The Large Ring Laser G for Continuous Earth Rotation Monitoring

Schreiber, K. U.; Klügel, Thomas; Velikoseltsev, A.; Schlüter, Wolfgang; Stedman, Geoffrey; Wells, J.‐P. R.

doi:10.1007/s00024-004-0490-4

Cited by 63 publications

(53 citation statements)

References 9 publications

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“…G is a square, 4 m side, mounted on a monolithic zerodur (an extremely rigid and thermally stable ceramic material) slab, and located in a laboratory under an artificial mound in order to screen the device from superficial rotational noise. The laser power is 20nW; G has already achieved a sensitivity of a few pHz and is able to reveal the diurnal polar motion of the axis of the earth [9].…”

Section: Existing Ring Lasersmentioning

confidence: 99%

Light and/or atomic beams to detect ultraweak gravitational effects

Tartaglia

Belfi

Beverini

et al. 2014

EPJ Web of Conferences

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Abstract. We shall review the opportunities lent by ring lasers and atomic beams interferometry in order to reveal gravitomagnetic effects on Earth. Both techniques are based on the asymmetric propagation of waves in the gravitational field of a rotating mass; actually the times of flight for co-or counter-rotating closed paths turn out to be different. After discussing properties and limitations of the two approaches we shall describe the proposed GINGER experiment which is being developed for the Gran Sasso National Laboratories in Italy. The experimental apparatus will consist of a three-dimensional array of square rings, 6m × 6m, that is planned to reach a sensitivity in the order of 1prad/ √ Hertz or better. This sensitivity would be one order of magnitude better than the best existing ring, which is the G-ring in Wettzell, Bavaria, and would allow for the terrestrial detection of the Lense-Thirring effect and possibly of deviations from General Relativity. The possibility of using either the ring laser approach or atomic interferometry in a space mission will also be considered. The technology problems are under experimental study using both the German G-ring and the smaller G-Pisa ring, located at the Gran Sasso.

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Section: Existing Ring Lasersmentioning

confidence: 99%

Light and/or atomic beams to detect ultraweak gravitational effects

Tartaglia

Belfi

Beverini

et al. 2014

EPJ Web of Conferences

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“…Since then, many scientists commended the benefits of studying rotational ground motions for Earth sciences (Twiss et al, 1993;Spudich et al, 1995;Takeo and Ito, 1997;Igel et al, 2007;Igel, 2009), physics (DeSalvo, 2009;Lantz et al, 2009), and also for engineering applications (Trifunac, 2009). In the last years, new instruments, e.g., ring-laser technology (Schreiber et al, 2009;Velikoseltsev et al, 2012) or adapted gyroscopes (Bernauer et al, 2012), that are capable of measuring rotational motions with a much higher precision have been developed and possibly bring new insight into seismological applications.…”

Section: Introductionmentioning

confidence: 99%

Improved finite-source inversion through joint measurements of rotational and translational ground motions: a numerical study

Reinwald¹,

Bernauer

Igel

et al. 2016

Solid Earth

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Abstract. With the prospects of seismic equipment being able to measure rotational ground motions in a wide frequency and amplitude range in the near future, we engage in the question of how this type of ground motion observation can be used to solve the seismic source inverse problem. In this paper, we focus on the question of whether finite-source inversion can benefit from additional observations of rotational motion. Keeping the overall number of traces constant, we compare observations from a surface seismic network with 44 three-component translational sensors (classic seismometers) with those obtained with 22 sixcomponent sensors (with additional three-component rotational motions). Synthetic seismograms are calculated for known finite-source properties. The corresponding inverse problem is posed in a probabilistic way using the Shannon information content to measure how the observations constrain the seismic source properties. We minimize the influence of the source receiver geometry around the fault by statistically analyzing six-component inversions with a random distribution of receivers. Since our previous results are achieved with a regular spacing of the receivers, we try to answer the question of whether the results are dependent on the spatial distribution of the receivers. The results show that with the six-component subnetworks, kinematic source inversions for source properties (such as rupture velocity, rise time, and slip amplitudes) are not only equally successful (even that would be beneficial because of the substantially reduced logistics installing half the sensors) but also statistically inversions for some source properties are almost always improved. This can be attributed to the fact that the (in particular vertical) gradient information is contained in the additional motion components. We compare these effects for strike-slip and normal-faulting type sources and confirm that the increase in inversion quality for kinematic source parameters is even higher for the normal fault. This indicates that the inversion benefits from the additional information provided by the horizontal rotation rates, i.e., information about the vertical displacement gradient.

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“…In recent years the Gross Ring G of the Geodesy Observatory of Wettzell has obtained top level results: as far as the Earth rotation rate is concerned it is a factor 3-4 far from the precision of 1 part in 10 9 , and its data are used in IERS to reduce the error in the evaluation of the fast component of LOD [8,9]. Starting from the experience of G, it has been possible to deduce that the development of a high sensitivity RL requires:…”

Section: Introductionmentioning

confidence: 99%

The GINGER Project and status of the ringlaser of LNGS

Virgilio

Ruggiero²

2016

Proceedings of XVI International Workshop on Neutrino Telescopes — PoS(NEUTEL2015)

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A ring-laser attached to the Earth measures the absolute angular velocity of the Earth summed to the relativistic precessions, de Sitter and Lense-Thirring. GINGER (Gyroscopes IN GEneral Relativity) is a project aiming at measuring the LenseThirring effect with a ground based detector; it is based on an array of ring-lasers. Comparing the Earth angular velocity measured by IERS and the measurement done with the GINGER array, the Lense-Thirring effect can be evaluated. Compared to the existing space experiments, GINGER provides a local measurement, not the averaged value and it is unnecessary to model the gravitational field. It is a proposal, but it is not far from being a reality. In fact the GrossRing G of the Geodesy Observatory of Wettzell has a sensitivity very close to the necessary one. G of Wettzell is part of the IERS system which provides the measure of the Length Of the DAY (LOD); G provides information on the fast component of LOD. In the last few years, a roadmap toward GINGER has been outlined.

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The Large Ring Laser G for Continuous Earth Rotation Monitoring

Cited by 63 publications

References 9 publications

Light and/or atomic beams to detect ultraweak gravitational effects

Light and/or atomic beams to detect ultraweak gravitational effects

Improved finite-source inversion through joint measurements of rotational and translational ground motions: a numerical study

The GINGER Project and status of the ringlaser of LNGS

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