Ring Laser Gyroscopes as Rotation Sensors for Seismic Wave Studies

Schreiber, K. U.; Stedman, Geoffrey; Igel, Heiner; Flaws, A.

doi:10.1007/3-540-31337-0_29

Cited by 58 publications

(31 citation statements)

References 10 publications

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“…Then the analysis proceeds along the lines used by Cochard et al (2006) and Igel et al (2005Igel et al ( , 2007 in their pioneering effort with the ring laser angular motion sensors developed by Schreiber et al (2006). It is expected that this new robust instrument will be compact enough to be mounted on test facilities being developed by the USGS scientists for absolute calibrations.…”

Section: Response Function Of the Instrument To Periodic Signalsmentioning

confidence: 97%

Performance Characteristics of a Rotational Seismometer for Near-Field and Engineering Applications

Cowsik¹,

Madziwa-Nussinov²,

Wagoner³

et al. 2009

Bulletin of the Seismological Society of America

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Based on the concept that torsion balances act as good filters for rotational oscillations at frequencies above their natural frequency of oscillations, we have fabricated a simple prototype to serve as a rotational seismometer for near-field and engineering studies. This instrument displays a nearly flat response at frequencies above 10 mHz, and the preliminary data taken with this instrument show a sensitivity of 5 × 10 6 ν=0:01 Hz rad sec 1 Hz 1=2 . Marginal improvements of the fabrication and housing will be needed to fully cover the sensitivities recommended by a U.S. Geological Survey (USGS) panel for studies at these frequencies.

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Section: Response Function Of the Instrument To Periodic Signalsmentioning

confidence: 97%

Performance Characteristics of a Rotational Seismometer for Near-Field and Engineering Applications

Cowsik¹,

Madziwa-Nussinov²,

Wagoner³

et al. 2009

Bulletin of the Seismological Society of America

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“…However, the first directly recorded rotation motions are those obtained at the two fundamental geodetic stations in Germany (Wetzell) and in Australia at the end of the last century (e.g., Igel et al, 2005;Cochard et al, 2006;Schreiber et al, 2006;Igel et al, 2007) equipped with ring-laser interferometers based on the Sagnac principle. These systems, having sensitivity up to 10 9 rad=sec, were able to record the rotation motions related even to many distant earthquakes.…”

Section: Conclusion and Experimental Evidencementioning

confidence: 98%

Fundamental Deformations in Asymmetric Continuum

Teisseyre

Górski

2009

Bulletin of the Seismological Society of America

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The complexity of processes in a seismic source zone has inspired us to reconsider a class of basic motions and deformations in an asymmetric continuum, including simple motions (translation and rotation, named spin) and simple deformations. Simple deformations include the axial nuclei, that is, point extension/ compression, and the shear nuclei related to string-string point deformations. The point deformation is further redefined as another kind of rotational motion, called twist, representing oscillations of the main shear axes and their amplitudes. Some remarks are added on the recording systems used to measure these motions and deformations.

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“…Observation of seismically induced rotational ground motions is becoming increasingly feasible and reliable thanks to recent developments of high-precision rotation sensors ͑e.g., Schreiber et al, 2006. Several authors report rotations excited by teleseismic waves ͑e.g., Pancha et al, 2000;Igel et al, 2005Igel et al, , 2007Cochard et al, 2006͒.…”

Section: Introductionmentioning

confidence: 97%

Inferring earth structure from combined measurements of rotational and translational ground motions

2009

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We introduce a novel variant of seismic tomography that is based on colocated measurements of rotational and translational ground motions. Our aim is to assess whether rotations may be incorporated successfully into seismic inverse problems to produce better resolved and more realistic tomographic images. Our methodology is based on the definition of apparent S-wave speed as the ratio of rms velocity and rotation amplitudes. The principal advantages of this definition are that ͑1͒ no traveltimes measurements are needed and ͑2͒ the apparent S-wave speed is independent of source magnitude and source timing. We derive finite-frequency kernels for apparent S-wave speed by using a combination of the adjoint method and ray approximation. The properties of these kernels as a function of frequency bandwidth can be illustrated along with their usefulness for seismic tomography. In multifrequency synthetic inversions, we consider local crosshole tomography and regional-scale earthquake tomography.Our results indicate that S-wave speed variations can be retrieved accurately from colocated rotation and translation measurements, suggesting that our methodology is a promising extension of conventional seismic tomography. Further, apparent S-wave speed can be used to increase vertical resolution in teleseismic tomography for local structures.

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Ring Laser Gyroscopes as Rotation Sensors for Seismic Wave Studies

Cited by 58 publications

References 10 publications

Performance Characteristics of a Rotational Seismometer for Near-Field and Engineering Applications

Performance Characteristics of a Rotational Seismometer for Near-Field and Engineering Applications

Fundamental Deformations in Asymmetric Continuum

Inferring earth structure from combined measurements of rotational and translational ground motions

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