Reconstruction of the Instantaneous Earth Rotation Vector with Sub-Arcsecond Resolution Using a Large Scale Ring Laser Array

Gebauer, André; Tercjak, Monika; Schreiber, K. U.; Igel, Heiner; Kodet, Jan; Hugentobler, Urs; Wassermann, Joachim; Bernauer, Felix; Lin, Chin‐Jen; Donner, Stefanie; Egdorf, Sven; Simonelli, Andreino; Wells, Jon‐Paul R.

doi:10.1103/physrevlett.125.033605

Cited by 42 publications

(36 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The level of accuracy of the concrete construction was such that the mechanical degrees of freedom of the ring laser hardware (in particular the corner boxes and the movable mirrors) where such that for all four rings the optical paths could be established allowing the Sagnac effect to be observed. As a consequence the ground-based reconstruction of the entire vector of Earth rotation was possible with high accuracy (Gebauer et al, 2020). For seismology, ROMY -combined with the collocated broadband STS2 sensor (FUR)…”

Section: Discussionmentioning

confidence: 99%

“…At appropriate resolution the ground-based observations of the Earth's full rotation vector certainly would be a desired complement to VLBI (e.g., Mendes Cerveira et al, 2009). Gebauer et al (2020) report a first discussion of the initial ROMY ring laser performance with respect to geodetic requirements. Over a length of 47 days, a long-term sensor stability of ∆Ω/Ω = 5 × 10 −5 -where Ω is Earth's rotation rate -could be achieved.…”

Section: Earth's Rotationmentioning

confidence: 99%

“…This motivates the devel-opment of an (at least) three-component ring laser sensor that allows for the recovery of the complete vector of Earth's rotation. In addition to directly measuring changes in Earth's rotation rate and polar motion (e.g., Schreiber et al, 2004), it has been argued that ring laser measurements of the complete rotation vector ideally complement classic VLBI (Very Long Baseline Interferometry) observations (e.g., Mendes Cerveira et al, 2009;Gebauer et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

ROMY: A Multi-Component Ring Laser for Geodesy and Geophysics

Igel¹,

Schreiber²,

Gebauer³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Single-component ring lasers have provided high-resolution observations of Earth's rotation rate as well as local earthquake-or otherwise-induced rotational ground motions. Here we present the design, construction, and operational aspects of ROMY, a four-component, tetrahedral-shaped ring laser installed at the Geophysical Observatory Fürstenfeldbruck near Munich, Germany. Four equilateral, triangular-shaped ring lasers with 12 m side length provide rotational motions that can be combined to construct the complete vector of Earth's rotation from a point measurement with very high resolution. Combined with a classic broadband seismometer we obtain the most accurate 6 degree-of-freedom ground motion measurement system to date, enabling local and teleseismic observations as well as the analysis of ocean-generated Love and Rayleigh waves. The specific design and construction details are discussed as are the resulting consequences for permanent observations. We present seismic observations of local, regional, and global earthquakes as well as seasonal variations of oceangenerated rotation noise. The current resolution of polar motion is discussed and strategies how to further improve long-term stability of the multi-component ring-laser system are presented.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Earth's Rotationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

ROMY: A Multi-Component Ring Laser for Geodesy and Geophysics

Igel¹,

Schreiber²,

Gebauer³

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…On 23 January 2018, a magnitude 7.9 earthquake occurred in the gulf of Alaska. Seismic waves of the event were recorded on the newly-opened multi-component ring laser observatory ROMY in Fürstenfeldbruck, Germany [66,67], resulting in the first direct observations of all six degrees of freedom of ground motion of a teleseism. The recorded data is shown in Figure 2.…”

Section: Example: Tutorial On 6dof Processing Using the 2018 Gulf Of mentioning

confidence: 99%

Seismological Processing of Six Degree-of-Freedom Ground-Motion Data

Sollberger

Igel

Schmelzbach

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

Recent progress in rotational sensor technology has made it possible to directly measure rotational ground-motion induced by seismic waves. When combined with conventional inertial seismometer recordings, the new sensors allow one to locally observe six degrees of freedom (6DOF) of ground-motion, composed of three orthogonal components of translational motion and three orthogonal components of rotational motion. The applications of such 6DOF measurements are manifold—ranging from wavefield characterization, separation, and reconstruction to the reduction of non-uniqueness in seismic inverse problems—and have the potential to revolutionize the way seismic data are acquired and processed. However, the seismological community has yet to embrace rotational ground-motion as a new observable. The aim of this paper is to give a high-level introduction into the field of 6DOF seismology using illustrative examples and to summarize recent progress made in this relatively young field. It is intended for readers with a general background in seismology. In order to illustrate the seismological value of rotational ground-motion data, we provide the first-ever 6DOF processing example of a teleseismic earthquake recorded on a multicomponent ring laser observatory and demonstrate how wave parameters (phase velocity, propagation direction, and ellipticity angle) and wave types of multiple phases can be automatically estimated using single-station 6DOF processing tools. Python codes to reproduce this processing example are provided in an accompanying Jupyter notebook.

show abstract

“…The large ring laser “G” located at the Geodetic Observatory Wettzell started to record the polar motion in 2010, and the results are consistent with the data provided by the International Earth Rotation and Reference Systems Service (IERS), which is obtained from the space geodetic techniques [ 4 , 22 , 23 ]. The full Earth rotation vector is already provided by a ring laser array and it is also getting close to the detection of the length of day (LoD) fluctuations by using this type of inertial sensing technique [ 24 , 25 ]. Recording the universal time (UT1) data in hourly temporal resolution would be a major supplement to the space geodetic observations that are used to determine the Earth orientation parameters (EOP) [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Noise Analysis of a Passive Resonant Laser Gyroscope

Liu

Zhang

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

Large-scale laser gyroscopes have found important applications in Earth sciences due to their self-sufficient property of measurement of the Earth’s rotation without any external references. In order to extend the relative rotation measurement accuracy to a better level so that it can be used for the determination of the Earth orientation parameters (EOP), we investigate the limitations in a passive resonant laser gyroscope (PRG) developed at Huazhong University of Science and Technology (HUST) to pave the way for future development. We identify the noise sources from the derived noise transfer function of the PRG. In the frequency range below 10−2Hz, the contribution of free-spectral-range (FSR) variation is the dominant limitation, which comes from the drift of the ring cavity length. In the 10−2 to 103Hz frequency range, the limitation is due to the noises of the frequency discrimination system, which mainly comes from the residual amplitude modulation (RAM) in the frequency range below 2 Hz. In addition, the noise contributed by the Mach–Zehnder-type beam combiner is also noticeable in the 0.01 to 2 Hz frequency range. Finally, possible schemes for future improvement are also discussed.

show abstract

Reconstruction of the Instantaneous Earth Rotation Vector with Sub-Arcsecond Resolution Using a Large Scale Ring Laser Array

Cited by 42 publications

References 12 publications

ROMY: A Multi-Component Ring Laser for Geodesy and Geophysics

ROMY: A Multi-Component Ring Laser for Geodesy and Geophysics

Seismological Processing of Six Degree-of-Freedom Ground-Motion Data

Noise Analysis of a Passive Resonant Laser Gyroscope

Contact Info

Product

Resources

About