sensitivity limits of Watt's linkage‐based mechanical accelerometers is presented and discussed, with respect to methods and techniques for their optimization. State‐of‐the‐art architectures and implementations are also presented, together with selected results of laboratory tests and scientific applications, which show the impressive performances and not yet explored potentialities of this class of mechanical accelerometers.

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Very high resolution long-baseline water-tube tiltmeter to record small signals from Earth free oscillations up to secular tilts

Cited by 31 publications

References 35 publications

Review of observations of ground diffusion in space and in time and fractal model of ground motion

Review of observations of ground diffusion in space and in time and fractal model of ground motion

Comparison of fluid tiltmeter data with long‐period seismograms: Surface waves and Earth's free oscillations

Mechanical Accelerometers

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